2011 Fiscal Year Final Research Report
Analysis of the short-period wave propagation in the ionosphere associated with earthquakes using 4D GPS tomography
| Project/Area Number |
20340123
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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 | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
OBAYASHI Masayuki 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 主任研究員 (30359179)
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| Co-Investigator(Kenkyū-buntansha) |
WATADA Shingo 東京大学, 地震研究所, 助教 (30301112)
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| Co-Investigator(Renkei-kenkyūsha) |
OZAWA Shinzaburo 国土地理院, 地理地殻活動研究センター, 主任研究官 (70370806)
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| Project Period (FY) |
2008 – 2011
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| Keywords | トモグラフィー / 電離層擾乱 / 地震が発生する大気波動 / GPS-TEC擾乱 / GEONET / 大気重力波 / 長周期音波 / 大気境界波 |
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| Research Abstract |
Ionospheric electron density disturbance that is often observed after large earthquakes can be measured from the delay of the carrier wave from the GPS navigation satellites. We developed a method to obtain the time variation images of the 3D structure of the ionospheric disturbance using 1Hz-sampling data from GEONET operated by GSI. By applying the method to the 2004 Tokachi-Oki earthquake, we have shown that the ionosphere disturbance is the dispersive sound wave from the ground and the ocean surface. The sound waves were generated by the large-scale crustal deformation and reached to the ionosphere.
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