Earthquakes Safety

Earthquakes are a typical event, thundering beneath Earth's surface thousands of times each day. In any case, significant seismic tremors are less normal. Here are a few activities to plan for a seismic tremor and what to do once the ground begins shaking.

Safety Tips

• Have an earthquake readiness plan.

• Consult an expert to figure out how to make your home sturdier, for example, blasting cabinets to divider studs, introducing solid locks on pantries, and lashing the water radiator to divider studs. 

• Locate a place in each room of the house that you can go to if there should arise an occurrence of a seismic tremor. It ought to be where nothing is probably going to fall on you, similar to a door jamb.

• Keep a supply of canned sustenance, a progressive emergency treatment unit, 3 gallons (11.4 liters) of water per individual, dust covers and goggles, and a working battery-worked radio and electric lamps in an available place.
 •Know how to turn off your gas and water mains.


In the case of Shaking Begins

• Drop down; seek shelter under a work area or table and hang on.

• Stay inside until the point when the shaking stops and you're certain it's protected to exit.

• Stay far from cabinets or furniture that can fall on you.• Consult an expert to figure out how to make your home sturdier, for example, shooting shelves to divider studs, introducing solid hooks on pantries, and lashing the water warmer to divider studs.

• Locate a place in each room of the house that you can go to if there should be an occurrence of a seismic tremor. It ought to be where nothing is probably going to fall on you, similar to a door jamb.

• Keep a supply of canned sustenance, an up and coming medical aid pack, 3 gallons (11.4 liters) of water per individual, dust veils and goggles, and a working battery-worked radio and spotlights in an available place.

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Earthquake! & Its Reason.

A quake (otherwise called a shudder, tremor or earthquake) is the shaking of the surface of the Earth, coming about because of the sudden arrival of vitality in the World's lithosphere that makes seismic waves. Quakes can run in estimate from those that are weak to the point that they can't be felt to those sufficiently brutal to hurl individuals around and devastate entire urban areas. The seismicity, or seismic movement, of a territory is the recurrence, sort and size of tremors experienced over some stretch of time. The word tremor is additionally utilized for non-quake seismic thundering.

At the World's surface, seismic tremors show themselves by shaking and uprooting or upsetting the ground. At the point when the epicenter of a huge seismic tremor is found seaward, the seabed might be dislodged adequately to cause a torrent. Tremors can likewise trigger avalanches, and once in a while volcanic action.

In its most broad sense, the word quake is utilized to portray any seismic occasion — whether regular or caused by people — that creates seismic waves. Seismic tremors are caused generally by crack of topographical shortcomings, yet additionally by different occasions, for example, volcanic action, avalanches, mine impacts, and atomic tests. A seismic tremor's purpose of beginning crack is called its concentration or hypocenter. The epicenter is the point at ground level specifically over the hypocenter.

A Structural seismic tremors happen anyplace in the earth where there is adequate put away flexible strain vitality to drive crack proliferation along a blame plane. The sides of a blame move past each other easily and aseismically just if there are no inconsistencies or ill tempers along the blame surface that expansion the frictional opposition. Most blame surfaces do have such severities and this prompts a type of stick-slip conduct. Once the blame has bolted, proceeded with relative movement between the plates prompts expanding pressure and in this manner, put away strain vitality in the volume around the blame surface. This proceeds until the point when the pressure has risen adequately to get through the ill temper, abruptly permitting sliding over the bolted segment of the blame, discharging the put away energy.[1] This vitality is discharged as a blend of emanated flexible strain seismic waves, frictional warming of the blame surface, and splitting of the stone, along these lines causing a tremor. This procedure of slow develop of strain and stress punctuated by intermittent sudden seismic tremor disappointment is alluded to as the versatile bounce back hypothesis. It is assessed that lone 10 percent or less of a tremor's aggregate vitality is emanated as seismic vitality. The vast majority of the seismic tremor's vitality is utilized to control the quake break development or is changed over into warm produced by grating. Subsequently, seismic tremors bring down the World's accessible versatile potential vitality and raise its temperature, however these progressions are unimportant contrasted with the conductive and convective stream of warmth out from the World's profound inside.

