昆仑山口西8.1级地震对鲜水河断裂带断层活动的影响
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摘要
利用1981年以来鲜水河断裂带跨断层短水准、短基线观测资料,计算多年来断层的水平扭错、水平张压以及垂直升降变化量,以此分析各测点断层随时间推移的活动习性。认为:昆仑山口西8.1级地震后,鲜水河断裂带中南段断层的走滑和张压活动分量有所改变,垂直升降活动变化则不明显。中段的沟普测点扭错活动量在逐渐减小,类似道孚6.9级地震后扭错活动逐步衰减的趋势,该测点1997年后结束了的压性活动,在2002～2005年间快速逼近"闭锁",直至2006～2007年间改变了多年的活动习性,出现张性活动趋势。同样,以左旋扭错为主的老乾宁测点在该时间段内也改变了多年的断层活动习性,出现右旋运动趋势。
In this paper,we calculate the torsion,tension and vertical deformation of the Xianshuihe fault over the years and discuss the fault activity behavior on the basis of deformation of the measuring point along the fault based on the observational data of short leveling and baseline along the Xianshuihe fault since 1981.The results show that the torsion and tension deformation has changed a little,but vertical deformation is not obvious along the the middle-south segment of Xianshuihe fault after the Kunlun Mountain MS8.1 Earthquake.The decreased torsion deformation at the Goupu measuring point in the middle segment is similar to that of the Daofu MS6.9 earthquake.Compressive activity of the fault had consummated after 1997,drawn on to the fault locking status with a high-speed from 2002 to 2005.Till 2006 to 2007,its activity behavior of years changed and tensional activity trend showed up.Also,the left-lateral distortion deformation in the Laoqianning measuring point also changed and the right-lateral distortion deformation trend has come into being.
In this paper,we calculate the torsion,tension and vertical deformation of the Xianshuihe fault over the years and discuss the fault activity behavior on the basis of deformation of the measuring point along the fault based on the observational data of short leveling and baseline along the Xianshuihe fault since 1981.The results show that the torsion and tension deformation has changed a little,but vertical deformation is not obvious along the the middle-south segment of Xianshuihe fault after the Kunlun Mountain MS8.1 Earthquake.The decreased torsion deformation at the Goupu measuring point in the middle segment is similar to that of the Daofu MS6.9 earthquake.Compressive activity of the fault had consummated after 1997,drawn on to the fault locking status with a high-speed from 2002 to 2005.Till 2006 to 2007,its activity behavior of years changed and tensional activity trend showed up.Also,the left-lateral distortion deformation in the Laoqianning measuring point also changed and the right-lateral distortion deformation trend has come into being.
引文
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皇甫岗,李忠华,秦嘉政,等.2007.川滇菱形块体强震活动关联分析[J].地震研究,30(3):205-209.
李杰,赵金花.2001.苍山5.2级地震前后沂沐断裂带地壳垂直形变时空动态演化特征[J].地震研究,24(4):307-314.
陆明勇,牛安福,白长清,等.2006..地壳形变短临异常与地下水位短临异常识别方法的初步研究[J].地震研究,29(1):13-20.
吕弋培,李铁明,廖华.1997.鲜水河断裂带跨断层形变测量及其地震学意义[J].地震地质,19(4):333-340.
吕弋培,廖华.2001.鲜水河断裂形变场、重力场、磁场动态演化特征与地震[J].四川地震,(3):11-16.
苏琴.2005.川滇菱形块体垂直形变速率[J].四川地震,(1):43-46.
王永安,刘强,王世芹.2004.丽江7.0级地震前断层形变累积率的变化特征[J].地震研究,27(1):61-65.
闻学泽.2000.四川西部鲜水河—安宁河—则木河断裂带的地震破裂分段特征[J].地震地质,22(3):239-249.
晓羲.1994.功能最强的科学图形工具用户指南GRAFTOOL[M].北京:学苑出版社.
燕乃玲,潘纪顺,郭玉莲,等.2001.沂沐带形变、重磁场时空变化特征与地震活动[J].地震研究,24(2):126-130.
杨永林,苏琴.2007.鲜水河断裂带现今活动研究[J].大地测量与地球动力学,27(6):24-27.
张希,江在森,王双绪,等.2005.川滇地区现今块体水平运动变形的弹性块体边界负位错模型与强震地点预测[J].地震研究,28(1):119-124.
张希,张四新,王双绪.2004.昆仑山口西8.1级地震前后地壳身残志坚运动的负位错模型[J].地震研究,27(2):153-157.
张晓亮,江在森,王双绪,等.2005.川滇地区现今块体水平运动变形特征分析[J].地震研究,28(3):262-267.
张永久,乔慧珍,程万正,等.2007.四川盆地区域介质衰减特征研究[J].地震研究,30(1):43-48.
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