| Project/Area Number |
23540488
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Chiba University |
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Principal Investigator |
TSUMURA Noriko 千葉大学, 理学(系)研究科(研究院), 助教 (00272302)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAMATSU Yoshihiro 金沢大学, 理工研究域, 准教授 (80283092)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | Q値 / 能登半島地震 / 地震波減衰 / Ｑ値 / 内陸地震 |
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| Research Abstract |
Tsumura et al.(2012) mapped a seismic attenuation (Qp) structure in the source region of the 2007 Noto Hanto earthquake. The results show low Qp zone is seen at the main shock fault, where aftershocks' activity is high. Next we made Qp/Qs estimation for several ray paths by using spectral ratio method. Obtained Qp/Qs for the low Qp zone in the main shock fault is higher than that of the surrounding area. In conjunction with other geophysical data, these attenuation features might be caused by the rupture of the main shock.
To detect the temporal change of seismic structure near the source region, we made the other temporary seismic observations in 2011 and in 2012. In these observations, we set seismic stations, whose locations were same as those of 2007 observation. The result for 2011 and 2012 observation data shows that ray paths having high Qp/Qs concentrated on the west coast area of Noto Peninsula where high Qp/Qs was observed in 2007, and temporal change of Qp/Qs was not clear.
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