GY 102 Lecture Notes - Lecture 5: Lake Texcoco, Mount Pinatubo, Subduction
30 Aug 2016
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Document Summary
Sudden movement of a block of the earth"s crust. Rate on two scales: magnitude - amount of energy released o. Intensity - effects of ground motion on people, structures. Huge (mw 9. 0) eq on subduction zone beneath japan. Displaced seafloor, forming a destructive tsunami that damaged fukushima nuclear reactor. Magnitude 7 eq on strike-slip faults near capital city of port-au-prince. Many deaths (~200,000) mostly due to collapse of poorly constructed buildings in this very poor country. Mw 7. 1 (2010) eq similar size to haiti but minor damage and no deaths. Mw 6. 3 (2011) eq smaller but more damage and killed 200 people; closer to city, and buildings had been damaged by 2010 eq. A vent in the surface of the earth through which magna and associated gases and ash erupt. The form of structure that is produced by the ejected material. 15 and 30 million tons of so2. 2 weeks - aerosol cloud appeared around earth.
