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Coseismic gravity changes of the 2011 Tohoku-Oki earthquake from satellite gravimetry
| Title: | Coseismic gravity changes of the 2011 Tohoku-Oki earthquake from satellite gravimetry |
| Authors: | Matsuo, Koji Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | GRACE detected coseisimic gravity changes by 2011 Tohoku-Oki earthquake | | The third case that GRACE detected coseisimic gravity changes | | Coseismic gravity change roughly scales with the seismic moment |
| Issue Date: | 22-Sep-2011 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical Research Letters |
| Volume: | 38 |
| Start Page: | L00G12 |
| Publisher DOI: | 10.1029/2011GL049018 |
| Abstract: | The massive Tohoku-Oki earthquake of a moment magnitude (Mw) of 9.0 occurred on 11 March, 2011 off the Pacific coast of the Northeastern Japan. The mass redistribution in and around the focal region associated with this earthquake was studied using the gravity changes detected by Gravity Recovery and Climate Experiment (GRACE) satellite. After the 2004 Sumatra-Andaman and the 2010 Central Chile (Maule) earthquakes, the present study presents the third case of clear detection of coseismic gravity changes by GRACE. The observed gravity changes were dominated by decrease over the back-arc region of ∼7 μGal or less. This reflects, to a large extent, coseismic crustal dilatation of the landward plate. They agree well with the changes calculated with the Green's function for the realistic earth using fault parameters inferred from coseismic crustal movements. The spatial patterns of the gravity changes of these earthquakes are very similar because they are all shallow angle reverse faulting at convergent plate boundaries. We found linear relationship between gravity decreases and seismic moments. |
| Rights: | Copyright 2011 by the American Geophysical Union |
| Type: | article |
| URI: | http://hdl.handle.net/2115/48676 |
| 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)
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Submitter: 日置 幸介
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