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2014年2月12日于田MS7.3级地震前后的微震活动集中区及对地震危险区的可能指示
胡朝忠1) 陈丹1) 杨攀新1) 熊仁伟1) 李长军2)
1) 中国地震局地震预测研究所,北京 100036;2) 中国地震局第二监测中心,西安 710054
摘要:
2001年以来,在巴颜喀喇地块周缘相继发生2001年昆仑山8.1级地震、2008年汶川7.8级地震、2010年玉树7.1级地震、2012年芦山7级地震等。对比分析昆仑山8.1级地震前、后相同时间长度内,与其地球动力学上相关区域的地震应变释放强度变化特征,发现该地震发生之后,龙门山地区、巴塘地区、温泉盆地西侧南北向谷地的地震应变释放明显增强。第一个地区发生了汶川地震,第二个地区与玉树地震的发生相关。说明巴颜喀喇地块北边界东昆仑断裂带上发生地震破裂后,其南侧的物质向东南运移,将构造变形集中在龙门山构造带上,并在其上发生破裂。该震例说明基于地震地质背景分析、找出的地球动力学上相关联的地震活动增强区域可能是中长期破坏性地震的易发区。2014年2月12日新疆于田发生MS7.3级地震后,阿尔金断裂带东部与祁连山构造带交汇地区的地震频度和地震应变释放明显增强,该区域的中长期地震危险性值得关注。
关键词:  于田MS7.3级地震  地震应变释放  地震危险区
DOI:
分类号:
基金项目:
Microseismic Concentration Zones before and after the February 12, 2014 MS 7. 3 Yutian Earthquake and the Possible Indication of an Earthquake Risk Zone
Hu Chaozhong1 ),Chen Dan1 ),Yang Panxin1 ),Xiong Renwei1 ),and Li Zhangjun2 )
1) Institute of Earthquake Science,CEA,Beijing 100036,China;2) Second Monitoring and Application Center,CEA,Xi'an 710054,China
Abstract:
Since 2001,there have occurred in succession the 2001 Kunlun Mountains MS8. 1 earthquake,the 2008 Wenchuan MS 8. 0 earthquake,the 2010 Yushu MS 7. 1 earthquake and the 2012 Lushan MS 7. 0 earthquake in the periphery of the Bayan Har block. By comparison of the characteristics of seismic strain release variations before and after the Kunlun Mountains MS8. 1 earthquake in the same time length in the geodynamical related regions,we found that the seismic strain release was obviously enhanced after the earthquake in the Longmenshan area,Batang area,and the NS-trending valleys at the west of the Hot Spring Basin. The Wenchuan earthquake occurred in the first area,and the Yushu earthquake is related to the second area. After the earthquake rupture occurred on the East Kunlun fault zone on the northern boundary of the Bayan Har Block,crustal materials on the south side of the fault zone migrated to the southeast,leading to a concentration of tectonic deformation in the Longmenshan thrust belt, eventually rupturing on the Longmenshan thrust belt. This earthquake case illustrates that seismicity enhancement zones are possibly prone to long-term destructive earthquakes. After the MS7. 3 earthquake in Yutian,Xinjiang on February 12,2014,earthquake frequency and seismic strain release markedly increased in the junction area between the eastern Qilian Mountain tectonic belt and the Altun Tagh fault zone,where more attention should be paid to the long-term seismic risk.
Key words:  Seismic risk zone  Seismic strain release Yutian MS7.3 earthquake