2009 Fiscal Year Final Research Report
Deciphering deformation styles of inland plate boundaries by InSAR
| Project/Area Number |
19340123
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Hokkaido University |
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Principal Investigator |
FURUYA Masato Hokkaido University, 大学院・理学研究院, 准教授 (60313045)
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| Co-Investigator(Kenkyū-buntansha) |
TAKADA Youichiro 海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (80466458)
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| Project Period (FY) |
2007 – 2009
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| Keywords | SAR / InSAR / ピクセルオフセット法 / ALOS / 内陸地震 / ゆっくり地震 / 非地震性断層 / 〓川地震 / 岩手宮城内陸地震 |
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| Research Abstract |
Using SAR data, we detected crustal deformation signals associated with several inland earthquakes in and around continental plate boundaries. All the data revealed unexpected signals that could not be predicted from the prompt seismological estimates of the fault sources, and thus would be overlooked if SAR were not used. We discovered a long-lasting afterslip due to the M5 earthquake at the Chaman fault, Afghanistan. All the events, including the 1996 Onikobe, 2007 Chuetsu-oki, 2008 Iwate-Miyagi, 2008 Yutian, 2008 Wenchuan, revealed complex crustal displacements that could not be explained by a single rectangular fault even with distributed slip, which suggest that a geometric complexity is a universal character of inland earthquakes. In the Onikobe and Chuetsu-oki events, we also detected significant signals outside the main shock fault that were attributed to aseismic fault motion.
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