2012年10月31日三峡库区M_L3.8小震群研究
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摘要
对2012年10月31日三峡库区屈原镇ML3.8小震群活动的研究表明,是一次与三峡水库蓄水过程直接相关震群活动;地震主要聚集在仙女山断裂带北端,深约10 km,分布在结晶基底附近;震源体的线性尺度较小,主要限定在5 km的范围;主震和较大地震表现为较典型的构造型地震特征;震群活动为水库高水位蓄水引发仙女山断裂北端构造应力调整,其震群为水库触发型构造地震。
The largest magnitude is ML3.8 small earthquake swarm which occurred on October 30,2012,Quyuan town of Zigui County in the Three Gorges reservoir region.The studies show that the small earthquake swarm are directly related to the Three Gorges Reservoir impounding;the earthquake swarm gathered in the northern end of Xiannvshan fault zone,earthquakes most located within 10 km near the crystalline basement;linear scale of hypocenter body is smaller,mainly limited radius of 5 km of range;mainshock and larger seismic performance typical stereotype earthquake characteristics;earthquake swarm triggered the fault structure Xiannvshan stress to adjust in the high water level of the reservoir impounding,small earthquake swarm are reservoir triggered tectonic earthquakes.
The largest magnitude is ML3.8 small earthquake swarm which occurred on October 30,2012,Quyuan town of Zigui County in the Three Gorges reservoir region.The studies show that the small earthquake swarm are directly related to the Three Gorges Reservoir impounding;the earthquake swarm gathered in the northern end of Xiannvshan fault zone,earthquakes most located within 10 km near the crystalline basement;linear scale of hypocenter body is smaller,mainly limited radius of 5 km of range;mainshock and larger seismic performance typical stereotype earthquake characteristics;earthquake swarm triggered the fault structure Xiannvshan stress to adjust in the high water level of the reservoir impounding,small earthquake swarm are reservoir triggered tectonic earthquakes.
引文
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10中国地震局监测预报司.中国大陆地震序列研究[M].北京:地震出版社,2007.(China Seismological Bureau ofMonitoring and Prediction department.Chinese mainlandearthquake sequence research[M].Beijing:EarthquakePress,2007)
2陈俊华,等.秭归罗圈荒地区微震群事件分析[J].大地测量与地球动力学,2009,(6):45-48.(Chen Junhua,et al.Analysis of micro-earthquake Swarms in Luoquanhuang areaof Zigui country[J].Journal of Geodesy and Geodynamics,2009,(6):45-48)
3王秋月,朱守彪.库水载荷对水库触发地震的机制研究[J].大地测量与地球动力学,2010,30(增):17-25.(Wang Qiuyue and Zhu Shoubiao.Study on triggering mech-anism of reservoir earthquake by water impoundment[J].Journal of Geodesy and Geodynamics,2010,(Sup.):17-25)
4胡祚春,郑治真,刘元状.滑坡、塌陷与地震的波谱差异[J].地震研究,1985,8(2):179-188.(Hu Zuochun,Zheng Zhizhen and Liu Yuanzhuang.Spectral differences oflandslide,collapse and earthquake[J].Journal of Seismolog-ical Research,1985,8(2):179-188)
5吴海波,姚运生,薛军蓉.长江三峡地区地震事件频谱特征及分类问题探讨[J].大地测量与地球动力学,2010,(增):10-15.(Wu Haibo,Yao Yunsheng and Xue Jun-rong.Discuss of frequency spectrum characteristics andclassfied problem of seismic event on Three Gorges[J].Jour-nal of Geodesy and Geodynamics,2010,(Sup.):10-15)
6张丽芬,等.湖北秭归罗圈荒微震群的成因及其类型鉴别[J].地震研究,2008,31(3):222-227.(Zhang Lifen,etal.Genesis and type identification of Luoquanhuang micro-quake swarm in Zigui,Hubei[J].Journal of SeismologicalResearch,2008,31(3),222-227)
7于海英,等.水库地震的地震动特性[J].自然灾害学报,2006,15(5):188-193.(Yu Haiying,et al.Characteristicof ground motion of reservoir earthquake[J].Journal of Nat-ural Disasters,2006,15(5):188-193)
8狄莉莎,陈俊华.长江三峡地区巴东野三关地震成因探讨[J].大地测量与地球动力学,2007,(专刊):62-67.(DiLisha and Chen Junhua.On genesi of Yesanguan micro earth-quakes in Three Gorges area on Yangtze river[J].Journal ofGeodesy and Geodynamics,2007,(Spe.):62-67.
9张丽芬,等.三峡库区构造和塌陷地震的拐角频率特征[J].大地测量与地球动力学,2013,(2):27-30.(ZhangLifen,et al.Corner frequency Characteristic of Tectonicearthquakes and Collapsed ones in Three Gorges Region[J].Journal of Geodesy and Geodynamics,2013,(2):27-30)
10中国地震局监测预报司.中国大陆地震序列研究[M].北京:地震出版社,2007.(China Seismological Bureau ofMonitoring and Prediction department.Chinese mainlandearthquake sequence research[M].Beijing:EarthquakePress,2007)
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