Determination of focal mechanisms of non-volcanic tremors based on their wavefield properties and elucidation of generation mechanisms of tremors
Project/Area Number |
24540463
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Solid earth and planetary physics
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Research Institution | National Institute of Advanced Industrial Science and Technology |
Principal Investigator |
IMANISHI Kazutoshi 独立行政法人産業技術総合研究所, 活断層・火山研究部門, 研究グループ長 (70356517)
|
Project Period (FY) |
2012-04-01 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
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Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 非火山性深部低周波微動 / 振動特性 / メカニズム解 / 臨時地震観測 / 西南日本 / 波動特性 / 発震機構解 / S波異方性 / S波異方性 |
Outline of Final Research Achievements |
We proposed a method to determine focal mechanisms of non-volcanic tremors using S-wave polarization data. Because the shear-wave splitting analysis indicated the need of the correction for splitting effects, we also developed a procedure to recover the source S-wave polarization angle. We applied the present method to a tremor sequence at Kii Peninsula, southwest Japan and confirmed its applicability. Most estimated focal mechanism solutions show low-angle thrust faults, which are basically consistent with the geometry of the plate interface. We also found some events that contain strike-slip components at a specific location, providing us an important tool for inferring detailed stress fields around the plate boundary as well as the geometry of plate interface.
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Report
(4 results)
Research Products
(4 results)