Did you know that there are 4 types of earthquakes?

The Earth, in its constant state of motion, occasionally experiences seismic activities leading to earthquakes. Recently, on 3rd November, Nepal was hit by two deadly earthquakes measuring 7.8 and 7.3. Tremors were felt in Delhi NCR and parts of North India too. Even today, on 6th November, a quake of 5.6 magnitude struck Nepal again. Have you ever thought of delving into the world of geology and seismic events? Well, if you did, you would know that there are 4 types of earthquakes.


Earthquakes occur due to the sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. Understanding various types of earthquakes sheds light on the diverse geological forces that shape our planet's surface. It will also broaden your understanding of geological events and their impact on the environment while providing a foundation for further studies in seismology, plate tectonics, and the Earth's structure. Let’s explore together all the four types of earthquakes and the mechanism behind each.


Tectonic Earthquakes

Tectonic earthquakes are the most common type, occurring at the boundaries of tectonic plates. These are caused by the movement of these plates, either colliding, sliding past each other (strike-slip), or moving apart. The intense pressure and stress buildup along these boundaries lead to sudden movements, resulting in seismic waves and ground shaking. Here are a few examples of tectonic earthquakes: Great East Japan Earthquake, 2011 (Magnitude: 9.0), Sumatra-Andaman Earthquake, 2004 (Magnitude: 9.1-9.3) and Haiti Earthquake, 2010 (Magnitude: 7.0).


Volcanic Earthquakes

Volcanic earthquakes occur in conjunction with volcanic activity. As magma moves beneath the Earth's surface and rises towards the volcano, it causes stress on the surrounding rocks. When the pressure exceeds the rocks' strength, earthquakes are triggered. These seismic events are often precursors to volcanic eruptions. Here are a few examples of volcanic earthquakes: Krakatoa volcanic eruption, 1883, Philippines, Mount St. Helens eruption, 1980, USA, Mount Pinatubo's seismic unrest, 1991, Philippines.


Collapse Earthquakes

Collapse earthquakes happen in underground caves, mines, or reservoirs due to the sudden collapse of rock formations. The voids left behind after mining or drilling can cause the overlying rocks to cave in, resulting in seismic waves. These earthquakes are localized and relatively small but can be hazardous in specific areas. Here are a few examples of collapse earthquakes: San José Mine collapse, Chile, 2010, Utah Crandall Canyon Mine collapse, USA, 2007 and Soma Coal Mine disaster, Turkey, 2014.


Explosion Earthquakes

Explosion earthquakes are a result of human activities such as mining, construction, or detonating explosives. These are induced seismic events caused by sudden energy release due to human activities rather than natural tectonic or volcanic activities. They are generally smaller in magnitude but can still cause shaking. Here are a few examples of infamous explosion earthquakes: Tianjin explosion, China, 2015, Beirut explosion, Lebanon, 2020, Texas City explosion, USA, 1947.


Summing up

Understanding the variations in earthquake types serves beyond academic learning. It offers insights into hazard preparedness, environmental planning, and infrastructure development. It promotes awareness about potential risks in areas prone to earthquakes and aids in the implementation of safety measures. For those interested in geology, understanding different earthquake types provides a foundation for further studies in seismology, plate tectonics, and the Earth's structure.
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