| 2014年安徽金寨ML3.9震群序列震源一致性研究 |
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| 引用本文： | 黄显良,刘泽民,郁建芳,倪红玉,张炳,王琐琛. 2014年安徽金寨ML3.9震群序列震源一致性研究[J]. 地震学报, 2015, 37(6): 916-924. DOI: 10.11939/jass.2015.06.003 |
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| 作者姓名： | 黄显良 刘泽民 郁建芳 倪红玉 张炳 王琐琛 |
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| 作者单位： | 中国合肥 230031 安徽省地震局 |
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| 基金项目： | 中国地震局地震科技星火计划重点项目XH15021青年项目XH13008Y |
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| 摘 要： | 首先采用P波、 SV波和SH波的极性和振幅比联合求解2014年安徽省金寨ML3.9震群序列的震源机制解， 并在此基础上计算得到该震群序列的震源一致性参数和P轴方位角随时间的变化； 然后基于震区附近3个台站记录到的该震群序列的地震波形， 计算其体波谱振幅相关系数， 同时读取震区附近3个台站记录到的该震群序列中115次ML≥1.5地震的极性. 研究结果表明: 金寨ML3.9震群序列的地震震源机制解绝大多数为压性走滑型， P轴方位角较为一致； 其震源一致性参数处于较低水平， 体波谱振幅相关系数较高； 台站所记录到的地震极性也较为一致. 该结果表明金寨ML3.9震群序列的震源一致性程度非常高.
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| 关 键 词： | 金寨ML3.9震群序列 震源机制解 谱振幅相关系数 震源一致性参数 |
| 收稿时间： | 2015-01-05 |
Consistency parameters of focal mechanism for the ML3.9 Jinzhai,Anhui,earthquake swarm sequence in 2014 |
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| Affiliation: | Earthquake Administration of Anhui Province, Hefei 230031, China |
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| Abstract: | The Jinzhai ML3.9 earthquake swarm sequence occurred in Guanmiao town, Jinzhai county, Anhui Province in 2014, which continued in high activity frequency for a long duration. The focal depths of earthquakes in Jinzhai swarm were all shallow and the region was about 5 kilometers. Firstly, the consistency parameters of focal mechanism and the change in P-axis azimuth with time for the Jinzhai sequence have been obtained from the focal mechanism data which were solved by combining the polarity of P, SV and SH waves with their amplitude ratios. Then the correlation coefficients of spectral amplitude of the Jinzhai sequence were calculated based on the seismic waveforms recorded by three stations near the epicenter of Jinzhai ML3.9. And the polarity of first motions of 115 earthquakes with ML≥1.5 recorded by three stations close to the earthquake region had been read at the same time. The results show that the main type of focal mechanism of Jinzhai earthquake swarm sequence is transpressional strike-slipping， and the P-axis azimuth is more consistent for the earthquakes. The consistency parameters of focal mechanism are at a low level, while the correlation coefficient of spectral amplitude are relatively high, and the polarities of first motion recorded by stations are also consistent. All mentioned above suggests that the consistency parameters of focal mechanism of Jinzhai earthquake sequence are in a very high degree. |
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