The 2002 June 22 Changureh (Avaj) earthquake in Qazvin province, northwest Iran: epicentral relocation, source parameters, surface deformation and geomorphology
The 2002 June 22 Changureh (Avaj) earthquake in Qazvin province, northwest Iran: epicentral relocation, source parameters, surface deformation and geomorphology
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2002年6月22日伊朗西北部加兹温省昌古雷（Avaj）地震：震中迁移、震源参数、地表变形和地貌
DOI：
10.1111/j.1365-246x.2005.02516.x
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发表时间：
2005
影响因子：
2.8
通讯作者：
M. Talebian
中科院分区：
文献类型：
--
作者：
R. Walker;E. Bergman;J. Jackson;Manoucher Ghorashi;M. Talebian
摘要2002年6月22日伊朗西北部加兹温省昌古雷（Avaj）发生6.4级地震。我们使用的观测地震，实地调查和卫星图像和数字地形的分析表明，以前未被识别的逆冲断层（本文命名为Abdarreh断层）的滑动负责地震。长周期P波和SH体波地震图的反演显示，在一个向西南倾斜49 °、质心深度为1000 km的逆冲断层上发生了破裂。多事件迁移的主震和余震震中和地震后观察到的不连续的表面破裂是兼容的西北传播破裂西南倾斜的推力，但最大记录位移远小于预期的地震学，这表明大部分的滑动未能达到表面，而是容纳在表面折叠。长期的褶皱是很难看到在震中地区的地形作为Abdarreh褶皱是通过残留的新近纪地形增长。然而，从排水中断和河流切割可以推断出背斜隆起。2002年6月22日Changureh地震表明能够解释景观中活动断层的诊断特征的重要性。
SUMMARY The M w 6.4 Changureh (Avaj) earthquake occurred on 2002 June 22, in Qazvin province, northwest Iran. We use observations from seismology, field investigation and analysis of satellite imagery and digital topography to suggest that slip on a previously unrecognized thrust fault (herein named the Abdarreh fault) was responsible for the earthquake. Inversion of longperiod P and SH body wave seismograms shows rupture on a thrust fault dipping 49 ◦ to the southwest and with a centroid depth of ∼10 km. Multiple-event relocation of the main shock and aftershock epicentres and discontinuous surface ruptures observed after the earthquake are compatible with a northwest-propagating rupture on a southwest-dipping thrust, but maximum recorded displacements are much less than expected from seismology, suggesting that much of the slip failed to reach the surface and was accommodated as folding at the surface instead. Long-term folding is difficult to see in the topography of the epicentral region as the Abdarreh fold is growing through a relict Neogene topography. Anticlinal uplift can, however, be inferred from drainage disruption and stream incision. The 2002 June 22 Changureh earthquake shows the importance of being able to interpret diagnostic features of active faulting in the landscape.