Earthquake Paragraph

An earthquake is a sudden shaking of the earth's surface caused by the movement of rock along a fault.

Tip: choose the version whose length matches your exam — the shorter editions (150–250 words) suit PSC, JSC and SSC, while SSC, HSC and university-admission answers often call for 300–1000 words.

Earthquake Paragraph (150 Words)

An earthquake is a sudden shaking of the earth's surface caused by the movement of rock beneath it. The outer shell of the earth is broken into large plates that press against one another, and when the strain becomes too great the rock slips along a fracture called a fault. The energy released travels outward as waves, and it is these waves that we feel as shaking. The point underground where the slip begins is the focus, and the place on the surface directly above it is the epicentre. Bangladesh lies close to the boundary where the Indian plate presses against the Eurasian plate, so the country is genuinely at risk. The greater danger here, however, is not the shaking itself but the buildings: much of our construction has not followed the building code, and a moderate earthquake in a badly built city does far more harm than a strong one in a well-built city.

Earthquake Paragraph (200 Words)

An earthquake is a sudden and violent shaking of the ground caused by the movement of rock deep below the surface. The outer shell of the earth is not a single piece but a set of great plates that grind slowly against one another. Where two plates lock together, strain builds up over many years until the rock finally slips along a fault. The stored energy is released as seismic waves that spread outward in every direction, and it is those waves that shake the ground. The underground point where the slip begins is called the focus, and the point on the surface immediately above it is the epicentre, where the damage is usually greatest.

Bangladesh sits near the boundary at which the Indian plate is pressing northward against the Eurasian plate, and several active fault zones lie in and around the country. The real danger, however, lies in how we have built. Much of the construction in our cities has ignored the building code, buildings stand close together on soft alluvial soil, and narrow lanes would make rescue almost impossible. A moderate earthquake in a well-built city does little; the same earthquake in a badly built one can be a catastrophe.

Earthquake Paragraph (250 Words)

An earthquake is a sudden shaking of the earth's surface produced by the release of energy stored in rock. The outer shell of the earth is divided into great plates that move slowly and continuously. Where these plates meet they may lock together, and strain accumulates for years or centuries until the rock breaks along a fault and the two sides slip past one another. The energy is released as seismic waves that travel outward from the point of rupture. The focus is the point underground where the break begins; the epicentre is the point on the surface directly above it, and it is there that the shaking is usually strongest.

The strength of an earthquake is measured on a magnitude scale, each whole number representing a large increase in the energy released. But magnitude alone does not decide how much harm is done. Depth matters, because a shallow earthquake shakes the surface far more violently than a deep one of the same size. Soil matters too: soft, water-saturated ground such as the alluvium beneath Dhaka amplifies the shaking and can even lose its strength altogether.

Bangladesh lies close to where the Indian plate presses against the Eurasian plate, and active faults run through and around the country. Our vulnerability, though, is largely of our own making. Buildings raised without following the code, standing shoulder to shoulder on soft soil along lanes too narrow for a fire engine, are the real hazard. Enforcing the building code and preparing families is the only protection available.

Earthquake Paragraph (300 Words)

An earthquake is a sudden and often violent shaking of the ground caused by the release of energy stored deep within the earth. The earth's outer shell is broken into a number of great plates which move against one another at a rate of a few centimetres a year. Where two plates meet, friction can lock them together while the pressure behind them continues to build. Eventually the rock can hold no longer and breaks along a fault, and the two sides slip suddenly past each other. The energy released radiates outward as seismic waves, and it is these that shake the ground. The point below the surface at which the rupture begins is called the focus, and the point on the surface immediately above it is the epicentre.

The size of an earthquake is described by its magnitude, but magnitude alone does not determine the damage. A shallow earthquake shakes the surface much more severely than a deep one of the same magnitude. The nature of the ground matters as well: firm rock transmits the shaking without adding to it, whereas soft, water-logged alluvial soil amplifies the waves and, in extreme cases, can behave almost like a liquid and allow buildings to sink or topple.

