Earthquake in Kolkata: What is Earthquake? : What is an earthquake?, Causes of an earthquake, What is an earthquake, Causes of an earthquake, How does an earthquake occur etc. are answered here.
Earthquake in Kolkata
An earthquake was felt in Kolkata at dawn. Mild earthquakes were felt not only in Kolkata but also in Bangladesh, Assam and Tripura. More details …
Earthquake on Friday morning. The city of Kolkata shook. The tremors were felt not only in Kolkata but also in North Bengal, Assam, Tripura, Manipur and Bangladesh. An earthquake shook the border between India and Myanmar on this day. Several states, including Kolkata and Bangladesh, were shaken by the aftershocks.
Tilottama trembled at 5:15 in the morning. According to the National Center for Seismology, the tremors were felt for 30 seconds this morning. The epicenter was reported 63 kilometers southeast of Thanjaul in Mizoram. The tremor was felt at a depth of 12 km. Not only Kolkata, but also Upper Bengal has been shaken. The magnitude of the tremor was 7.1. “This is the longest earthquake I’ve ever felt,” wrote a Mizoram netizen shortly after the quake was felt.
Meanwhile, Upper Bengal also trembled. It is learned that tremors have been felt in several places including Dhaka and Chittagong, the capital of Bangladesh. Bengalis were asleep in the early morning of winter. In the meantime the bed shook. However, the tremors stopped after a while. After that, netizens filled their comments on social media. “It’s just an earthquake,” wrote one netizen.
On the other hand, it is being claimed in the net that tremors have been felt not only in Kolkata but also in several districts. Although that picture is still not clear. It is reported that parts of Howrah and Hughli were also shaken by the quake. Vibration intensity 6.1. In other words, experts say that it is very strong. In their words, the tremors were intense. However, no casualties have been reported so far.
Meanwhile, the eminent geologist in the context of the earthquake. “The way the climate is changing at the moment, the sea level is rising,” said Sujeeb. As a result, there may be another earthquake in the coming days. Several significant incidents have taken place in the last two or three days. An earthquake measuring 5.7 on the Richter scale shook the Indian Ocean the day before yesterday. There was an earthquake in Indonesia yesterday. He was accompanied by several earthquakes in the Philippines. This indicates that the Indo-Australian plate is being pushed by the Pacific Ocean on one side and the African Ocean on the other. As a result, the Indo-Asian plate, on which India is located, is penetrating the soil in that region.
What is Earthquake?
Earthquake literally means “ground vibration” which means vibration or movement within the land. Due to sudden strong movement on the earth’s surface, the internal energy of the earth is released, due to which seismic waves are formed. Due to the formation of seismic waves, there is a change in the state of the earth and this change is called earthquake which can be in both small or large forms. Seismic waves are measured with an instrument called a seismograph, in addition to this the instrument used to measure the intensity of an earthquake is called the Richter scale.
Main Causes of Earthquake
Following are the main causes of earthquakes –
Volcanic eruption
Volcanic eruptions can be a major cause of earthquakes in an area. When a volcanic eruption occurs in an area, it directly affects the nearby areas of that area. Due to volcanic eruption, movement or vibration occurs on the land of adjacent areas, which is called earthquake. In areas exposed to volcanic eruptions, the impact of earthquakes is both greater and lesser, depending on the type of volcano.
Land imbalance
Earthquakes are also prone to occur due to the imbalance of different layers of the land. The upper surface of the land is lighter than the lower surface and if there is an imbalance between these two surfaces in an area, then due to vibration in that place, land erosion etc. starts which is called earthquake. Therefore, earthquakes also occur due to the imbalance behavior of the land.
Water load
Large reservoirs are created by building dams on rivers. Due to excessive amount of water in the reservoirs, water starts exerting its influence in the rocks, due to which the pressure in the rocks changes, their position starts changing and due to these changes, the land starts stirring, due to which there is a possibility of strong earthquakes. Lives.
Shrinking of the earth
The Earth has been shrinking since its birth, due to which many changes can be seen in its various layers. When the surface of the earth shrinks, it starts changing in its state and due to this, the internal part of the land starts vibrating due to which the upper surface starts shaking and the land starts splitting into many blocks. Earthquake is the splitting of land into many parts.
Elastic reflex theory
Elastic rebound theory was propounded by Dr. SF Reed, a famous geologist in America and for this reason this theory is also called Dr. SF Reed’s theory. According to this theory, the earthquake occurring in any region depends on the flexibility of the mechanical composition rocks. When the stress on the rocks of a place increases, they bend but when the stress exceeds the limit of the flexibility of the rocks, then the rocks start breaking and split into two separate fragments. Due to splitting, the rock moves in the opposite direction due to cracks between the rock fragments. By this action the stress of the rock is released and both the blocks of rock try to come back in their position and result in earthquake.
Principle of plate tectonics
Plate tectonics is the cause of most earthquakes in the Pacific Ocean. Earthquakes mainly occur at the edge of the plates. Low-center earthquakes are found along almost all plates, and medium-depth earthquakes are seen in the ocean trenches, the center of these earthquakes is at a depth of about 200 km. Earthquakes of medium depth are produced by tension and compression and earthquakes of greater depth are produced by compression only.
Conclusion
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