CAJ | 학술논문

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3071次，其中ML 2~2.9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。
2010년6월28일지8월15일，재엄서릉운여봉산교계지속발생료고밀집、고집중、고빈솔적진군활동，공기록지진3071차，기중ML 2~2.9급지진41차，3급이상지진3차，최대위7월1일10시27분3.2급지진。대차차진군적공간분포범위、2급이상지진진원궤제해P축우세방향、 b치특정、응력강등진행료분석연구。결과표명，차차진군진중집중，심도교천，진원궤제해P축몰유형성우세분포，서렬삼수b치교고，약위1.21，응력강주요분포재0.19~2.0 Mpa지간，인위엄서릉운-봉산교계3급진군시속우저응력배경하적지진활동，불구유전조진군화전진서렬적성질。분석결과대정학료해차차진군적특정、정학판단지진추세구유일정적방조작용。
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'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'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.