2011 Fiscal Year Final Research Report
Generation of electromagnetic field due to resonance between ground velocity and ions motion in the Earth's magnetic field
| Project/Area Number |
21340126
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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 | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HONKURA Yoshimori 東京工業大学, 大学院・理工学研究科, 名誉教授 (00114637)
OGAWA Yasuo 東京工業大学, 火山流体研究センター, 教授 (10334525)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 地震現象 / 地球磁場 |
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| Research Abstract |
Based on simultaneous observations of ground velocity and electromagnetic field, we have investigated the seismic dynamo effect, in which temporal variations of electromagnetic field associated with ground velocity are caused by cyclotron motion of ions contained in groundwater under the Earth's magnetic field. Circularly polarized electric field, detection of electric field earlier than arrival of seismic waves, and peak frequencies of the transfer function between ground velocity(input) and electric field(output) at cyclotron frequencies for ions in groundwater strongly support the seismic dynamo effect.
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