唐兰兰,张艺峰,姚道平. 2021. 天山中段地区重复地震时空特征研究. 地震学报,43(5):551−568. doi: 10.11939/jass.20200192
引用本文: 唐兰兰,张艺峰,姚道平. 2021. 天山中段地区重复地震时空特征研究. 地震学报,43(5):551−568. doi: 10.11939/jass.20200192
Tang L L,Zhang Y F,Yao D P. 2021. Spatio-temporal characteristics of repeating seismic events in the middle of Tianshan orogenic belt. Acta Seismologica Sinica43(5):551−568. doi: 10.11939/jass.20200192
Citation: Tang L L,Zhang Y F,Yao D P. 2021. Spatio-temporal characteristics of repeating seismic events in the middle of Tianshan orogenic belt. Acta Seismologica Sinica43(5):551−568. doi: 10.11939/jass.20200192

天山中段地区重复地震时空特征研究

Spatio-temporal characteristics of repeating seismic events in the middle of Tianshan orogenic belt

  • 摘要: 基于2009—2017年新疆区域数字地震台网记录的地震波形数据,利用波形互相关技术及主事件定位方法识别并重新定位了新疆天山中段及其周缘的重复地震。以波形互相关系数0.9作为阈值来确定研究区的重复地震事件,统计结果显示3万零181个事件中的1万1 618个为重复地震事件,这些重复地震事件组成了2395组重复地震对和重复地震丛,占总事件数的38.5%。根据重复地震重定位前后地震对之间距离的统计结果推测,该区域的系统定位误差约为5—10 km。进一步结合该区域最新的震源分类结果对不同震源类型重复地震的时空分布特征予以分析,结果显示:重复矿山爆破事件在空间上呈丛集性分布,且其中的93.6%发生于白天,同时呈现季节性发生模式,即爆破多发生于夏季,而冬季较少;而重复构造地震在空间上大多沿断层分布,24小时内呈随机分布的特征,且研究时段内每个月的活动水平相对平稳;重复诱发地震成丛分布于靠近油气田和水库的区域,但其中部分诱发地震的位置与构造地震重叠,发震时间特征与构造地震相似,为随机分布。

     

    Abstract: Based on the seismic waveform data recorded in the stations of Xinjiang regional seismic network from 2009 to 2017, the repeating earthquakes in the middle of Tianshan orogenic belt and its periphery in Xinjiang were determined and relocated by using the waveform cross correlation technique and the master event approach. The results show that 11 618 of the 30 181 events are repeating events, which consist of 2395 groups of doublets and clusters, accounting for 38.5% of the total events. According to the statistical results of the distance between doublets before and after repeating events relocation, it is estimated that the system location error in the research area is about 5−10 km. In addition, combined with the latest source classification results in this area, the results show that repeating earthquakes of different source types have different spatial and temporal distribution characteristics. Repeating quarry blasts appear mostly as clusters, 93.6% of them occur during the daytime, and they also exhibit a seasonal pattern with more events in summers and fewer ones in winters. Tectonic earthquakes occurred in various thrust faults in the Tianshan orogenic belt, and occurred randomly at any time, and the monthly frequency of tectonic events is relatively stable during the studied period. Repeating induced earthquake locations indicate that most of them are located near large gas/oil fields and water reservoirs, but some also geographically overlay tectonic earthquakes in some regions. The occurring time characteristics of induced earthquakes are similar to those of tectonic earthquakes, which appears as random distribution within 24 hours.

     

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