CAJ | 학술논문

2007年5月5日,西藏阿里地区发生了Mw6．1级地震.本文采用Envisat卫星的升、降轨SAR数据获取地震的精确同震地表位移,然后基于弹性半空间位错模型,分别采用MPSO非线性和最小二乘线性反演算法确定了断层几何参数和滑动分布模型.结果表明,分布式滑动分布模型能较好地解释观测到的InSAR地表形变场.地震发震断层为走向158°、倾角43°的西南倾断层,主要的滑动量集中在7~12km的深度,最大滑动量约0．3m,位于9km的深度.反演给出的地震矩为1．24×1018Nm,与地震学结果相一致.
2007년5월5일,서장아리지구발생료Mw6．1급지진.본문채용Envisat위성적승、강궤SAR수거획취지진적정학동진지표위이,연후기우탄성반공간위착모형,분별채용MPSO비선성화최소이승선성반연산법학정료단층궤하삼수화활동분포모형.결과표명,분포식활동분포모형능교호지해석관측도적InSAR지표형변장.지진발진단층위주향158°、경각43°적서남경단층,주요적활동량집중재7~12km적심도,최대활동량약0．3m,위우9km적심도.반연급출적지진구위1．24×1018Nm,여지진학결과상일치.
On 5th May,2007,a M w 6.1 earthquake occurred in the Al i region,China.In this study, ascending and descending tracks of ASAR images col lected by Envisat satel l ite are employed to derive the precise coseismic surface displacements,then nonl inear MPSO algorithm and l inear least-square method with elastic half-space dislocation model are used to estimate the fault geometry and coseismic sl ip distribution.Our model suggests that the distributed sl ip mode can fit the observations very wel l.The earthquake fault is a normal fault with a strike of 158°,a dip of 43° and dipping to southwest.The sl ip mainly occurs within 7~12 km along the orientation,with a maximum sl ip of 0.3 m at a depth of 9 km.The determined geodetic moment is 1.24×1018 Nm,which is consistent with seismological results.