Seismic tremor blame composes

Principle article: Blame (geography)

There are three primary sorts of blame, all of which may cause an interplate quake: typical, invert (push) and strike-slip. Ordinary and switch blaming are cases of plunge slip, where the relocation along the blame is toward plunge and development on them includes a vertical part. Ordinary flaws happen for the most part in regions where the outside layer is being broadened, for example, a different limit. Invert flaws happen in zones where the outside layer is being abbreviated, for example, at a focalized limit. Strike-slip issues are steep structures where the two sides of the blame slip on a level plane past each other; change limits are a specific sort of strike-slip blame. Numerous tremors are caused by development on shortcomings that have segments of both plunge slip and strike-slip; this is known as angled slip.

Switch deficiencies, especially those along united plate limits are related with the most ground-breaking quakes, megathrust seismic tremors, including those of size at least 8. Strike-slip deficiencies, especially mainland changes, can create significant seismic tremors up to about extent 8. Seismic tremors related with ordinary shortcomings are for the most part not as much as extent 7. For each unit increment in extent, there is an about thirtyfold increment in the vitality discharged. For example, a seismic tremor of greatness 6.0 discharges around 30 times more vitality than a 5.0 extent quake and a 7.0 size tremor discharges 900 times (30 × 30) more vitality than a 5.0 size of quake. A 8.6 size seismic tremor discharges an indistinguishable measure of vitality from 10,000 nuclear bombs like those utilized in World War II.
This is so in light of the fact that the vitality discharged in a tremor, and therefore its size, is corresponding to the zone of the blame that ruptures and the pressure drop. In this way, the more drawn out the length and the more extensive the width of the blamed region, the bigger the subsequent extent. The highest, fragile piece of the World's outside, and the cool sections of the structural plates that are plummeting down into the hot mantle, are the main parts of our planet which can store flexible vitality and discharge it in blame bursts. Rocks more sultry than around 300 degrees Celsius stream because of stress; they don't burst in earthquakes.The most extreme watched lengths of cracks and mapped issues (which may break in a solitary burst) are roughly 1000 km. Illustrations are the seismic tremors in Chile, 1960; Gold country, 1957; Sumatra, 2004, all in subduction zones. The longest quake breaks on strike-slip issues, similar to the San Andreas Blame (1857, 1906), the North Anatolian Blame in Turkey (1939) and the Denali Blame in The Frozen North (2002), are about half to 33% as long as the lengths along subducting plate edges, and those along ordinary issues are considerably shorter.
The most critical parameter controlling the greatest seismic tremor extent on a blame is anyway not the most extreme accessible length, but rather the accessible width on the grounds that the last shifts by a factor of 20. Along uniting plate edges, the plunge edge of the crack plane is extremely shallow, ordinarily around 10 degrees.[7] Accordingly the width of the plane inside the best weak outside layer of the Earth can progress toward becoming 50 to 100 km (Japan, 2011; Gold country, 1964), making the most great quakes conceivable.

Strike-slip issues have a tendency to be situated close vertically, bringing about an estimated width of 10 km inside the fragile crust,[8] accordingly seismic tremors with extents significantly bigger than 8 are impractical. Most extreme sizes along numerous typical deficiencies are much more restricted on the grounds that huge numbers of them are situated along spreading focuses, as in Iceland, where the thickness of the fragile layer is just around 6 km.[9][10]

Furthermore, there exists a progressive system of feeling of anxiety in the three blame composes. Push issues are produced by the most astounding, strike sneak past middle of the road, and ordinary blames by the least pressure levels.[11] This can undoubtedly be comprehended by considering the bearing of the best key pressure, the course of the power that 'pushes' the stone mass amid the blaming. On account of typical deficiencies, the stone mass is pushed down in a vertical course, accordingly the pushing power (most prominent key pressure) rises to the heaviness of the stone mass itself. On account of pushing, the stone mass 'breaks' toward the minimum main pressure, to be specific upward, lifting the stone mass up, along these lines the overburden parallels the slightest central pressure. Strike-slip blaming is moderate between the other two composes depicted previously. This distinction in push administration in the three blaming conditions can add to contrasts in pressure drop amid blaming, which adds to contrasts in the transmitted vitality, paying little heed to blame measurements.

