| 山西大同盆地震源机制解矛盾符号比及波速比变化的研究 |
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| 引用本文： | 啜永清,宋美琴.山西大同盆地震源机制解矛盾符号比及波速比变化的研究[J].山西地震,2002(2):1-3,13. |
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| 作者姓名： | 啜永清 宋美琴 |
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| 作者单位： | 1. 山西省地震局,山西,太原,030002
2. 山西省地震局太原基准地震台,山西,太原,030025 |
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| 基金项目： | 地震科学联合基金课题“1 0 0 0 0 2”的部分工作 |
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| 摘 要： | 选用山西地区 1990年至 2 0 0 1年 12 a的地震资料 ,采用格点尝试法、和达法分别计算了山西大同盆地震源机制解的各有关参数及平均波速比 ,探讨了该区震源机制解各参数及平均波速比在中强震前后的变化规律 ,得出山西大同盆地震源机制解矛盾符号比及波速比在主压应力 P轴取向稳定的条件下同步降低的负异常 ,与该区中强地震有一定的对应关系的结论。
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| 关 键 词： | 震源机制 波速比 大同盆地 |
| 文章编号： | 1000-6265(2002)02-0001-04 |
Study on Ratio of Inconsistent Onset Polarity in Source Mechanism Solution and Variation of Wave Velocity for Datong Basin |
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| CHUAI Yong qing ,SONG Mei qin.Study on Ratio of Inconsistent Onset Polarity in Source Mechanism Solution and Variation of Wave Velocity for Datong Basin[J].Earthquake Research in Shanxi,2002(2):1-3,13. |
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| Authors: | CHUAI Yong qing SONG Mei qin |
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| Institution: | CHUAI Yong qing 1,SONG Mei qin 2 |
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| Abstract: | Based on the seismic data of Shanxi from year 1990 to 2001, the source mechanism solution and the average ratio of wave velocity for Datong basin are worked out by using trial and error procedure on a grid and Wadati diagram,respectively. From variation in source mechanism solution and the average ratio of wave velocity before and after earthquakes, we conclude that under condition of unchanged direction of principle pressure stress P axis , the ratio of inconsistent onset polarity in source mechanism solution and the ratio of wave velocity for Datong basin decline synchronously as the negative anomalies ,which correspond to medium-strong earthquakes in the region more or less. |
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| Keywords: | Source mechanism Vp/Vs ratio Datong basin |
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