Evidence of NW extension of the North Anatolian Fault Zone in the Marmara Sea: a new interpretation of the Marmara Sea (İzmit) earthquake on 17 August 1999
Evidence of NW extension of the North Anatolian Fault Zone in the Marmara Sea: a new interpretation of the Marmara Sea (İzmit) earthquake on 17 August 1999
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DOI：
10.1007/s00367-001-0088-0
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发表时间：
2001-12
影响因子：
2.1
通讯作者：
E. Gökaşan;Cem Gazi̇oğlu;B. Alpar;Z. Yücel;S. Ersoy;Oğuz Gündoğdu;C. Yaltırak;B. Tok
中科院分区：
文献类型：
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作者：
E. Gökaşan;Cem Gazi̇oğlu;B. Alpar;Z. Yücel;S. Ersoy;Oğuz Gündoğdu;C. Yaltırak;B. Tok
在马尔马拉海北部Avcılar陆架浅层地震资料中观测到活动断裂向北西-东南方向排列，形成走滑断层花状构造。根据平行的水系格局和陡坡，这些断裂在马尔马拉海北部岸段（色雷斯半岛东部）的形态上被描绘为北西-西向的轮廓线。两个排水流域以及马尔马拉海和黑海沿岸的右侧位移与这些地形有关。这种沿断层走向的右移表明，在马尔马拉海Çınarcık盆地北界断层的北西伸展处存在一条新的、活跃的走滑断裂带。这个新的断裂带被解释为北安纳托利亚断裂带（NAFZ）北分支的北西延伸，从马尔马拉海的Çınarcık盆地延伸到色雷斯半岛的黑海海岸，穿过B <s:1> y <e:1> K <s:1> <s:1> K <s:1> ekmece和K ü ç K <s:1> ekmece泻湖。这些数据表明1999年8月17日NAFZ地震的破裂可能延伸至Avcılar。事实上，位于马尔马拉海沿岸断裂路线的Avcılar和İzmit都受到了强烈的地震袭击，而Avcılar和İzmit之间的定居点受到的影响要小得多。因此，基于马尔马拉海新发现的NAFZ破裂，这种解释可以解释Avcılar的异常损害。然而，这一建议需要进一步的地震学研究来证实。
Active faults aligning in NW–SE direction and forming flower structures of strike-slip faults were observed in shallow seismic data from the shelf offshore of Avcılar in the northern Marmara Sea. By following the parallel drainage pattern and scarps, these faults were traced as NW–SE-directed lineaments in the morphology of the northern onshore sector of the Marmara Sea (eastern Thrace Peninsula). Right-lateral displacements in two watersheds of drainage and on the coast of the Marmara Sea and Black Sea are associated with these lineaments. This right-lateral displacement along the course of these faults suggests a new, active strike-slip fault zone located at the NW extension of the northern boundary fault of the Çınarcık Basin in the Marmara Sea. This new fault zone is interpreted as the NW extension of the northern branch of the North Anatolian Fault Zone (NAFZ), extending from the Çınarcık Basin of the Marmara Sea to the Black Sea coast of the Thrace Peninsula, and passing through B üy ük çekmece and K ü ç ük çekmece lagoons. These data suggest that the rupture of the 17 August 1999 earthquake in the NAFZ may have extended through Avcılar. Indeed, Avcılar and İzmit, both located on the Marmara Sea coast along the rupture route, were strongly struck by the earthquake whereas the settlements between Avcılar and İzmit were much less affected. Therefore, this interpretation can explain the extraordinary damage in Avcılar, based on the newly discovered rupture of the NAFZ in the Marmara Sea. However, this suggestion needs to be confirmed by further seismological studies.