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What is Wildfire? How harmful is it?

A rapidly spreading fire or wildland fire is a fire in a territory of burnable vegetation that happens in the field or rustic zone. Contingent upon the kind of vegetation where it happens, a rapidly spreading fire can likewise be ordered all the more particularly as a wildfire, bramble fire, desert fire, timberland fire, grass fire, slope fire, peat fire, vegetation fire, and veld fire. 

Fossil charcoal shows that fierce blazes started not long after the presence of earthbound plants 420 million years prior. Out of control fire's event all through the historical backdrop of earthly life welcomes guess that fire probably had articulated transformative impacts on most biological communities' widely varied vegetation. Earth is a naturally combustible planet attributable to its front of carbon-rich vegetation, occasionally dry atmospheres, barometrical oxygen, and across the board lightning and volcanic starts. 

Fierce blazes can be portrayed as far as the reason for start, their physical properties, the burnable material present, and the impact of climate on the fire. Out of control fires can make harm property and human life, yet they have numerous useful consequences for local vegetation, creatures, and biological communities that have advanced with flame. High-seriousness rapidly spreading fire makes complex early seral backwoods environment (additionally called "catch woods living space"), which regularly has higher species extravagance and decent variety than unburned old woodland. Many plant species rely upon the impacts of flame for development and proliferation. In any case, rapidly spreading fire in biological systems where fierce blaze is exceptional or where non-local vegetation has infringed may have negative environmental impacts. Rapidly spreading fire conduct and seriousness result from the mix of components, for example, accessible powers, physical setting, and climate. Investigations of verifiable meteorological information and national fire records in western North America demonstrate the supremacy of atmosphere in driving expansive territorial flames through wet periods that make generous fills or dry season and warming that expand helpful fire climate. 

Techniques of out of control fire avoidance, discovery, and concealment have changed throughout the years. One normal and economical system is controlled consuming: allowing or notwithstanding lighting littler flames to limit the measure of combustible material accessible for a potential rapidly spreading fire. Vegetation might be scorched intermittently to keep up high species decent variety and incessant consuming of surface fills limits fuel accumulation.Wildland fire utilize is the least expensive and most environmentally suitable arrangement for some woodlands. Energizes may likewise be evacuated by logging, yet fills medications and diminishing have no impact on serious fire conduct when under outrageous climate conditions. Out of control fire itself is supposedly "the best treatment for lessening a fire's rate of spread, fireline force, fire length, and warmth per unit of region" as indicated by Jan Van Wagtendonk, a researcher at the Yellowstone Field Station. Construction standards in flame inclined territories normally necessitate that structures be worked of fire safe materials and a solid space be kept up by clearing combustible materials inside a recommended separate from the structure.

Three noteworthy normal reasons for rapidly spreading fire starts exist 

dry atmosphere 

lightning 

volcanic ejection 

The most widely recognized direct human reasons for fierce blaze start incorporate incendiarism, disposed of cigarettes, control line circular segments (as identified by bend mapping), and starts from equipment. Start of wildland shoot through contact with hot rifle-shot parts is additionally conceivable under the privilege conditions. Rapidly spreading fires can likewise be begun in networks encountering moving development, where arrive is cleared rapidly and cultivated until the point that the dirt loses ripeness, and slice and consume clearing. Forested regions cleared by logging energize the predominance of combustible grasses, and surrendered logging streets congested by vegetation may go about as discharge passageways. Yearly field fires in southern Vietnam stem to a limited extent from the annihilation of forested regions by US military herbicides, explosives, and mechanical land-clearing and - consuming tasks amid the Vietnam War. 

The most widely recognized reason for fierce blazes shifts all through the world. In Canada and northwest China, lightning works as the real wellspring of start. In different parts of the world, human inclusion is a noteworthy supporter. In Africa, Focal America, Fiji, Mexico, New Zealand, South America, and Southeast Asia, out of control fires can be ascribed to human exercises, for example, agribusiness, creature farming, and land-change consuming. In China and in the Mediterranean Bowl, human recklessness is a noteworthy reason for wildfires. In the Assembled States and Australia, the wellspring of out of control fires can be followed both to lightning strikes and to human exercises, (for example, apparatus sparkles, cast-away cigarette butts, or arson). Coal crease fires consume in the thousands around the globe, for example, those in Consuming Mountain, New South Grains; Centralia, Pennsylvania; and a few coal-supported flames in China. They can likewise erupt surprisingly and touch off close-by combustible material.











