Regional moment tensor inversion for strong aftershocks of the August 17, 1999 Izmit Earthquake (Mw=7.4)
Regional moment tensor inversion for strong aftershocks of the August 17, 1999 Izmit Earthquake (Mw=7.4)
复制标题
1999年8月17日伊兹米特地震强余震区域矩张量反演（Mw=7.4）
DOI：
10.1029/2000gl011991
复制
发表时间：
2001
影响因子：
5.2
通讯作者：
M. Aktar
中科院分区：
文献类型：
--
作者：
Gonca Örgülü;M. Aktar
利用近区域宽频带台站资料，应用区域矩张量反演方法，分析了1999年8月17日伊兹米特地震（Mw=7.4）30次最大余震（4.0 ≤ML ≤ 6.2）的震源机制。将反演解与17个约束良好的第一运动解进行了比较，发现两者吻合良好。我们发现走滑运动的优势是伊兹米特地震序列的主要特征。在未破裂边缘的西部和东部记录到了显著的余震活动。在东部，位于Düzce镇附近的余震在位置和震源机制方面代表了1999年11月12日Düzce地震（Mw=7.2）的早期复制。在马尔马拉海，那里的断层几何形状仍然是非常差的解决方案，大多数余震的右横向走滑的解决方案，与北安纳托利亚断层的淹没分支平行的走向。
We analyzed the source mechanisms of the thirty largest aftershocks (4.0 ≤ML ≤ 6.2) of the August 17, 1999 Izmit earthquake (Mw=7.4) by applying the Regional Moment Tensor inversion method using data from near‐regional broadband stations. The inversion solutions were compared to 17 well‐constrained first motion solutions, and were seen to be in good agreement. We found that the dominance of strike‐slip motion is the main characteristic of the Izmit earthquake sequence. Significant aftershock activity was recorded to the west and east of the un‐ruptured extremities. In the east the aftershocks located near the town of Düzce represent an early replica of the November 12, 1999 Düzce earthquake (Mw=7.2) in terms of locations and source mechanisms. In the Marmara Sea, where the fault geometry is still very poorly resolved, most aftershocks have right lateral strike slip solutions with strike direction parallel to the submerged branches of the North Anatolian Fault.