Tectonics of the Central Zagros (Iran) deduced from microearthquake seismicity
Tectonics of the Central Zagros (Iran) deduced from microearthquake seismicity
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根据微地震活动推论的扎格罗斯中部（伊朗）的构造
DOI：
10.1111/j.1365-246x.2003.02145.x
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发表时间：
2004
影响因子：
2.8
通讯作者：
M. Ghafory
中科院分区：
文献类型：
--
作者：
M. Tatar;D. Hatzfeld;M. Ghafory
1997年在扎格罗斯中部记录了7个星期的微震，位于一个16 -8公里的区域，可能位于11公里的沉积物之下。它们并不位于沉积物和结晶地壳之间的活动滑脱上，而是定义了一种NNW-SSE走向线性构造模式，平行于在地表观察到的褶皱轴。地震线性体之间的间距为15-20 km，因此不同于褶皱之间的间距（10-15 km），这表明两者之间不存在简单的关系。震源机制和精确的相对位置与NW-SE向逆断层连接NNW-SSE向右行走滑断层相一致。逆断层的倾角不确定，但最北的断层可能是东北向。从P-轴推导出的应变模式是非常相似的缩短推导出基于GPS的大地测量表明，微震是响应的prefractionated脆性地壳应变，而不是本地化的单个活动断层。
SUMMARY Microearthquakes in Central Zagros, recorded for 7 weeks in 1997, lie in a ∼6-8 km zone that is likely located beneath 11 km of sediments. They are not located on an active decollement between the sediments and the crystalline crust, but rather define a pattern of NNW-SSE trending lineaments parallel to the fold axes observed at the surface. The spacing between the seismic lineaments is ∼15-20 km and therefore different from that between the folds (∼10-15 km), which suggests that there is not a simple relationship between the two. Focal mechanisms and precise relative locations are consistent with NW-SE striking reverse faulting connected by NNW-SSE striking right lateral strike-slip faults. The dip of the reverse faults is not certain but is likely NE for the northernmost faults. The strain pattern deduced from the P-axes is remarkably similar to the shortening deduced from GPS-based geodesy suggesting that microearthquakes are the response of the prefractured brittle crust to strain rather than localized on single active faults.