The spread of fierce blazes changes in light of the combustible material present, its vertical game plan and dampness substance, and climate conditions. Fuel game plan and thickness is represented to a limited extent by geology, as land shape decides factors, for example, accessible daylight and water for plant development. By and large, fire writes can be for the most part portrayed by their fills as takes after: 

Ground fires are nourished by underground roots, duff and other covered natural issue. This fuel write is particularly vulnerable to start because of spotting. Ground fires regularly consume by seething, and can consume gradually for a considerable length of time to months, for example, peat fires in Kalimantan and Eastern Sumatra, Indonesia, which came about because of a riceland creation venture that unexpectedly depleted and dried the peat. 

Creeping or surface flames are powered by low-lying vegetation on the woods floor, for example, leaf and timber litter, flotsam and jetsam, grass, and low-lying greenery. This sort of flame regularly consumes at a generally bring down temperature than crown fires (under 400 °C (752 °F)) and may spread at moderate rate, however soak inclines and wind can quicken the rate of spread. 

Stepping stool fires devour material between low-level vegetation and tree shelters, for example, little trees, brought down logs, and vines. Kudzu, Old World climbing greenery, and other intrusive plants that scale trees may likewise empower stepping stool fires. 

Crown, shade, or ethereal flames consume suspended material at the shelter level, for example, tall trees, vines, and greeneries. The start of a crown fire, named delegated, is reliant on the thickness of the suspended material, shade tallness, shelter coherence, adequate surface and stepping stool fires, vegetation dampness substance, and climate conditions amid the burst. Stand-supplanting fires lit by people can spread into the Amazon rain woods, harming biological systems not especially suited for warm or dry conditions.









Warmth waves, dry seasons, recurrent atmosphere changes, for example, El Niño, and local climate examples, for example, high-weight edges can expand the hazard and adjust the conduct of out of control fires drastically. Long stretches of precipitation taken after by warm periods can support more across the board flames and longer fire seasons. Since the mid-1980s, prior snowmelt and related warming has likewise been related with an expansion long and seriousness of the fierce blaze season in the Western Joined States. A worldwide temperature alteration may expand the power and recurrence of dry spells in numerous zones, making more serious and incessant rapidly spreading fires. A recent report shows that the expansion in flame hazard in California might be inferable from human-prompted environmental change. An investigation of alluvial silt stores returning more than 8,000 years discovered hotter atmosphere periods experienced serious dry spells and stand-supplanting fires and finished up atmosphere was such a great impact on rapidly spreading fire that endeavoring to reproduce presettlement woods structure is likely unimaginable in a hotter future. 

Force additionally increments amid daytime hours. Consume rates of seething logs are up to five times more noteworthy amid the day because of lower stickiness, expanded temperatures, and expanded breeze speeds. Daylight warms the ground amid the day which makes air streams that movement tough. Around evening time the land cools, making air streams that movement downhill. Fierce blazes are fanned by these breezes and frequently take after the air streams over slopes and through valleys. Flames in Europe happen every now and again amid the long periods of 12:00 p.m. furthermore, 2:00 p.m. Out of control fire concealment activities in the Unified States spin around a 24-hour fire day that starts at 10:00 a.m. because of the anticipated increment in force coming about because of the daytime warmth.

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What is the defination of Storm's Signs in Bangladesh?

Storm Cautioning Signs In Bangladesh

Storm by and large happen in Bangladesh in the long periods of April-May and October-November.

The Meterological Division utilizes isolate codes of signs for storm admonitions at sea and waterway ports. These codes are given underneath in condensed shapes.

It ought to be noticed that the flag numbers in the two codes don't convey a similar essentialness and, specifically, that higher flag numbers inside the threat and extraordinary peril oceanic gatherings demonstrate contrasts in storm area not distinction in strom power.

