| 2010年6月广西凌云-凤山交界3级震群应力水平分析 |
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| 引用本文： | 郭培兰,龙政强,阎春恒,陆丽娟,牟剑英.2010年6月广西凌云-凤山交界3级震群应力水平分析[J].华南地震,2014(1):11-20. |
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| 作者姓名： | 郭培兰 龙政强 阎春恒 陆丽娟 牟剑英 |
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| 作者单位： | 广西壮族自治区地震局,广西 南宁530022 |
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| 基金项目： | 基金项目：广西科学研究与技术开发计划项目（桂科攻1140004-2）及广西科学研究与技术开发计划项目（桂科攻10123012-21）课题资助 |
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| 摘 要： | 2010年6月28日至8月15日,在广西凌云与凤山交界持续发生了高密集、高集中、高频率的震群活动,共记录地震3 071次,其中ML2~2.9级地震41次,3级以上地震3次,最大为7月1日10时27分3.2级地震。对此次震群的空间分布范围、2级以上地震震源机制解P轴优势方向、b值特征、应力降等进行了分析研究。结果表明,此次震群震中集中,深度较浅,震源机制解P轴没有形成优势分布,序列参数b值较高,约为1.21,应力降主要分布在0.19~2.0 Mpa之间,认为广西凌云-凤山交界3级震群是属于低应力背景下的地震活动,不具有前兆震群和前震序列的性质。分析结果对正确了解此次震群的特征、正确判断地震趋势具有一定的帮助作用。
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| 关 键 词： | 震群 震源机制解 应力降 震源深度 广西凌云-凤山 |
Stress Level Analysis of Earthquake Swarm with ML 3.0 in the Boundary Area of Lingyun and Fengshan in June 2010 |
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| GUO Peilan,LONG Zhengqiang,YAN Chunheng,LU Lijuan,MOU Jianying.Stress Level Analysis of Earthquake Swarm with ML 3.0 in the Boundary Area of Lingyun and Fengshan in June 2010[J].South China Journal of Seismology,2014(1):11-20. |
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| Authors: | GUO Peilan LONG Zhengqiang YAN Chunheng LU Lijuan MOU Jianying |
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| Institution: | (Earthquake Administration of Guangxi Zhuang Autonomous Region, Narming 530022, China) |
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| Abstract: | From June 28 to April 15 2010, high density, high concentrate, high frequency earthquake swarm occurred in the boundary area of Lingyun and Fengshan in Guangxi, 3 071 earthquakes were recorded, among of them, 41 events with 2.0 ≤ML≤2.9, 3 events with ML≥3.0, the maximum event with ML3.2 occurred in 1st July. The paper analyses the space boundary of earthquake swarm, P axis edge direction of earthquake focus mechanism of events with ML≥2.0, b value characteristic, stress drop. The results show that： the epicenter of earthquake swarm are concentration; the depth is very shallow; earthquake focus mechanism of P axis position haven＆#39;t the predominance distribution; b value is very high, which is about 1.21; stress drop value is mainly distributed between 0.19-2.0 Mpa. We found that M 3.0 earthquake swarm occurred in low stress level in the boundary area of Lingyun and Fengshan, the earthquake swarm don＆#39;t have the precursory earthquake swarm and the foreshock sequence. These results have some helpful for a proper understanding of the characteristics of the earthquake swarm, and the right judging of the earthquake trend. |
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| Keywords: | Earthquake swarm Focal mechanism solutions Stress drop Focal depth Lingyun and Feng shan in Guangxi |
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