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|Title: ||The Aftershock Analyses of the February 27 2010 Chile M=8.8 Mega Earthquake|
|Authors: ||Hsuan-Cheng Wei;Matthew Miller;Victor Gallardo;Frauke Klingelhoeher;Jing-Yi Lin;Chao-Shing Lee|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2012-06-15T07:43:42Z
|Publisher: ||American Geophysical Union Fall Meeting|
|Abstract: ||abstract:In February 27 2010, Chile mega earthquake (M=8.8) occurred at the Maule area in middle of Chile. The epicenter location is 115 km, NNE direction (35.9° S, 72.73° W) from Concepción, the second biggest city in Chile. The main shock, in which the focal depth is about 35 km, is a thrust - type subduction earthquake where the Nazca Plate subduct/collied into the South America Plate (the Chile subduction system). The main shock caused more than 500-km long rupture in the accretionary prism that produced a destructive tsunami. It killed many thousands of people and damaged more buildings. Even up to today, the aftershocks and volcanic activities still occur continuously in this region. In 1960, the biggest earthquake (M=9.5), the human ever recorded event, occurred in south Chile. This imply that an incomplete release of tectonic energy. In order to understand the processes, we have deployed 18 OBSs at 4 months after the main shock. We recorded a total of 23-day data (July 15 - August 8). In this study, we analyses the P-wave and S-wave arrivals. The events were relocated by using one-dimensional global velocity model (iasp91). An initial result shows that the events were divided into three groups, and each of these groups mainly occurred at a shallow depth of 20-40 km. We propose that the plates keep in colliding and compressing in which the accretionary prism is uplifted. The thrust faults were probably grown in its stress intensity. This may provide a clue for the possible source of the future earthquake and tsunami.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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