Seismicity distribution and locking depth along the Main Marmara Fault, Turkey
Seismicity distribution and locking depth along the Main Marmara Fault, Turkey
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土耳其马尔马拉主断层沿线地震活动分布和锁定深度
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Bouchon
中科院分区：
文献类型：
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作者：
Jean Schmittbuhl;H. Karabulut;O. Lengliné;M. Bouchon
分析了2007-2012年期间马尔马拉海下方主要马尔马拉海断裂(MMF)的地震活动，以提供对这一重要区域地震空区近期演化的洞察。高精度的位置表明，地震活动沿走向和深度强烈变化，提供了大地测量观测无法获得的断层行为的精细细节。该活动强烈地聚集在盆地之间的过渡区。中央盆地显示出显著的地震活动，位于GPS测量推断的浅层锁定深度以下。其b值低，平均地震滑动大。所有的观察结果都与这一部分的深度蠕动相一致。相反，断裂中心的昆布尔加兹盆地表现出稀少的地震活动，具有闭锁段的特征。在东部马尔马拉海，Cinarcik盆地王子岛段的地震活动分布与10公里的大地测量锁定深度一致，对区域地震能量释放的贡献较小。对锁定区段区域的评估提供了即将到来的主要地震的震级估计约为7.3，假设破裂不会显着进入爬行区域内。
The seismicity along the Main Marmara Fault (MMF) below the Marmara Sea is analyzed during the 2007–2012 period to provide insights on the recent evolution of this important regional seismic gap. High precision locations show that seismicity is strongly varying along strike and depth providing fine details of the fault behavior that are inaccessible from geodetic observations. The activity strongly clusters at the regions of transition between basins. The Central basin shows significant seismicity located below the shallow locking depth inferred from GPS measurements. Its b‐value is low and the average seismic slip is high. All observations are consistent with a deep creep of this segment. On the contrary, the Kumburgaz basin at the center of the fault shows sparse seismicity with the hallmarks of a locked segment. In the eastern Marmara Sea, the seismicity distribution along the Princes Island segment in the Cinarcik basin, is consistent with the geodetic locking depth of 10 km and a low contribution to the regional seismic energy release. The assessment of the locked segment areas provide an estimate of the magnitude of the main forthcoming event to be about 7.3 assuming that the rupture will not enter significantly within creeping domains.