Storm cautioning signals for use at oceanic ports.

a) Removed signs:

1. Preventative. There is a locale of squally climate in which a tempest might be shaped.

2. Cautioning A strom has shaped.

b) Neighborhood signals:

3. Preventative Port is debilitated by squally climate.

4. Caution. Port is debilitated by a tempest, however peril not yet adequately incredible to legitimize extraordinary careful steps. 

5-7 Risk Port will encounter serious climate from a tempest of slight or direct power.

5. Tempest anticipated that would cross the drift toward the south of the port.

6. Tempest anticipated that would cross the drift toward the north of the port.

7. Tempest expected over or close to the port.

8-10 Incredible risk. Port will encounter serious climate from a tempest of extraordinary power.

8. Storm anticipated that would cross the drift toward the south of the port. 

9. Storm anticipated that would cross the drift toward the north of the port.

10. Storm expected over or close to the port.

Disappointment of correspondence. Correspondences with the Meteorological Cautioning Center have separated and the neighborhood officer thinks about that there is peril of awful climate.

Tempest Cautioning Signs For Use At Waterway Ports:

1. Preventative. Territory debilitated by squally breezes. Pay special mind to facilitate improvements.

2. Caution. A tempest or nor-wester is probably going to strike the region.

3. Peril A tempest will before long strike the territory. All vessels look for protect instantly.

4. Incredible threat A fierce tempest will before long strike the region.

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Major Cyclones happened in Bangladesh

Sequence of major cyclonic tempests

1584 Bakerganj (by and by Barisal) and Patuakhali; typhoon with thunder and helping proceeded for five hours; the houses and water crafts were gobbled up, leaving just Hindu sanctuaries on a tallness; around 2,000,000 living animals died.
1585 Mouth of the Meghna estuary; extreme tempest wave cleared up the eastern side of Bakerganj; number of living animals died, standing harvests obliterated.

1797 (November) Chittagong; extreme cyclonic tempest; each cabin leveled to the ground and 2 vessels soaked in chittagong port.

1822 (May) Barisal, Hatiya Island and Noakhali region; extreme cyclonic tempest with storm wave; Collectorate records cleared away, 40,000 individuals slaughtered and 100,000 cows lost.

1831 (October) Barisal; storm-wave; numerous lives lost and cows wrecked (correct figures not accessible).

1872 (October) Cox's Bazar; cyclonic tempest; correct figures of the loss of lives and dairy cattle are not accessible.

1876 (31 October) Meghna estuary and shores of Chittagong, Barisal, Noakhali; most extreme tempest flood of around 12.2m (40 ft) stature; around 200,000 individuals passed on amid the tempest, however maybe more individuals kicked the bucket from the eventual outcomes of the tempest, for example, plague and starvation, and gigantic properties pulverized by tidal bore. Thinking about the populace around then, a demise figure of 200,000 was for sure too substantial.

1897 (24 October) Chittagong; typhoon achieved most extreme force with arrangement of tempest waves; Kutubdia Island and seaside towns were cleared more than, 14,000 individuals murdered and 18,000 passed on in pandemics (cholera) that took after.

1898 (May) Teknaf; cyclonic tempest waves; correct figures of harm not accessible.

1904 (November) Sonadia; cyclonic tempest; 143 slaughtered and angling armada destroyed.

1909 (16 October) Khulna; cyclonic tempest waves; slaughtered 698 individuals and 70,654 steers.

1913 (October) Muktagachha upazila (Mymensingh); cyclonic tempest; annihilated numerous towns murdering around 500 people.

1917 (24 September) Khulna; typhoon; 432 people slaughtered and 28,029 dairy cattle lost.

1941 (May) Eastern Meghna estuary; cyclonic tempest with storm-wave; correct figures of the loss of lives and cows aer not accessible.

1942 (October) sundarbans; extreme cyclonic tempest; number of human lives, correct figures of the loss of untamed life and vessels are not accessible.

1948 (17-19 May) Amongst Chittagong and Noakhali; cyclonic tempest; around 1,200 people murdered and 20,000 dairy cattle lost.