Bangladesh is genuinely exposed. The country lies close to the boundary where the Indian plate is driving northward beneath the Eurasian plate, and several active fault zones lie in and around our territory. Yet the greatest part of our danger is of our own making. Much of the building in our cities has not followed the code, structures stand tightly packed on soft ground, and the lanes between them are too narrow for rescue equipment to pass. Enforcing the building code on new construction, assessing older buildings and teaching families what to do in the first minute would reduce the danger far more than any warning system could.

Earthquake Paragraph (500 Words)

What an earthquake is

An earthquake is a sudden shaking of the earth's surface caused by the release of energy stored in rock beneath it. The outer shell of the earth, called the lithosphere, is not one continuous piece; it is broken into a number of great plates that drift slowly over the hotter, softer material below. Where two plates meet they may slide past one another, pull apart, or press together. Friction often locks them, and strain then builds up over years or centuries until the rock can bear no more and breaks along a fracture known as a fault. The stored energy is released in an instant as seismic waves that travel outward in every direction.

The point underground at which the rupture begins is the focus or hypocentre; the point on the surface directly above it is the epicentre. Shaking is usually strongest at the epicentre and grows weaker with distance, though the pattern is often complicated by the kind of ground the waves pass through.

What decides the damage

Magnitude describes the energy released, but it is only one of the factors that decide how much harm an earthquake does. Depth is critical: a shallow earthquake delivers its energy to the surface with far greater violence than a deep one of the same magnitude. The nature of the ground matters just as much. Hard rock transmits the shaking without adding to it, while soft, water-saturated sediment amplifies the waves considerably and may even lose its strength entirely in a process called liquefaction, allowing solid buildings to sink or tilt.

Above all, damage depends on what has been built. Earthquakes very rarely kill people directly; collapsing buildings do. This is why two countries can experience earthquakes of similar size and suffer entirely different losses.

The risk to Bangladesh

Bangladesh lies close to the boundary at which the Indian plate is driving northward against the Eurasian plate, and several active fault zones lie in and around the country. Historical records describe severe earthquakes in this region in the past, and the strain along these faults continues to accumulate.

Our vulnerability, however, is largely of our own making. A great deal of construction in our cities has not followed the building code. Buildings stand tightly packed on soft alluvial soil, many have been extended upward without any assessment of the foundations, and the lanes between them are frequently too narrow for a fire engine or an ambulance to enter. In such conditions even a moderate earthquake could cause enormous loss.

What can be done

Earthquakes cannot be predicted or prevented, but their effects can be greatly reduced. The building code must be enforced on new construction and older buildings assessed and strengthened. Families should fix heavy furniture to walls, keep a torch and drinking water within reach, and agree on a place to meet outside. Every student should know the drop, cover and hold rule: get under a sturdy table, protect the head, and stay there until the shaking stops, leaving by the stairs only afterwards. Preparation is the only real defence we have.

Earthquake Paragraph (800 Words)

Introduction

An earthquake is a sudden shaking of the ground caused by the abrupt release of energy that has been stored in the rocks of the earth's crust. It is among the most feared of natural hazards, partly because it strikes without warning and partly because the destruction can be so complete. Unlike a cyclone or a flood, which can be watched approaching for days, an earthquake gives no notice at all: the ground is still one moment and moving the next.

The cause of earthquakes

The outer shell of the earth is broken into a number of large rigid plates that float on the hotter, more plastic material beneath. Driven by slow currents in that deeper layer, these plates move against one another at a rate of a few centimetres each year — about as fast as a fingernail grows. Where two plates meet, they may slide past each other, move apart, or press together. Friction frequently locks the rock at the boundary while the plates behind continue to move, and the strain builds steadily.

Eventually the rock reaches the limit of what it can bear and fractures along a plane of weakness called a fault. The two sides slip suddenly past one another, and the energy stored over decades or centuries is released in a few seconds as seismic waves. The point underground where the rupture begins is called the focus; the point on the surface directly above it is the epicentre.

Measuring an earthquake

The size of an earthquake is described by its magnitude, calculated from the amplitude of the waves recorded by seismographs. The scale is logarithmic, so each whole number represents a very large increase in energy released. Intensity, by contrast, describes what was actually felt and damaged at a particular place, and a single earthquake therefore has one magnitude but many intensities.

