汶川与攀枝花地震前地壳垂直运动的负位错模型与孕震背景
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摘要
利用川西地区1990—1997年、1997—2003年及1994—2006年区域水准观测资料,借助负位错反演,研究汶川Ms8.0地震与攀枝花Ms6.1地震前相关及周边断裂的构造变形特征与应变积累背景。分析表明:安宁河断裂北段与鲜水河断裂南段及与龙门山断裂交汇区附近显示与继承性运动背景一致的大范围、显著隆升和长时间尺度(10数年)应变能积累特性,对汶川大震有一定程度反映;而元谋-绿汁江断裂南段1997—2003年应变积累加速特征可能对攀枝花地震有一定程度反映。
By use of the regional leveling observations of the western Sichuan in the periods of 1990—1997,1997—2003 and 1994—2006 and the aid of inversion of negative dislocation,the characteristics of tectonic deformation and strain accumulation background of correlative and neighbor faults before the Wenchuan M s8.0 earthquake and the Panzhihua M s6.1 earthquake are researched.It is concluded that there is obvious uplift in the large region according with its background of successive movement and long-term(over 10 years) strain accumulation on the northern segment of Anninghe fault and the southern segment of Xianshuihe fault and the region they meet Longmenshan fault,reflecting the background of the Wenchuan M s8.0 earthquake to some extent.Moreover,the acceleration of stain accumulation during 1997—2003 on the southern segment of Yuanmou-luzhijiang fault may reflect the background of the Panzhihua M s6.1 earthquake.
By use of the regional leveling observations of the western Sichuan in the periods of 1990—1997,1997—2003 and 1994—2006 and the aid of inversion of negative dislocation,the characteristics of tectonic deformation and strain accumulation background of correlative and neighbor faults before the Wenchuan M s8.0 earthquake and the Panzhihua M s6.1 earthquake are researched.It is concluded that there is obvious uplift in the large region according with its background of successive movement and long-term(over 10 years) strain accumulation on the northern segment of Anninghe fault and the southern segment of Xianshuihe fault and the region they meet Longmenshan fault,reflecting the background of the Wenchuan M s8.0 earthquake to some extent.Moreover,the acceleration of stain accumulation during 1997—2003 on the southern segment of Yuanmou-luzhijiang fault may reflect the background of the Panzhihua M s6.1 earthquake.
引文
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6张希,张四新,王双绪.昆仑山口西8.1级地震前后地壳垂直运动的负位错模型[J].地震研究,2004,27(2):153-158.
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2 Okada Y.Surface deformation due to shear and tensile faultsin a half-space[J].Bulletin of the Seismological Society ofAmerica,1985,75(4):1 135-1 154.
3伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.
4何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.
5张希,等.1999—2001年青藏块体东北缘地壳水平运动的非震反位错模型及变形分析[J].地震学报,2003,25(4):374-381.
6张希,张四新,王双绪.昆仑山口西8.1级地震前后地壳垂直运动的负位错模型[J].地震研究,2004,27(2):153-158.
7张希,等.北祁连-河西地区强震地点预测[J].大地测量与地球动力学,2005,25(1):40-46.
8张希,等.滇西区域水准观测的负位错反演与应变积累分析[J].地震研究,2007,30(3):216-222.
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