1958 (16-19 May) East and west Meghna estuary, east of Barisal, Noakhali; cyclonic tempest alongside flood; 870 people executed, 14,500 dairy cattle lost and standing yields wrecked.

1958 (21-24 October) Chittagong drift; cyclonic tempest; around 100,000 families lost their homes and government needed to give house-building credits.

1960 (9-10 October) Eastern Meghna estuary (Noakhali, Bakerganj, Faridpur and Patuakhali); extreme cyclonic tempest, most extreme breeze speed 201 km/hr, greatest tempest wave 3.05m; impressive harm to Roast Jabbar, Singe Amina, Burn Bhatia, Ramgati, Hatiya and Noakhali; 3,000 lives lost, 62,725 houses harmed, trims on 94,000 sections of land of land were completely harmed and a huge number of steers died.

1960 (30-31 October) Chittagong, Noakhali, Bakerganj, Faridpur, Patuakhali and eastern Meghna estuary; extreme cyclonic tempest, greatest breeze speed 210 km/hr, flood tallness 4.5-6.1m; around 10,000 people slaughtered, 27,793 cows lost and 568,161 houses annihilated (particularly 70% of houses in Hatiya passed over), two extensive sea liners washed shorewards, 5-7 vessels upset in Karnafuli waterway. 

1961 (9 May) Bagerhat and Khulna; extreme cyclonic tempest with a breeze speed of 161 km/hr, flood 2.44-3.05m; rail track amongst Noakhali and Harinarayanpur harmed, overwhelming death toll in Burn Alexander, 11,468 individuals executed and around 25,000 cattlehead crushed.

1962 (26-30 October) Feni; serious cyclonic tempest with a breeze speed of 161 km/hr, flood 2.5-3.0m; substantial death toll; around 1,000 individuals kicked the bucket and numerous local dairy cattle died.

1963 (28-29 May) Chittagong, Noakhali, Cox's Bazar and the seaward islands of Sandwip, Kutubdia, Hatiya and Maheshkhali were gravely influenced; serious cyclonic tempest with storm-wave rising 4.3-5.2m in Chittagong, most extreme breeze speed 203 km/hr and at Cox's Bazar 164 km/hr; in excess of 11,520 individuals executed, 32,617 cows lost, 376,332 houses, 4,787 water crafts and standing products devastated.

1965 (11-12 May) Barisal and Bakerganj; most extreme cyclonic tempest, greatest speed 162 km/hr with storm-wave rising 3.7m; add up to death toll 19,279; in Barisal alone 16,456 individuals slaughtered.

1965 (14-15 December) Cox's Bazar alongside adjoining beach front zone and Patuakhali; serious cyclonic tempest with storm-wave rising 4.7-6.1m; most extreme speed 210 km/hr in Cox's Bazar, lifted risk flag 10 at Cox's Bazar and along the bank of Sonadia, Rangadia and Hamidia islands, and Patuakhali; 40,000 salt beds in Cox's Bazar immersed and 873 individuals slaughtered.

1966 (1 October) Sandwip, Bakerganj, Khulna, Chittagong, Noakhali and Comilla; serious cyclonic tempest with storm-floods of 4.7-9.1m, most extreme breeze speed 146 km/hr; influenced 1.5 million individuals, loss of human life and domesticated animals were 850 and 65,000 separately in Noakhali and Bakerganj.

1969 (14 April) Demra (Dhaka region); tornado privately known as Kalbaishakhi with twist speed of 643 km/hr; 922 individuals murdered and 16,511 harmed; assessed misfortune Tk 40 to 50 million.

1970 (12-13 November) The most dangerous and destroying cyclonic tempest that caused the most astounding setback ever of. Chittagong was battered by sea tempest winds. It likewise hit Barguna, Khepupara, Patuakhali, north of Scorch Burhanuddin, Singe Tazumuddin and south of Maijdi, Haringhata and caused substantial loss of lives and harm to yields and property. Formally the demise figure was put at 500,000 yet it could be more. An aggregate of 38,000 marine and 77,000 inland anglers were influenced by the twister. It was evaluated that approximately 46,000 inland anglers working in the typhoon influenced area lost their lives. In excess of 20,000 angling pontoons were pulverized; the harm to property and products was gigantic. More than one million cattlehead were accounted for lost. In excess of 400,000 houses and 3,500 instructive organizations were harmed. The most extreme recorded breeze speed of the 1970 violent wind was around 222 km/hr and the greatest tempest flood stature was around 10.6m and the twister happened amid high-tide. 

