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2002年11月3日,阿拉斯加中部反生了一次M_w7.9级的地震。该地震使部分苏西特纳冰川断层、迪纳利断层及托茨春达断层发生破裂。反演GPS测量的位移场表明,该事件以沿迪纳利断层复杂的右旋走滑破裂占优势。最靠近震中的GPS测点显示出苏西特纳冰川断层有逆冲运动的影响。优选的M_w7.9级地震同震滑动模型表明,在破裂的西段滑动相对较小,而在震中以东约60km至在迪纳利断层和托茨春达断层的交汇处滑动相对较大。我们发现大多数浅层滑动从地表至深15km,但反演却表明在震中以东110km有一大的深部滑移层。我们的模型预示地表滑动与地表地质观测非常一致,模型分辨率也非常好。
On November 3, 2002, an M_w7.9 earthquake hit the middle of Alaska. The earthquake ruptured parts of the Sussena glacier fault, the Denali fault and the Turtaunda fault. The inversion of the GPS-measured displacement field shows that this event predominates with the complex dextral strike-slip faults along the Denali fault. GPS measurements closest to the epicenter show the thrust of the Susitna Glacier fault. The preferred coseismic slip model for the M_w7.9 earthquake shows that the slip is relatively small in the western part of the rupture and relatively large at a point about 60 km east of the epicenter to the point of intersection of the Denali fault and the Turttemberger fault. We found that most of the shallow slides from the surface to the depth of 15km, but the inversion shows that there is a large deep slip layer 110km east of the epicenter. Our model predicts that surface slip is very consistent with surface geological observations and the model resolution is also very good.