文章摘要
尹欣欣,曾文浩,李少华,赵林林,蒲举,高永国.青海祁连MS5.2地震微震检测与目录完备性研究[J].地震工程学报,2019,41(1):183-188. YIN Xinxin,ZENG Wenhao,LI Shaohua,ZHAO Linlin,PU Ju,GAO Yongguo.Missing Earthquakes Detection and Completeness of EarthquakeCatalogs of the 2015 Qilian, Qinghai MS5.2 Earthquake[J].China Earthquake Engineering Journal,2019,41(1):183-188.
青海祁连MS5.2地震微震检测与目录完备性研究
Missing Earthquakes Detection and Completeness of EarthquakeCatalogs of the 2015 Qilian, Qinghai MS5.2 Earthquake
投稿时间:2018-07-14  
DOI:10.3969/j.issn.1000-0844.2019.01.183
中文关键词: 目录完备性;匹配滤波;遗漏地震;祁连MS5.2地震
英文关键词: completeness of catalogs;matched filter;missing earthquakes;Qilian MS5.2 earthquake
基金项目:中国地震局地震预测研究所基本科研业务费专项(2015IESLZ04);中国地震局地震科技星火计划项目(XH19043);中国地震局测震台网青年骨干专项课题(20170624)
作者单位E-mail
尹欣欣 中国地震局兰州地震研究所, 甘肃 兰州 730000
甘肃省地震局, 甘肃 兰州 730000 
 
曾文浩 中国地震局兰州地震研究所, 甘肃 兰州 730000 Zengwh@gsdzj.gov.cn 
李少华 中国地震局兰州地震研究所, 甘肃 兰州 730000  
赵林林 中国地震局兰州地震研究所, 甘肃 兰州 730000  
蒲举 中国地震局兰州地震研究所, 甘肃 兰州 730000  
高永国 中国地震局兰州地震研究所, 甘肃 兰州 730000  
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中文摘要:
      利用模板匹配方法对2015年11月23日青海省祁连县MS5.2地震进行遗漏地震检测研究,由于主震后短时间内目录中遗漏事件较多,故对主震后1天的连续波形进行检测。主震后1天内青海测震台网记录到的余震个数(包括单台)共62个,选取主震后ML1.0以上余震30个作为模板事件,通过匹配滤波的方式扫描出遗漏地震31个,约为台网目录给出的0.5倍。基于包络差峰值振幅与震级的线性关系估测检测事件的震级参数,最后将检测后的余震目录与台网余震目录在主震后1天内的最小完备震级进行对比分析,结果发现检测后最小完备震级从ML1.2降到了ML0.7,得到青海测震台网在祁连地区最小完整性震级为ML0.7。
英文摘要:
      This paper used a template matching technique to detect missing earthquakes of the Qilian, Qinghai MS5.2 earthquake that occurred on November 23, 2015. In existing catalogs, aftershock sequence data, especially from the short time after the main shock, are usually huge so we detected continual waveforms one day after the mainshock. In that day, the seismic network recorded 62 aftershocks, including single-station earthquakes. In this study, we chose 30 ML>1.0 aftershocks as the templates, and finally found 31 missing earthquakes after detection, which was about 0.5 times the number given by the network catalog. According to the linear fitting relationship between frequency envelope difference amplitude and magnitude, we estimated the magnitude of detected events. We then compared the minimum magnitude of completeness (MC) before and after detection within one day of mainshock, and found that the minimum magnitude of completeness was reduced from ML1.2 to ML0.7, showing that the minimum magnitude of completeness in the Qilian area of the Qinghai Seismic Network was about ML0.7. In addition, the b value of seismicity decreased slightly after the detection, and the results showed that the b value decreased markedly within a short time after the mainshock. Using the template matching method can effectively reduce the number of loss events caused by the earthquake coda wave interference, and improve the capability of seismic detection. The b value of further accurate calculations of earthquake aftershocks can help us better track earthquake activity.
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