1971 (5-6 November) Chittagong drift; extreme cyclonic tempest; correct figures of the loss of lives and cows are not accessible

1971 (28-30 November) Sundarban drift; cyclonic tempest with a breeze speed of 97-113 km/hr and tempest flood of under 1m; Khulna locale experienced stormy climate and low lying regions of Khulna town immersed.

1973 (6-9 December) Sundarban drift; serious cyclonic tempest joined by storm flood; low-lying beach front regions of Patuakhali and bordering seaward islands immersed.

1974 (13-15 August) Khulna; cyclonic tempest with a breeze speed of 80.5 km/hr; around 600 lives lost and number of cattlehead decimated.

1974 (24-28 November) Beach front belt from Cox's Bazar to Chittagong and seaward islands; extreme cyclonic tempest with a breeze speed of 161 km/hr and tempest flood of 2.8-5.2 m; 200 individuals slaughtered, 1000 cows lost and 2,300 houses died.

1975 (9-12 May) Bhola, Cox's Bazar and Khulna; serious cyclonic tempest with a breeze speed of 96.5 to 112.6 km/hr; 5 people murdered and various anglers missing.

1977 (9-12 May) Khulna, Noakhali, Patuakhali, Barisal, Chittagong and seaward islands; cyclonic tempest with a breeze speed of 112.63 km/hr; correct figures of the loss of lives and cows are not accessible.

1983 (14-15 October) Seaward islands and roasts of Chittagong and Noakhali; extreme cyclonic tempest with a breeze speed of 122 km/hr; 43 people murdered, 6 angling water crafts and a trawler lost, in excess of 150 anglers and 100 angling vessels absent and 20% aman crops pulverized.

1983 (5-9 November) Chittagong, Cox's Bazar drift close Kutubdia and the low lying regions of St Martin's Island, Teknaf, Ukhia, Moipong, Sonadia, Barisal, Patuakhali and Noakhali; extreme cyclonic tempest (tropical storm) with a breeze speed of 136 km/hr and a tempest flood of 1.52m stature; 300 anglers with 50 water crafts absent and 2,000 houses decimated.

1985 (24-25 May) Chittagong, Cox's Bazar, Noakhali and their seaward islands (Sandwip, Hatiya, and Urirchar); extreme cyclonic tempest, wind speed Chittagong 154 km/hr, Sandwip 140 km/hr, Cox's Bazar 100 km/hr and tempest flood of 3.0-4.6m; around 11,069 people executed, 94,379 houses harmed, domesticated animals lost 135,033 and street harmed 74 km, dikes harmed.

1986 (8-9 November) Seaward island and burns of Chittagong, Barisal, Patuakhali and Noakhali; cyclonic tempest hit 110 km/hr at Chittagong and 90/hr at Khulna; 14 people executed, harmed 97,200 ha of paddy fields, harm to schools, mosques, distribution centers, healing centers, houses and structures at Amtali upazila in Barguna.

1988 (24-30 November) Jessore, Kushtia, Faridpur, seaward islands and roasts of Barisal and Khulna; serious cyclonic tempest with center breeze speed 162 km/hr, storm flood of 4.5m at Mongla point; slaughtered 5,708 people and part of wild creatures - deer 15,000, Illustrious Bengal Tiger 9, dairy cattle 65,000 and crops harmed worth about Tk 9.41 billion.

