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2013年前郭震群5次MS≥5.0地震远场地震波辐射能特征研究
孟令媛 韩颜颜* 周龙泉
中国地震台网中心, 北京市西城区三里河南横街5号 100045
摘要:
2013年吉林松原前郭震群是一次典型的爆发式强震群活动,前郭震群MS≥5.0的5次主要地震事件呈现出了较为特殊的起伏特征。本文基于震源谱理论及震群型地震的特点,研究了该震群5次主要地震事件的远场地震波辐射能的特征。选取国家级台站长春台(CN2),针对前郭震群的地震动观测记录,分析观测记录的时间域、频率域特征,结合考虑震群型地震地震动谱和震源谱参数的关系,计算5次地震事件的远场地震波辐射能,并进一步定量化地描述其在震源谱及地震波辐射能等方面的差异。研究结果表明,前郭震群中5次主要地震事件的第2次地震事件(No.2)为整个震群的转折点,其震级上表现出来的衰减特征与其地震波能量释放特征呈现出了明显的非一致性;实际上,No.2事件是前郭震群中最重要的一次事件,主要表现为相对低的震级和相对高的远场地震波辐射能。
关键词:  前郭震群  震源谱  地震动谱  远场地震波辐射能  单台视应力
DOI:
分类号:
基金项目:
Characteristics of Far-field Seismic Radiated Energy from the Five Earthquakes with MS≥5. 0 in the Earthquake Swarm Sequence of 2013,MS5. 8,Qianguo,Jilin Province,China
Meng Lingyuan,Han Yanyan* and Zhou Longquan
China Earthquake Networks Center,Beijing 100045,China
Abstract:
The Qianguo MS5. 8 earthquake swarm of 2013 occurred in Qianguo,Jilin Province, China. There are five earthquakes with MS≥5. 0 in the Qianguo earthquake swarm,with magnitudes of MS 5. 5,MS 5. 0,MS 5. 3,MS 5. 8 and MS 5. 0. In this study,the far-field seismic radiated energy characteristics of the earthquakes are compared based on the source spectrum and the ground motion spectrum of the earthquake swarm. The ground motion spectrum of the five earthquakes at Changchun seismic station (CN2),which is the national standard station,is first investigated with the recorded ground motions,and then the far-field seismic radiated energy is calculated and combined with the relationships of the source spectrum to describe the variable characteristics of the Qianguo earthquake swarm. Research results indicate that the second earthquake (No. 2) with MS5. 0 is the key event of the earthquake swarm,which occurred on October 31,the same day following the first MS5. 5 earthquake (No.1). In fact,the magnitude of event No. 2 decreased compared to event No.1,which did not agree with its large far-field seismic radiated energy. It needs to be pointed out that event No. 2 was the turning point event of the Qianguo earthquake swarm,as being a significant transition before the largest MS5. 8 earthquake.
Key words:  Qianguo earthquake swarm  Source spectrum  Ground motion spectrum  Far-field seismic radiated energy  Signal-station apparent stress