Q. Name the major earthquake prone areas of the world and give details of the Circum-Pacific Belt.
11,Sep 2024
Posted By : SPM IAS Academy
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Earthquakes are most likely to occur in regions where tectonic plates interact. These areas are characterized by fault lines, volcanic activity, and significant seismic events. The major earthquake-prone areas of the world include:
Circum-Pacific Belt (Ring of Fire): This is the world’s most seismically active region, encircling the Pacific Ocean.
Alpide Belt: Extending from the Mediterranean region to the Himalayas and into Southeast Asia.
Mid-Atlantic Ridge: A tectonic plate boundary located along the floor of the Atlantic Ocean, where new oceanic crust is formed.
Himalayan Region: Formed by the collision between the Indian Plate and the Eurasian Plate.
East African Rift Valley: A tectonic plate boundary zone in Eastern Africa where the African Plate is splitting into two smaller plates.
San Andreas Fault Zone (California, USA): A major fault line between the Pacific Plate and the North American Plate.
Anatolian Fault Zone (Turkey): A region of intense seismic activity where the Anatolian Plate interacts with the Eurasian Plate.
Indonesian Archipelago: Located at the convergence of several tectonic plates, making it one of the most earthquake-prone regions in the world.
The Circum-Pacific Belt (Ring of Fire) The Circum-Pacific Belt, commonly known as the “Ring of Fire,” is the most seismically and volcanically active region in the world. It follows the boundaries of the Pacific Plate and several other tectonic plates. Below are key details about this region:
Geographical Extent:
The Ring of Fire stretches for about 40,000 kilometers, encircling the Pacific Ocean.
It passes through countries like Japan, Indonesia, the Philippines, New Zealand, Papua New Guinea, Canada, the United States (especially Alaska and the West Coast), Central America, and South America.
Tectonic Activity:
The Ring of Fire is characterized by the movement of several tectonic plates, including the Pacific Plate, the North American Plate, the Eurasian Plate, the Philippine Sea Plate, and the Indo-Australian Plate.
These plates interact through subduction (where one plate moves under another), causing frequent and powerful earthquakes.
The subduction zones are also responsible for the formation of deep ocean trenches like the Mariana Trench.
Volcanic Activity:
The Ring of Fire is home to about 75% of the world’s active and dormant volcanoes.
Notable volcanoes include Mount Fuji (Japan), Mount St. Helens (USA), Krakatoa (Indonesia), and Mount Pinatubo (Philippines).
Volcanic eruptions in this region are often explosive due to the subduction of oceanic plates beneath continental plates, leading to the formation of magma.
Seismic Activity:
The Ring of Fire is responsible for about 90% of the world’s earthquakes.
Major earthquakes, such as the 2011 Tōhoku earthquake in Japan and the 1964 Great Alaskan earthquake, have occurred in this region.
The region is also prone to tsunamis, which are often triggered by undersea earthquakes.
Impact on Human Populations:
The Ring of Fire affects millions of people living in its vicinity, as it passes through densely populated regions.
The economic impact of seismic activity in this region is significant, as earthquakes and volcanic eruptions can cause extensive damage to infrastructure and loss of life.
Governments and communities in this region have developed advanced early warning systems and disaster preparedness plans to mitigate the effects of seismic and volcanic activity.
In conclusion, the Circum-Pacific Belt, or Ring of Fire, is a crucial area of study for understanding global seismic activity. Its significance lies not only in its contribution to the Earth’s geological processes but also in its profound impact on human societies around the Pacific Rim.