Magnitude is not the whole story. A shallow earthquake delivers its energy to the surface far more violently than a deep one of the same size. The ground itself also matters greatly: hard rock passes the waves on without adding to them, while soft, water-saturated sediment amplifies them considerably. In extreme cases such soil can undergo liquefaction, temporarily losing its strength so that buildings sink or topple even though the structures themselves are sound.

Why buildings decide the outcome

It is often said that earthquakes do not kill people, buildings do, and the statement is close to the truth. Very few deaths in an earthquake are caused by the shaking itself; the great majority are caused by structures collapsing on the people inside them. This is why two countries can experience earthquakes of almost identical magnitude and suffer entirely different losses. Where the building code is enforced and structures are designed to flex rather than shatter, a strong earthquake may cause remarkably little loss of life. Where construction has been careless, a far weaker one can destroy a city.

The position of Bangladesh

Bangladesh lies close to the boundary along which the Indian plate is driving northward against the Eurasian plate, the same collision that raised the Himalayas and continues to raise them. Several active fault zones lie within and around the country, and the historical record contains accounts of severe earthquakes in this region.

Our exposure, however, is compounded by how we have built. Much construction in Dhaka, Chattogram and Sylhet has not followed the building code. Buildings stand shoulder to shoulder on soft alluvial deposits, extra floors have often been added without any reassessment of the foundations, and the lanes between the buildings are frequently too narrow for a fire engine or an ambulance to pass. Utility lines run overhead and would come down with the first serious shaking. In such conditions even a moderate earthquake could cause devastation out of all proportion to its magnitude.

Reducing the danger

Earthquakes cannot be predicted with any useful accuracy and they certainly cannot be prevented, but their consequences can be reduced enormously. The building code must be enforced on all new construction rather than merely printed, and older buildings, particularly schools and hospitals, should be assessed and strengthened. Open spaces must be preserved in dense areas so that people have somewhere to go.

At the level of the household, preparation costs almost nothing. Heavy furniture and water tanks should be fixed to walls. A torch, drinking water and a whistle should be kept where they can be reached in the dark. Every family should agree on a meeting place outside the building. Above all, everyone should know the rule: drop, cover and hold — get under a sturdy table, protect the head and neck, and remain there until the shaking stops, leaving afterwards by the stairs and never by the lift.

Conclusion

An earthquake is a reminder of how little control we have over the planet we live on. We cannot stop the plates moving, and we cannot know when the rock will break. What we can decide is what stands on the ground when it does. In Bangladesh that decision has too often been made carelessly, and correcting it is the most useful work that could be done. Preparation is not pessimism; it is the only sensible response to a danger we know is coming without knowing when.

Earthquake Paragraph (1000 Words)

Introduction

Among all natural hazards, the earthquake is perhaps the most frightening, because it offers no warning whatever. A cyclone can be tracked for days across the bay and a flood can be watched rising hour by hour, but the ground gives no sign at all before it begins to move. An earthquake is a sudden shaking of the earth's surface caused by the abrupt release of energy stored in the rocks of the crust, and its consequences depend far less on the size of the event than on what human beings have chosen to build.

How earthquakes are caused

The outer shell of the earth is not a single continuous layer. It is broken into a number of large, rigid plates that rest on hotter and more plastic material below and are carried slowly along by currents within it. These plates move at a few centimetres a year, roughly the rate at which a fingernail grows, and where they meet they interact in one of three ways: sliding past one another, moving apart, or pressing together.

At most boundaries the rock does not slide smoothly. Friction locks the two sides while the plates behind them continue to move, and strain accumulates in the rock over years, decades or centuries. Eventually the accumulated stress exceeds what the rock can bear, and it fractures along a plane of weakness called a fault. The two sides slip suddenly past one another, and all the energy stored during that long period of locking is released within seconds in the form of seismic waves radiating outward in every direction.

The place underground where the rupture begins is called the focus or hypocentre, and the point on the surface directly above it is the epicentre. Damage is usually greatest near the epicentre and decreases with distance, although the pattern is often irregular because of the different kinds of ground the waves must pass through.

