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采用基于近远震波形的CAPjoint方法,对2013年3月27日台湾南投M W6.0地震分别进行了单独反演和联合反演,获得了各自的震源机制解及震源深度。其中,联合反演所得的最优双力偶机制解参数为,节面Ⅰ:方位角0°,倾角30°,滑动角78°;节面Ⅱ:方位角193°,倾角60°,滑动角96°;震源深度18km。为了验证联合反演的有效性和可靠性,采用由重抽样理论发展而来的Bootstrap方法,对近远震数据分别进行了重采样,并对其单独反演和联合反演所得的参数进行了统计,验证了联合反演的有效性及稳定性,并发现远震反演震源深度的结果一定程度上受台站分布的影响,若要获得精确的震源深度则需要方位角分布较好的远震台站记录。根据前人对集集地震及车笼埔断层的研究成果以及南投地震的发震断层性质接近车笼埔断层的认识,推测此次地震可能发生在车笼埔断层上。
Based on the CAPjoint method based on the near and far waveforms, the Mv6.0 earthquake in Nantou, Taiwan on March 27, 2013 was separately retrieved and jointly retrieved. Their focal mechanism solutions and focal depths were obtained. Among them, the optimal dual-couple mechanism solution parameters obtained by the joint inversion are: Section Ⅰ: azimuth angle 0 °, dip angle 30 °, sliding angle 78 °; section Ⅱ: azimuth angle 193 °, dip angle 60 °, sliding angle 96 °; focal depth 18km. In order to verify the validity and reliability of the joint inversion, the near-far-earthquake data were resampled using the Bootstrap method developed from the re-sampling theory, and the parameters obtained by inversion and joint inversion Statistics and verification of the effectiveness and stability of joint inversion, and found that the result of teleseismic inversion focal depth to a certain extent by the station distribution, if you want to get accurate depth of the focal point you need to better azimuth distribution Seismic station record. According to the previous research results of the Jiadianpo earthquake and the Changbaopan fault and the understanding of the seismogenic fault of the Nantou earthquake close to the Chezhangpu fault, it is speculated that the earthquake may occur on the Chengtangpu fault.