1991 (29 April) The Incomparable Violent wind of 1991, crossed the Bangladesh drift amid the night. It began in the Pacific around 6,000 km away and took 20 days to achieve the bank of Bangladesh. It had a measurement of more than the span of Bangladesh. The focal cloudy cloud had a distance across surpassing 600 km. The most extreme breeze speed saw at Sandwip was 225 km/hr. The breeze speeds recorded at better places were as per the following: Chittagong 160 km/hr, Khepupara (Kalapara) 180 km/hr, Kutubdia 180 km/hr, Cox's Bazar 185 km/hr, and Bhola 178 km/hr. The greatest breeze speed assessed from NOAA-11 satellite picture got at 13:38 hours on 29 April was around 240 km/hr. The violent wind was recognized as a misery (wind speed not surpassing 62 km/hr) on the 23rd April first in the satellite picture taken at SPARRSO from NOAA-11 and GMS-4 satellites. It transformed into a cyclonic tempest on 25 April. The tornado in its underlying stage moved somewhat northwest and afterward north. From 28 April it began moving in a north-easterly bearing and crossed the Bangladesh drift north of Chittagong port amid the evening of the 29th April. The violent wind began influencing the beach front islands like Nijhum Dwip, Manpura, Bhola and Sandwip from the night of that day. The most extreme tempest flood tallness amid this tornado was assessed to be around 5 to 8m. The death toll and property was titanic. The loss of property was evaluated at Tk 60 billion. The loss of life was assessed at 150,000; cattlehead slaughtered 70,000.

1991 (31 May to 2 June) Seaward islands and scorches of Patuakhali, Barisal, Noakhali and Chittagong; cyclonic tempest, most extreme breeze speed 110 km/hr and flood tallness of 1.9m; individuals murdered, cattlehead died, vessels lost and standing products pulverized.

1994 (29 April 3 May) Seaward island and scorches of Cox's Bazar; serious cyclonic tempest with most extreme breeze speed of 210 km/hr; individuals executed around 400, steers lost around 8,000.

1995 (21-25 November) Seaward island and singes of Cox's Bazar; serious cyclonic tempest with greatest breeze speed of 210 km/hr; around 650 individuals slaughtered, 17,000 cattlehead died.

1997 (16-19 May) Seaward islands and scorches of Chittagong, Cox's Bazar, Noakhali and Bhola; serious cyclonic tempest (tropical storm) with a breeze speed of 225 km/hr, storm flood of 3.05m (comparable quality to that of 1970 tornado); just 126 individuals slaughtered due to better fiasco administration measures taken by the legislature and the general population.

1997 (25-27 September) Seaward islands and singes of Chittagong, Cox's Bazar, Noakhali and Bhola; serious cyclonic tempest (sea tempest) with a breeze speed of 150 km/hr, storm flood of 1.83 to 3.05m.

1998 (16-20 May) Seaward islands and singes of Chittagong, Cox's Bazar and Noakhali; extreme cyclonic tempest (sea tempest) with a breeze speed of 150 km/hr, storm flood of 1.83 to 2.44m.

1998 (19-22 November) Seaward islands and roasts of Khulna, Barisal and Patuakhali; cyclonic tempest with most extreme breeze speed of 90 km/hr, storm flood of 1.22 to 2.44m.

2007 (15-17 November) Serious cyclonic tempest 'Sidr' causes gigantic harm in southern piece of Bangladesh; around 3000 people slaughtered.

2009 (19-21 April) Violent wind 'Bijli' assaulted pitifully in Bangladesh and not all that extreme harms were recorded with the exception of a few houses and harvest fields misfortunes.

2009 (27-29 May) A serious cyclonic tempest 'Aila' assaulted seaward 15 areas of south-western piece of Bangladesh;' around 150 people executed, 2 lac houses and 3 lac sections of land of developed land and products misfortunes.

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What is Natural Disaster?

A catastrophic event is a noteworthy unfriendly occasion coming about because of characteristic procedures of the Earth; illustrations are surges, sea tempests, tornadoes, volcanic ejections, seismic tremors, waves, and other geologic procedures. A catastrophic event can cause death toll or property harm, and ordinarily abandons some financial harm afterward, the seriousness of which relies upon the influenced populace's versatility, or capacity to recoup and furthermore on the foundation accessible. 

An unfavorable occasion won't ascend to the level of a fiasco on the off chance that it happens in a territory without defenseless populace. In a helpless zone, in any case, for example, Nepal amid the 2015 tremor, a quake can have shocking outcomes and leave enduring harm, which can expect a long time to repair.

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