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Coseismic gravity changes of the 2010 earthquake in central Chile from satellite gravimetry

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Title: Coseismic gravity changes of the 2010 earthquake in central Chile from satellite gravimetry
Authors: Heki, Kosuke Browse this author →KAKEN DB
Matsuo, Koji Browse this author
Keywords: 2010 Chile earthquake
coseismic gravity change
time-variable gravity
Issue Date: 23-Dec-2010
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 37
Issue: 24
Start Page: L24306
Publisher DOI: 10.1029/2010GL045335
Abstract: The first map of coseismic changes in gravity and geoid height has been drawn using the data from the Gravity Recovery and Climate Experiment (GRACE) satellites for the 2004 Sumatraゥ\Andaman earthquake. Here we present the second case of coseismic gravity change observation by satellite gravimetry, i.e., the change caused by an interplate thrust earthquake that occurred on 27 February, 2010 in Central Chile (Mw = 8.8). Gravity showed a negative jump with the largest drop of 。ォ5 mgal on the backゥ\arc side. The observed changes agree with those calculated assuming the realistic earth and fault parameters inferred from coseismic displacements of Global Positioning System (GPS) stations. Gravity in this area shows large seasonal and interゥ\annual variability, and postseismic gravity changes could be isolated only by carefully removing hydrological signals.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日置 幸介

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