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| 采矿诱发地震的震源机制特征——以辽宁省抚顺市老虎台煤矿为例 | |
| 引用本文： | 李铁,蔡美峰,左艳,刘跃权.采矿诱发地震的震源机制特征——以辽宁省抚顺市老虎台煤矿为例[J].地质通报,2005,24(2):136-144. |
| 作者姓名： | 李铁 蔡美峰 左艳 刘跃权 |
| 作者单位： | 1. 北京科技大学土木与环境工程学院,北京,100083;抚顺市地震局,辽宁,抚顺,113006 2. 北京科技大学土木与环境工程学院,北京,100083 3. 抚顺市地震局,辽宁,抚顺,113006 |
| 基金项目： | 国家自然科学基金项目(40244021)、科技部科研院所社会公益研究专项资金项目(2001DIB20107)资助. |
| 摘 要： | 为探索采矿诱发地震(简称矿震)孕育的机理，以抚顺老虎台煤矿为例，基于双力偶点源的震源模型理论，用地震波P波初动方法，求解出27个较强矿震的震源机制。结合区域强地震震源机制解、地方震小震综合断层面解和极近场矿震震源调查。分析矿震的孕育环境。发现老虎台煤矿矿震与该区域天然地震的震源机制差异明显。得出卸荷产生的次生应力场是孕育矿震的主要应力来源、卸荷重力应力场诱发作用突出的结论。对非双力偶型矿震提出了煤柱失稳和顶板较大规模下沉2种新的解释。提出了减轻矿震的途径。 |
| 关 键 词： | 采矿诱发地震 震源机制 卸荷 重力应力场 |
| 文章编号： | 1671-2552(2005)02-0136-09 |
| 修稿时间： | 2003年8月11日 |
Features of focal mechanisms of mining-induced earthquakes: a case study of the Fushun Laohutai coal mine, Liaoning Province |
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| LI Tie,CAI Meifeng,ZUO Yan,LIU Yuequan. School of Civil and Environmental Engineering,Beijing University of Science and Technology,Beijing,Chin,. Fushun Municipal Seismological Bureau,Fushun,Liaoning,China.Features of focal mechanisms of mining-induced earthquakes: a case study of the Fushun Laohutai coal mine, Liaoning Province[J].Geologcal Bulletin OF China,2005,24(2):136-144. | |
| Authors: | LI Tie CAI Meifeng ZUO Yan LIU Yuequan School of Civil and Environmental Engineering Beijing University of Science and Technology Beijing Chin Fushun Municipal Seismological Bureau Fushun Liaoning China |
| Abstract: | In order to explore the seismogenic mechanism of mining-induced earthquakes, taking for example the Fushun Laohutai coal mine, based on the focal model theory of the double couple point source and by using the P-wave first motion method, the focal mechanisms of 27 stronger mining-induced earthquakes are solved. According to these focal mechanisms, combined with the focal mechanism solution of regional strong earthquakes, composite fault plane solution of natural local small earthquakes and mining-induced earthquake source investigation at the nearest field, the seismogenic conditions of mining-induced earthquakes are analyzed. The authors find that there is appreciable difference in focal mechanism between mining-induced earthquakes in the Laohutai coal mine and natural earthquakes of the region. Thus it is concluded that the secondary stress field produced by unloading is primary stress source inducing mine earthquakes and that unloaded gravity stress field plays a prominent role in inducing the seismogenic process. Two kinds of new explanation of non-double-couple mining-induced earthquakes are advanced: instability of coal pillars and large-scale roof weighting. Ways of reducing mining-induced earthquakes are proposed. |
| Keywords: | mining-induced earthquake focal mechanism unload gravity stress field |
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