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An intraplate slow earthquake observed by a dense GPS network in Hokkaido, northernmost Japan

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Title: An intraplate slow earthquake observed by a dense GPS network in Hokkaido, northernmost Japan
Authors: Ohzono, Mako Browse this author
Takahashi, Hiroaki Browse this author →KAKEN DB
Ichiyanagi, Masayoshi Browse this author
Keywords: Satellite geodesy
Transient deformation
Creep and deformation
Intraplate processes
Dynamics and mechanics of faulting
High strain deformation zones
Issue Date: Jan-2015
Publisher: Oxford University Press
Journal Title: Geophysical Journal International
Volume: 200
Issue: 1
Start Page: 144
End Page: 148
Publisher DOI: 10.1093/gji/ggu380
Abstract: An intraplate slow earthquake was detected in northernmost Hokkaido, Japan, by a dense network of the global navigation satellite system. Transient abnormal acceleration of <12 mm was observed during the period 2012 July to 2013 January (similar to 5.5 months) at several sites. The spatial displacement distribution suggests that a localized tectonic event caused localized deformation. Estimated fault parameter indicates very shallow-dip reverse faulting in the uppermost crust, with a total seismic moment of 1.75E + 17 N m (M-w 5.4). This fault geometry is probably consistent with detachment structure indicated by geological studies. A simultaneous earthquake swarm with the maximum magnitude M4.1 suggests a possibility that the slow slip triggered the seismic activity for unknown reasons. This slow earthquake is slower than its moment would indicate, with a duration-magnitude scaling relationship unlike either regular earthquakes or subduction slow slip events. This result indicates that even if the area is under different physical property from subduction zones, slow earthquake can occur by some causes. Slow earthquakes exist in remote regions away from subduction zones and might play an important role in strain release and tectonic activity.
Rights: This article has been accepted for publication in "Geophysical Journal International" © The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society.
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: 高橋 浩晃

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