Contribution to the seismotectonics of Eastern Turkey from moderate and small size events
Contribution to the seismotectonics of Eastern Turkey from moderate and small size events
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中小型事件对土耳其东部地震构造的贡献
DOI：
10.1029/2003gl018258
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发表时间：
2003
影响因子：
5.2
通讯作者：
M. Barazangi
中科院分区：
文献类型：
--
作者：
Gonca Örgülü;M. Aktar;N. Türkelli;E. Sandvol;M. Barazangi
利用土耳其东部地震实验（ETSE）产生的高质量波形数据研究了土耳其东部小到中等震级事件的震源特性。用区域矩张量反演技术对3.7级及以上的34个地震进行了反演，对115个3.0级及以上的地震进行了初动分析（其中15个地震两种方法都用了），得到了134个地震的断层面解数据集。研究的大多数事件的走滑机制与附近的局部断层结构。反向机制较为罕见，仅限于某些地区，如安纳托利亚高原东部和阿拉伯板块边界沿线沿着Karliova交界处西南部。我们的研究结果表明，在Karliova交界处的东部和西部的变形方式的差异，导致内部变形的安纳托利亚板块的东部和向西的挤压没有或很少内部变形。我们的研究结果还表明，在土耳其东部，大部分的碰撞采取了不同类型和大小的走滑断层，这表明向北收敛的阿拉伯半岛正在容纳逃逸构造。挤压特征，如逆冲断层，这显然是在大陆碰撞的最早阶段的主要断裂，仍然是活跃的，但不太重要。
Source properties of small‐to‐moderate magnitude events in eastern Turkey were studied using high quality waveform data produced by the Eastern Turkey Seismic Experiment (ETSE). A data set of fault plane solutions was obtained for 134 earthquakes using the regional moment tensor inversion technique for 34 events with magnitude 3.7 and above, and first motion analysis for 115 earthquakes with magnitude 3.0 and higher (for 15 events both techniques were used). Most of the events studied had strike slip mechanisms in agreement with nearby local fault structures. Reverse mechanisms were more scarce and were restricted to certain areas, such as in the eastern Anatolian plateau and southwest of the Karliova junction along the Arabian plate boundary. Our results indicate a difference in the deformational style east and west of the Karliova junction which results in internal deformation in the east and westward extrusion of the Anatolian plate with no or very little internal deformation in the west. Our results also suggest that in eastern Turkey, most of the collision is taken up by strike slip faults of varying types and sizes, suggesting that the northward convergence of Arabia is being accommodated by escape tectonics. Compressive features, such as thrust faulting, which were obviously the primary faulting during the earliest stages of continental collision, are still active but are of lesser importance.