deep focus earthquake are almost absent in the mid continental belt. give reason
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Explanation:
A deep-focus earthquake in seismology (also called a plutonic earthquake) is an earthquake with a hypocenter depth exceeding 300 km. They occur almost exclusively at convergent boundaries in association with subducted oceanic lithosphere. They occur along a dipping tabular zone beneath the subduction zone known as the Wadati–Benioff zone.[1]
This earthquake belt extends along the Alpine mountain system of Europe, north America, through Asia Minor, Caucasia, Iran, afganistan and Pakistan to the Himalayan mountain system, including Tibet, the pamir, Tien-Shan, altai, and the mountains of China, Myammar and eastern Siberia. This zone is characterized by larger earthquakes of shallow origin and some of intermediate origin. Deep focus earthquakes are almost absent in this belt. About 21 per cent of the total earthquakes of the world are recorded in this belt.
This belt includes the volcanoes of Alps mountains, Mediterranean Sea (Stromboli, Vesuvius, Etna, etc.), volcanoes of Aegean Sea, Mt. Ararat (Turkey), Elburz, Hindukush and Himalayas.
In addition to the above mentioned volcanoes, there are numerous scattered volcanoes in the inner parts of continents. The fissure lava flow covered more than 5,00,000 sq km of the peninsular india. Similarly massive fissure eruption occurred about 13,00,000 sq km to form Columbian plateau. Volcanic eruptions still occur in some of the relatively stable plates like the Deccan Plateau of india . The parana of Brazil and Paraguay were also formed of spread of lavas over an area of about 7,50,000 km.
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A deep-focus earthquake in seismology (also called a plutonic earthquake) is an earthquake with a hypocenter depth exceeding 300 km. They occur almost exclusively at convergent boundaries in association with subducted oceanic lithosphere. They occur along a dipping tabular zone beneath the subduction zone known as the Wadati–Benioff zone.[1]
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