| Project/Area Number |
13640423
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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 | HIROSHIMA UNIVERSITY |
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Principal Investigator |
SUDA Naoki Hiroshima Univ., Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (10222069)
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| Project Period (FY) |
2001 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
|
| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | slow earthquake / Earth's free oscillation / IRIS / GEOSCOPE / IDA / 常時地球自由振動 / GSN |
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| Research Abstract |
We analyzed continuous vertical-component records for 10-year period from 1990 to 1999 at 30 quiet seismic stations of IRIS GSN and GEOSCOPE networks and examined excitation of 27 fundamental spheroidal modes OS17-OS43 of the Earth's free oscillations. We performed a statistical test at time step of 3~hours. Our statistical test was based on that of Beroza & Jordan (1990), but we utilized a different test statistic and a numerical method for mode detection. We made time variation plots for the achieved significance level of event occurrence and visually inspected unknown events. As a result we detected 27 unknown events in seismically quiet intervals.
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