The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake
碩士 === 國立中正大學 === 地震研究所 === 99 === Earthquake early warning has become an important task in seismic hazard prevention. The purpose of this research is to use intrinsic attenuation of dispersive P-wave, Qp, to serve as an earthquake precursor. On November 5, 2009, an earthquake (ML=6.3; depth=24km)...
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ndltd-TW-099CCU001400032015-10-13T20:04:04Z http://ndltd.ncl.edu.tw/handle/08642608702287693026 The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake 由P波頻散特性探討南投名間地震事件 Yu-Zhe Ji 紀毓哲 碩士 國立中正大學 地震研究所 99 Earthquake early warning has become an important task in seismic hazard prevention. The purpose of this research is to use intrinsic attenuation of dispersive P-wave, Qp, to serve as an earthquake precursor. On November 5, 2009, an earthquake (ML=6.3; depth=24km) occurred in Mingjian, Nantau area, Taiwan. Vertical-component of first-cycle P-wave data recorded by the CWBSN (the Central Weather Bureau Seismic Network) from 2009/01 to 2009/07 is used to obtain Qp parameter. For better resolution, we have applied the Newton polynomial interpolation method to down sampling the data to interval of 0.001 sec. Then the Multiple Filter Technique is used to obtain frequency-time curve, which leads to an optimized Qp determined by the Genetic algorithm method. Our results indicate that 2-month before the occurrence of an earthquake with ML=5.4, the Qp is beginning to decrease for all stations, which implies that the crustal area becomes more fractured due to highly stress accumulation. We conclude that Qp is very sensitive to the change of stress state and can serve as a key index in earthquake early warning. Chau-Huei Chen 陳朝輝 2011 學位論文 ; thesis 82 zh-TW |
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碩士 === 國立中正大學 === 地震研究所 === 99 === Earthquake early warning has become an important task in seismic hazard prevention. The purpose of this research is to use intrinsic attenuation of dispersive P-wave, Qp, to serve as an earthquake precursor. On November 5, 2009, an earthquake (ML=6.3; depth=24km) occurred in Mingjian, Nantau area, Taiwan. Vertical-component of first-cycle P-wave data recorded by the CWBSN (the Central Weather Bureau Seismic Network) from 2009/01 to 2009/07 is used to obtain Qp parameter. For better resolution, we have applied the Newton polynomial interpolation method to down sampling the data to interval of 0.001 sec. Then the Multiple Filter Technique is used to obtain frequency-time curve, which leads to an optimized Qp determined by the Genetic algorithm method. Our results indicate that 2-month before the occurrence of an earthquake with ML=5.4, the Qp is beginning to decrease for all stations, which implies that the crustal area becomes more fractured due to highly stress accumulation. We conclude that Qp is very sensitive to the change of stress state and can serve as a key index in earthquake early warning.
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author2 |
Chau-Huei Chen |
author_facet |
Chau-Huei Chen Yu-Zhe Ji 紀毓哲 |
author |
Yu-Zhe Ji 紀毓哲 |
spellingShingle |
Yu-Zhe Ji 紀毓哲 The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
author_sort |
Yu-Zhe Ji |
title |
The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
title_short |
The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
title_full |
The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
title_fullStr |
The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
title_full_unstemmed |
The Characteristics of Intrinsic Attenuation of Dispersive P-waves from Studying the 2009/11/05 Nantou Mingjian Earthquake |
title_sort |
characteristics of intrinsic attenuation of dispersive p-waves from studying the 2009/11/05 nantou mingjian earthquake |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/08642608702287693026 |
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