| Project/Area Number |
10640400
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体地球物理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HIRATA Naoshi Earthquake Research Institute, The University of Tokyo, Professor, 地震研究所, 教授 (90156670)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1999: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1998: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Earthquake detection / Hypocenter determination / Scanning method / Microearthquake / Foreshock / Swarm earthquakes / 群列地震計 |
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| Research Abstract |
We proposed a scanning method of detecting and locating an earthquake. We assumed 3-D and time grid points in the studied area. To detect an earthquake, we calculated a semblance of observed waveforms about all the grid points. A resolution of a hypocenter of an earthquake detected by this method depends on a size of spacing. This method is applicable for a detection of a foreshock activity by watching a specified area and a separation of earthquakes such as swarm earthquakes or an aftershock activity.
We applied the method to test the performance and stability: First we used data from a controlled source experiment conducted in the northern Fossa Magna, where we carried out reflection profiling in 1997. We could evaluate the method with a known location of seismic source. Next we applied the method to data obtained by a telemetered seismic observation at Nikko-Ashio area. We found that the method worked well to detect small event in real data.
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