| Project/Area Number |
26800233
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 電磁場変動 / 地震 / 弾性波動場 / 応力磁気効果 / 電気伝導度 / 観測可能性 / 早期地震警報 / 時間領域 / 地磁気 / 点震源 / 地震波に先行する電磁場変動 / 時間領域解 |
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| Outline of Final Research Achievements |
There are several reports on electromagnetic (EM) signals that are observed a few seconds prior to arrival of seismic waves. A candidate mechanism that generates such EM signals is the piezomagnetic effect, that is, changes in magnetization corresponding to changes in applied stress. The objective of this project is to derive a set of equations that describes EM signals from the piezomagnetic effect, and to answer whether the piezomagnetic effect accounts the earlier reports or not.
I successfully derived the desired equations. Numerical considerations using the obtained equations suggest that EM variations from the piezomagnetic effect during ruptures are not large enough to be observed by using the present technique of observation. This means that EM signals prior to seismic waves should be accounted by other mechanisms.
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