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Crustal subsidence observed by GRACE after the 2013 Okhotsk deep-focus earthquake

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Title: Crustal subsidence observed by GRACE after the 2013 Okhotsk deep-focus earthquake
Authors: Tanaka, Yusaku Browse this author
Heki, Kosuke Browse this author →KAKEN DB
Matsuo, Koji Browse this author
Shestakov, Nikolay V. Browse this author
Keywords: GRACE
coseismic gravity change
crustal deformation
2013 Okhotsk deep-focus earthquake
satellite geodesy
Issue Date: 16-May-2015
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 42
Issue: 9
Start Page: 3204
End Page: 3209
Publisher DOI: 10.1002/2015GL063838
Abstract: Coseismic gravity changes stem from (1) vertical deformation of layer boundaries with density contrast (i.e., surface and Moho) and (2) density changes of rocks at depth. They have been observed in earthquakes with M-w exceeding similar to 8.5 by Gravity Recovery and Climate Experiment (GRACE) satellites, but those of M8 class earthquakes have never been detected clearly. Here we report coseismic gravity change of the 24 May 2013 Okhotsk deep earthquake (M(w)8.3), smaller than the detection threshold. In shallow thrust faulting, factor (2) is dominant, while factor (1) remains secondary due to poor spatial resolution of GRACE. In the 2013 Okhotsk earthquake, however, factor (2) is insignificant because they occur at depth exceeding 600km. On the other hand, factor (1) becomes dominant because the centers of uplift and subsidence are well separated and GRACE can resolve them. This enables GRACE to map vertical ground movements of deep earthquakes over both land and ocean.
Rights: Copyright 2015 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

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