Source model for the Mw 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR
Source model for the Mw 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR
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DOI：
10.1029/2003gl018014
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发表时间：
2003-09
影响因子：
5.2
通讯作者：
T. Wright;Zhong Lu;C. Wicks
中科院分区：
文献类型：
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作者：
T. Wright;Zhong Lu;C. Wicks
2002年10月23日发生的奈纳纳山地震（Mw ~ 6.7）发生在德纳里断裂带（阿拉斯加州）的西面，11天后发生的德纳里地震（Mw ~ 7.9）使同一断裂带破裂。我们利用加拿大Radarsat - 1和欧洲ERS - 2卫星的雷达图像构建了6幅干涉图，以确定同震地表变形和震源模型。卫星入射角在23 ~ 45度之间，时间间隔在72天以内。将该事件建模为弹性半空间中的位错，表明在近垂直断层上，在深度上有近0.9米的右侧走滑运动，并且地壳顶部4公里的最大滑动小于0.2米。2002年11月3日德纳里地震的未来震源库仑应力增加了30 ~ 60 kPa。
The 23 October 2002 Nenana Mountain Earthquake (Mw ∼ 6.7) occurred on the Denali Fault (Alaska), to the west of the Mw ∼ 7.9 Denali Earthquake that ruptured the same fault 11 days later. We used 6 interferograms, constructed using radar images from the Canadian Radarsat‐1 and European ERS‐2 satellites, to determine the coseismic surface deformation and a source model. Data were acquired on ascending and descending satellite passes, with incidence angles between 23 and 45 degrees, and time intervals of 72 days or less. Modeling the event as dislocations in an elastic half space suggests that there was nearly 0.9 m of right‐lateral strike‐slip motion at depth, on a near‐vertical fault, and that the maximum slip in the top 4 km of crust was less than 0.2 m. The Nenana Mountain Earthquake increased the Coulomb stress at the future hypocenter of the 3 November 2002, Denali Earthquake by 30–60 kPa.