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Aseismic slip during the 1996 earthquake swarm in and around the Onikobe geothermal area, NE Japan

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Title: Aseismic slip during the 1996 earthquake swarm in and around the Onikobe geothermal area, NE Japan
Authors: Takada, Youichiro Browse this author
Furuya, Masato Browse this author →KAKEN DB
Keywords: aseismic slip
earthquake swarm
topographic growth
Onikobe caldera
Issue Date: 20-Feb-2010
Publisher: Elsevier B.V.
Journal Title: Earth and Planetary Science Letters
Volume: 290
Issue: 3-4
Start Page: 302
End Page: 310
Publisher DOI: 10.1016/j.epsl.2009.12.024
Abstract: In August 1996, an earthquake swarm including 4 earthquakes of magnitudes greater than 5 occurred in and around the Onikobe geothermal area, northeast Japan. While earlier studies detected ground displacements by L-band JERS radar interferograms, there remained certain puzzling discrepancies between the observations and the predictions from a seismologically inferred model, and no satisfactory models have yet been proposed. Here, by identifying that a steep gradient in the radar line-of-sight changes exists in seismicity gaps to the east and west of the Torage area (just to the north of the Onikobe caldera), we propose two aseismic reverse faults, which turn out to contribute to a local topographic growth as well as explaining the pre-existing discrepancies. Another significant signal is detected in a region in which no large earthquakes occurred; we account for this signal by another aseismic fault. This fault adds to another evidence for the recent hypothesis that aseismic fault motion drives earthquake swarm.
Type: article (author version)
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: 古屋 正人

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