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  梁向洲,郝圣旺.汶川地震震前与同震断层滑移的比较分析[J].震灾防御技术,2017,12(1):107-114, DOI:10.11899/zzfy20170111.

汶川地震震前与同震断层滑移的比较分析
摘要:    本文利用GPS 观测的1999-2007 年汶川震前3 期地表变形数据和2008 年汶川同震地表变形数据,结合地震位错理论,通过高斯变换和坐标旋转建立断层模型,运用遗传算法,反演了龙门山断裂带断层震前3 期和同震滑动参数。结果表明龙门山断层震前3 期平均走滑位移为-5.39mm,倾向位移为2.66mm,与同震断层滑移相比较,发现震前断层的滑移趋势与同震断层滑移一致,均为逆冲兼右旋的挤压运动。比较震前3 期逆冲方向的滑移量,发现逆冲滑移有加速的现象。并根据震前和同震的断层滑动量估算了汶川地震复发周期。
作者单位
梁向洲 燕山大学建筑工程与力学学院, 河北秦皇岛 066004 
郝圣旺 燕山大学建筑工程与力学学院, 河北秦皇岛 066004 
关  键  词:GPS  断层滑移  震前  同震  汶川地震
DOI:10.11899/zzfy20170111
基金项目:国家自然科学基金(11672258)、河北省自然科学基金(D2015203398)和973 计划(2013CB834100)
收稿日期:2016-04-11
作者简介:梁向洲,男,生于1991 年。硕士研究生。主要从事地震断层滑移与地震前兆的研究。E-mail: liangxiangzhou@foxmail.com
通讯作者:
Comparsion of Pre-earthquake and Coseismic Fault Slip of the 2008 Wenchuan Earthquake
Abstract:      In order to get the acknowledge about the pre-earthquake fault slip and its relationship with coseismic slip of the 2008 Wenchuan Earthquake, this paper inverts the GPS measurements from 1999 to 2007 and the coseismic measurementsto infer the pre-earthquake and coseismic slip characteristics of Longmenshan fault. The earthquake dislocation theory and the genetic algorithm are used in the inversion. It is shown that the mean strike-slip from 1999 to 2007 is about 5.39 mm, and the dip slip is almost 2.66 mm. This pre-earthquake slip tendency is consistent with the coseismic reverse and right-lateral slip. The results of the dip slips occurred in 1999 to 2001, 2001 to 2004 and 2004 to 2007 before the 2008 Wenchuan Earthquake indicatethat the dip slip is accelerating with time. This acceleration slip may be a precursor of earthquake. Finally, based on the inversion results of the pre-earthquanke and coseismic fault slip, we estimate the recurrence period of Wenchuan earthquake.
Keywords:  GPS  Fault slip  Pre-earthquake  Coseisimic  Wenchuan Earthquake
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