Measurement and intensity

The magnitude of an earthquake is calculated from the amplitude of the waves recorded on seismographs, and the scale is logarithmic: each whole number represents roughly a thirtyfold increase in the energy released. Magnitude is a single number describing the event itself. Intensity is different — it describes what was actually experienced and damaged at a particular place, so one earthquake has a single magnitude but a whole range of intensities across the region it affects.

Two factors besides magnitude do a great deal to determine the outcome. The first is depth: a shallow earthquake delivers its energy to the surface with much greater violence than a deep one of equal magnitude, because the waves have travelled a shorter distance and lost less strength. The second is the nature of the ground. Hard bedrock transmits seismic waves without adding to them, whereas soft, water-saturated sediment amplifies them substantially. In severe cases such soil undergoes liquefaction: the grains lose contact with one another, the ground temporarily behaves like a thick liquid, and buildings sink, tilt or topple even though their own structure is undamaged.

Why the built environment decides the outcome

It is often observed that earthquakes do not kill people but buildings do, and the observation is very nearly accurate. Deaths caused directly by ground movement are rare; the overwhelming majority are caused by structures falling on the people inside them, and by the fires, gas leaks and blocked escape routes that follow.

This explains why earthquakes of similar magnitude produce entirely different results in different countries. Where a building code is genuinely enforced and structures are designed to flex and absorb energy rather than resist it rigidly, a strong earthquake may cause remarkably little loss of life. Where construction has been careless — thin columns, poor concrete, extra floors added to foundations never designed to carry them — a considerably weaker earthquake can flatten whole neighbourhoods.

The position of Bangladesh

Bangladesh lies close to the boundary along which the Indian plate is driving northward into the Eurasian plate. This is the same collision that raised the Himalayas and is still raising them, and the strain it generates is taken up along a number of fault zones that lie within and around our territory. The historical record describes severe earthquakes in this region in earlier centuries, and the pressure along those faults has been accumulating ever since.

Our danger, however, has been greatly increased by the way we have built. A large proportion of construction in Dhaka, Chattogram and Sylhet has not followed the building code, whatever the plans submitted may have shown. Buildings stand tightly packed together on soft alluvial deposits which will amplify any shaking. Additional storeys have frequently been added to structures whose foundations were never assessed for them. The lanes between buildings in older parts of the cities are too narrow for a fire engine or an ambulance to enter, and overhead utility lines would come down at the first serious movement. Under such conditions a moderate earthquake could cause destruction wholly out of proportion to its magnitude.

What can be done

Earthquakes cannot be predicted with any useful precision, and they certainly cannot be prevented. Everything that can be done, therefore, must be done in advance.

At the level of policy, the building code must be enforced rather than merely published, and enforcement must apply to the construction itself and not only to the drawings. Existing buildings, and above all schools and hospitals, should be assessed and strengthened where they are found wanting. Open spaces must be protected in dense areas, since people need somewhere to go and rescuers need somewhere to work. Emergency services need equipment suited to collapsed masonry, and rescue drills should be held so that responsibilities are known before they are needed.

At the level of the household, useful preparation costs almost nothing. Heavy furniture, shelving and water tanks should be fixed to the walls, since falling objects cause many injuries. A torch, drinking water, a whistle and a small store of essential medicine should be kept where they can be found in darkness. Every family should agree on a meeting point outside the building. And everybody, particularly every student, should know the rule for the first minute: drop, cover and hold — get beneath a sturdy table, protect the head and neck, and remain there until the shaking has stopped, leaving afterwards by the stairs and never by the lift.

Conclusion

An earthquake is a reminder of how small a part of the earth's history we occupy and how little of it we control. The plates will continue to move, the strain will continue to build, and one day the rock beneath this region will break again. We cannot alter any of that. What we can decide is what will be standing on the ground when it happens, and whether the people inside those buildings will know what to do in the first ten seconds. Those decisions are being made now, in every new building raised without inspection and every family that has never discussed where to meet. Preparation is not a gloomy activity but a practical one, and it is the only defence that has ever worked.