HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >

Coseismic gravity changes of the 2011 Tohoku-Oki earthquake from satellite gravimetry

Files in This Item:
2011GL049018.pdf387.84 kBPDFView/Open
Please use this identifier to cite or link to this item:

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
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

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University