青海茫崖5.0级地震震源区微震检测与序列活动特征分析
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地震科技星火计划项目(XH19043)


Detection of Missing Earthquakes and Activity Characteristics of the Mangya M5.0 Earthquake Sequence in Qinghai
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    摘要:

    以2019年3月28日青海茫崖5.0级地震作为研究震例,选取主震后信噪比较高的9个ML1.0以上余震作为模板事件,利用模板匹配滤波方法对主震后30天连续波形进行遗漏地震扫描,检测到遗漏地震13个,约为原始地震目录的43%,这对该地区的地震活动性研究,地震危险性评估等后续研究工作提供了比较完备余震序列数据参考。对模板匹配前后b值变化进行对比分析,发现模板匹配后b值略有下降,佐证了强震后短时间内b值明显降低的普遍现象。最后对扩充后的地震目录进行双差重定位,发现地震主要集中分布在茫崖—油沙山断裂北侧,呈现出成团成片的丛集状分布特点。

    Abstract:

    The Mangya M5.0 earthquake that occurred in Qinghai Province on March 28, 2019, was taken as a study example, and nine aftershocks (ML≥1.0) with a high signal-noise ratio after the mainshock were selected as template events. A template-matched technique was used to scan the continuous waveform that occurred in 30 days after the mainshock. Results showed that 13 earthquakes were missed, and they were about 43% of the original earthquake catalog. This work could provide relatively complete aftershock sequence data for the following studies on seismicity or seismic risk assessment in the study area. The comparison of the change in b value before and after template matching revealed that b value decreased slightly after template matching. This result confirmed that b value commonly decreases in a short time after strong earthquakes occur. The extended catalog repositioned with a double difference technique revealed that earthquakes were mainly distributed in the north side of the Mangya-Youshashan fault, showing the characteristics of a clustered distribution.

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胡涛,陈继锋,杨立明,马建新.青海茫崖5.0级地震震源区微震检测与序列活动特征分析[J].地震工程学报,2020,42(4):941-947. HU Tao, CHEN Jifeng, YANG Liming, MA Jianxin. Detection of Missing Earthquakes and Activity Characteristics of the Mangya M5.0 Earthquake Sequence in Qinghai[J]. China Earthquake Engineering Journal,2020,42(4):941-947.

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  • 收稿日期:2019-05-05
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  • 在线发布日期: 2020-08-18