2017年12月15日青海泽库M_s4.9地震序列分析
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摘要
2017年12月15日青海泽库发生M_s4.9地震,震中位于北纬35.13°,东经101.87°,该地震是2017年6月唐古拉震群发生半年后青海境内再次发生的显著地震事件。分别从序列特征、区域地质构造、震源机制、视应力等方面对该地震序列进行分析,认为:泽库4.9级地震序列为前震序列的可能性不大,主震震源机制为左旋滑动,两次3级余震震源机制为走滑型,初步推测走向NWW、倾角53°的节面为主震发震断层面,泽库4.9级地震视应力相对偏高,对青海东部地区地壳应力场增强有一定指示意义。
A M_s4.9 earthquake occurred in Zeku county of Qinghai Province on December 15,2017.The epicenter was at 35.13°N,101.87°E.This earthquake was another significant seismic event in Qinghai Province about half a year later after the Tang Gula earthquake group occurred in June,2017.The sequence characteristics,regional geological structure,source mechanism,visual stress and other aspects of the M_s4.9 seismic sequence were analyzed.It is considered that the Qinghai Zeku earthquake sequence is the main residual type.The main earthquake source mechanism is left-handed.The two M3.0 aftershock source mechanism is the strike slip type.And the preliminary judgement of NWW trending may be the main shock.The relatively high apparent stress of the M_s4.9 Zeku earthquake had some certain significance for the enhancement of the crustal stress field in the eastern part of Qinghai Province.
A M_s4.9 earthquake occurred in Zeku county of Qinghai Province on December 15,2017.The epicenter was at 35.13°N,101.87°E.This earthquake was another significant seismic event in Qinghai Province about half a year later after the Tang Gula earthquake group occurred in June,2017.The sequence characteristics,regional geological structure,source mechanism,visual stress and other aspects of the M_s4.9 seismic sequence were analyzed.It is considered that the Qinghai Zeku earthquake sequence is the main residual type.The main earthquake source mechanism is left-handed.The two M3.0 aftershock source mechanism is the strike slip type.And the preliminary judgement of NWW trending may be the main shock.The relatively high apparent stress of the M_s4.9 Zeku earthquake had some certain significance for the enhancement of the crustal stress field in the eastern part of Qinghai Province.
引文
[1]黄帅堂,青海日月山断裂带地震危险性评价及其构造意义[D].中国地震局地震预测研究所硕士论文,2016.
[2]青海省志·地震志(2005)[M].西安:陕西出版传媒集团三秦出版社,2018,09:47.
[3]国家地震局监测预报司.测震学分析预报方法[M].北京:地震出版社,1997:1-204.
[4]国家地震局科技监测司.地震学分析预报方法程式指南[M].北京:地震出版社,1990.
[5]陈学忠,李艳娥.2006年7月4日河北文安M_S5.1地震前震中周围地区小震视应力随时间的变化[J].中国地震,2007,23(4):327-336.
[6]钱晓东,李琼,秦嘉政.2007年宁洱6.4级地震序列视应力研究[J].地震研究,2007,30(4):311-317.
[7]赵凌云,邓津,陈俊华,等.基于CAP方法的震源机制研究[J].长江科学学院院报,2010,27(5):81-84.
[8]胡朝忠,杨攀新,李智敏,等.2016年1月21日青海门源6.4级地震的发震机制探讨[J].地球物理学报,2016,59(5):1637-1646.
[9]吕坚,郑勇,马玉虎,等.2010年4月14日青海玉树M_S4.7、M_S7.1、M_S6.3地震震源机制解与发震构造研究[J].地球物理学进展,2011,26(5):1600-1606.
[2]青海省志·地震志(2005)[M].西安:陕西出版传媒集团三秦出版社,2018,09:47.
[3]国家地震局监测预报司.测震学分析预报方法[M].北京:地震出版社,1997:1-204.
[4]国家地震局科技监测司.地震学分析预报方法程式指南[M].北京:地震出版社,1990.
[5]陈学忠,李艳娥.2006年7月4日河北文安M_S5.1地震前震中周围地区小震视应力随时间的变化[J].中国地震,2007,23(4):327-336.
[6]钱晓东,李琼,秦嘉政.2007年宁洱6.4级地震序列视应力研究[J].地震研究,2007,30(4):311-317.
[7]赵凌云,邓津,陈俊华,等.基于CAP方法的震源机制研究[J].长江科学学院院报,2010,27(5):81-84.
[8]胡朝忠,杨攀新,李智敏,等.2016年1月21日青海门源6.4级地震的发震机制探讨[J].地球物理学报,2016,59(5):1637-1646.
[9]吕坚,郑勇,马玉虎,等.2010年4月14日青海玉树M_S4.7、M_S7.1、M_S6.3地震震源机制解与发震构造研究[J].地球物理学进展,2011,26(5):1600-1606.