0 on the Richter scale. They formed new lakes, changed the course of the Mississippi River, and could be felt at least a little in a 50,000 square mile area. In contract, the San Francisco 1906 earthquake could be felt moderately in a 60,000 square mile area, even though it was a smaller quake.
Kobe earthquake - Occurred in 1995 and measured 7.3 on the Richter scale. Nearly 6,500 people died in the quake. It caused ten trillion yen in damage, which was 2.5% of Japan's GDP at the time, making it the worst earthquake in Japan since the Great Kanto earthquake in 1923. It is the costliest earthquake in recorded history.
Mexico City quake...
This happens as the magma chamber empties and a ring fracture occurs. This collapse often blocks the flow of magma but the heated interior still produces gasses and steam. Often, that steam and other gasses create a lake in the middle of the caldera similar to Crater Lake in Oregon or Glen Coe in Scotland. 8. WHY DO SOME VOLCANOES EXPLODE, WHILE OTHERS EMIT ONLY GASEOUS CLOUDS? Some volcanoes explode because
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