巴楚—伽师M_S6.8地震地磁异常特点分析
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摘要
通过分析、比较1996—2003年喀什地震台站记录到的新疆伽师及附近地区发生的多次6级地震的地磁前兆异常特征,发现在这几组地震活动过程中喀什地震台的地磁表现出不同的异常特征,说明与地震破裂特征有更深层次的相关性,且地磁响应比异常和总强度差值异常在一定程度上反映了台站周围小范围的震源区介质电性结构的变化。巴楚—伽师6.8级地震前地磁异常特征并不十分突出,有别于1996—1998年伽师强震群震前地磁异常量较丰富的特点。
By analyzing and comparing the abnormal characteristics of geomagnetic prognostic between the Jiashi earthquake and many earthquakes with M_S6.0 of its adjacent area from 1996 to 2003 at Kashi station, we found that the geomagnetic of Kashi station appeared different abnormal characteristics in several seismic activity processes. It shows that it has cosely relativity with the characteristics of the earthquake rupture. And the anomalies between the geomagnetic load/unload response ratio and the difference of the total field reflected the variation of the media electrical property structure in small range of the focus area around the station. The characteristics of the geomagnetic anomaly aren't very marked before the Bachu-Jiashi earthquake with M_S6.8. It is different from geomagnetic anomalies which are abundant in the Jiashi strong swarm from 1996 to 1998.
By analyzing and comparing the abnormal characteristics of geomagnetic prognostic between the Jiashi earthquake and many earthquakes with M_S6.0 of its adjacent area from 1996 to 2003 at Kashi station, we found that the geomagnetic of Kashi station appeared different abnormal characteristics in several seismic activity processes. It shows that it has cosely relativity with the characteristics of the earthquake rupture. And the anomalies between the geomagnetic load/unload response ratio and the difference of the total field reflected the variation of the media electrical property structure in small range of the focus area around the station. The characteristics of the geomagnetic anomaly aren't very marked before the Bachu-Jiashi earthquake with M_S6.8. It is different from geomagnetic anomalies which are abundant in the Jiashi strong swarm from 1996 to 1998.
引文
[1]朱令人,苏乃秦,杨马陵.1997年新疆伽师强震群及三次成功的临震预报[J].中国地震,1998,14(2):101—115.
[2]周仕勇,许忠淮,陈晓非.伽师强震群震源特征及震源机制力学成因分析[J].地球物理学报,2001,44(5):654—662.
[3]高国英,王筱荣,曲延军.新疆巴楚—伽师6.8级地震序列及震情分析[J].内陆地震,2003,17(2):170—175.
[4]刘启元,陈九辉,李顺成,等.新疆伽师强震群三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,2000,43(3):356—365.
[5]单新建,何玉梅,朱燕,等.伽师强震群震源破裂特征的初步分析[J].地球物理学报,2002,45(3):416—425.
[6]朱燕,史勇军,巴克,等.新疆地区加卸载响应比方法应用研究[J].中国地震,2003,18(4):409—416.
[7]朱燕,巴克,郑黎明,等.喀什地磁垂直分量日变低点时间与地震的关系[J].内陆地震,1997,11(2):178—181.
[8]张流,黄建国,高平.水对岩石变形过程中电阻率变化的影响[J].地震,2003,23(1):8—14.
[2]周仕勇,许忠淮,陈晓非.伽师强震群震源特征及震源机制力学成因分析[J].地球物理学报,2001,44(5):654—662.
[3]高国英,王筱荣,曲延军.新疆巴楚—伽师6.8级地震序列及震情分析[J].内陆地震,2003,17(2):170—175.
[4]刘启元,陈九辉,李顺成,等.新疆伽师强震群三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,2000,43(3):356—365.
[5]单新建,何玉梅,朱燕,等.伽师强震群震源破裂特征的初步分析[J].地球物理学报,2002,45(3):416—425.
[6]朱燕,史勇军,巴克,等.新疆地区加卸载响应比方法应用研究[J].中国地震,2003,18(4):409—416.
[7]朱燕,巴克,郑黎明,等.喀什地磁垂直分量日变低点时间与地震的关系[J].内陆地震,1997,11(2):178—181.
[8]张流,黄建国,高平.水对岩石变形过程中电阻率变化的影响[J].地震,2003,23(1):8—14.
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