2008年10月5日乌恰6.9级地震背景性异常
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摘要
分析总结了2008年10月5日乌恰6.9级地震前背景性异常:1900～2008年新疆6.8级以上地震时空分布表明,于田7.4级地震发生后新疆仍缺少一次6.8级以上地震;2004年12月以来新疆3.5级以上地震累积频次持续低值;乌恰地区6级地震超常平静;2003年以来在乌恰地区形成4级地震空区;2006年以来新疆相继形成2条4级地震条带相交于乌恰地区;2006年1月至2008年7月乌恰台地震波振幅比大范围低值:2007年4月至2008年2月,沿卡兹特阿尔特断裂出现2次符合预报指标的异常增强现象:2008年2月以来喀什台地磁垂直分量拟合差值持续低值:2006年9月以来莎车台土层应力2道测值先后出现偏离正常年变现象。
The background anomalies of Wuqia M_S6.9 earthquake occurred on Oct.5,2008 were analyzed in this paper,including:the space-time distribution of earthquakes with M_S≥6.8 from 1900 to 2008 in Xinjiang shows that there is a lack of M_S6.8 earthquake after Yutian M_S7.4 earthquake in Xinjiang;the accumulation frequency of earthquakes with M_S≥3.5 continued to be low;M_S6.0 earthquakes is anomaly quiescent in Wuqia region;M_S4.0 seismic gap has come into being in Wuqia region since 2003,while two M_S4.0 seismic belts in Xinjiang has come into being and intersecting in Wuqia region since 2006;the amplitude ratios of seismic wave of Wuqia seismic station show low values in a large range from Jan.2006 to Jul.2008;the abnormal phenomenon of seismic activity appeared two times in Kenzitearte fault;the error values of fitted line of vertical geomagnetic component of Kashi station show low values since Feb.2008;the values of two channels of soil stress in Shache station have successively departed from the annual change value since Sep.2006.
The background anomalies of Wuqia M_S6.9 earthquake occurred on Oct.5,2008 were analyzed in this paper,including:the space-time distribution of earthquakes with M_S≥6.8 from 1900 to 2008 in Xinjiang shows that there is a lack of M_S6.8 earthquake after Yutian M_S7.4 earthquake in Xinjiang;the accumulation frequency of earthquakes with M_S≥3.5 continued to be low;M_S6.0 earthquakes is anomaly quiescent in Wuqia region;M_S4.0 seismic gap has come into being in Wuqia region since 2003,while two M_S4.0 seismic belts in Xinjiang has come into being and intersecting in Wuqia region since 2006;the amplitude ratios of seismic wave of Wuqia seismic station show low values in a large range from Jan.2006 to Jul.2008;the abnormal phenomenon of seismic activity appeared two times in Kenzitearte fault;the error values of fitted line of vertical geomagnetic component of Kashi station show low values since Feb.2008;the values of two channels of soil stress in Shache station have successively departed from the annual change value since Sep.2006.
引文
[1]赵瑞斌,卢静芳,杨主恩,等.天山构造带新生代构造变形二维有限元模拟[J].新疆地质,2003,21 (2):151-156.
[2]王有学,姜枚,熊盛青,等.西昆仑岩石圈的拆沉作用及其深部构造含义——地震层析成像及航磁异常证据[J].中国地质,2006,33(2):299-308.
[3]马宗晋.华北地壳的多(应力集中)点场与地震[J].地震地质,1980,2(1):39-48.
[4]王筱荣,李志海.新疆中强震预报的探讨[J].西北地震学报,2008,30(2):132-138.
[5]王筱荣.地震活动关联图与新疆的强震[J].华南地震,2003,23(4):8-17.
[6]王筱荣.新疆强震前地震活动增强研究[J].华南地震,2005,25(1):18-23.
[7]陆远忠,叶金铎,蒋淳,等.中国强震前兆地震活动图像机理的三维数值模拟研究[J].地球物理学报, 2007,50(2):499-508.
[2]王有学,姜枚,熊盛青,等.西昆仑岩石圈的拆沉作用及其深部构造含义——地震层析成像及航磁异常证据[J].中国地质,2006,33(2):299-308.
[3]马宗晋.华北地壳的多(应力集中)点场与地震[J].地震地质,1980,2(1):39-48.
[4]王筱荣,李志海.新疆中强震预报的探讨[J].西北地震学报,2008,30(2):132-138.
[5]王筱荣.地震活动关联图与新疆的强震[J].华南地震,2003,23(4):8-17.
[6]王筱荣.新疆强震前地震活动增强研究[J].华南地震,2005,25(1):18-23.
[7]陆远忠,叶金铎,蒋淳,等.中国强震前兆地震活动图像机理的三维数值模拟研究[J].地球物理学报, 2007,50(2):499-508.
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