Rupture Process of the 23 October 2011 Mw7.1 Van Earthquake in Eastern Turkey by Joint Inversion of Teleseismic, GPS and Strong-Motion Data
Rupture Process of the 23 October 2011 Mw7.1 Van Earthquake in Eastern Turkey by Joint Inversion of Teleseismic, GPS and Strong-Motion Data
复制标题
远震、GPS和强震数据联合反演2011年10月23日土耳其东部Mw7.1 Van地震破裂过程
DOI：
10.1007/s00024-014-0994-5
复制
发表时间：
2015-06
影响因子：
2
通讯作者：
Wang, Rongjiang
中科院分区：
文献类型：
--
作者：
Liu, Chengli;Zheng, Yong;Xiong, Xiong;Wang, Rongjiang
2011年10月23日，世界协调时10时41分22分，土耳其东部范(Van)地区及周边地区发生强烈地震(Mw=97.1)(以下简称范地震)，震源区受损严重。对该次地震的震源机制、地震矩、震源深度和破裂模式进行了研究。然而，这些模型在时刻释放、震源深度和滑动凹凸度方面仍存在显著差异。由于这些模型大多只使用单一数据集来研究震源参数，因此这些结果的可靠性仍是一个令人担忧的问题。为了弄清主震的不确定性，并为主震提供可靠的详细破裂模式，我们利用远震宽带地震图、近场静态GPS位移记录和强震资料的联合反演，研究了凡地震的破裂过程。反演结果表明，主震以逆冲滑动为主，震中以下有一小部分左旋走滑分量。破裂开始于震源深度16公里处，并向地表传播，平均破裂速度为~1.8公里/S，表明地震的主要能量是在长周期带内释放的，这是长周期或静信号反演的地震矩高于短周期资料的主要原因。大部分滑移发生在震中附近，最大滑移量超过3.3微米，相应的静应力降约为3微帕。整个断层的总地震矩为5.76亿×1019N·m，大部分能量释放在S的前20个地震阶段，处于已公布的破裂模型的变化范围内。大滑移集中在更深的深度，并延伸到约25公里的深度。同时，地表破裂相当小，这解释了为什么在如此强烈的地震造成的地表只观察到微弱的破裂。
On 23 October 2011, a strong earthquake (Mw = 7.1) struck the Van (Eastern Turkey) region and its surrounding areas at 10:41:22 UTC (hereafter referred to as the Van earthquake), causing severe damage to the source region. Several studies have been carried out on the focal mechanism, seismic moment, focal depth and rupture model of this earthquake. However, there are still significant differences in the moment release, focal depth and slip asperities among these models. Since most of these models only used a single data set to investigate the source parameters, the reliability of these results is still a concern. In order to make clear the uncertainties and provide a reliable detailed rupture model for the mainshock, we investigated the rupture process of the Van earthquake by a joint inversion of teleseismic broadband seismograms, near-field static GPS displacement records and strong-motion data. The inversion results indicate that the mainshock was dominated by a thrust slip with a small part of a left-lateral strike-slip component below the hypocenter. The rupture initiated at a focal depth of 16 km and propagated to the surface with a relatively low average rupture velocity of ~1.8 km/s, suggesting that the major energy of the earthquake was released in a long-period band, which is the main reason why the seismic moments inverted by a long period or static signals are higher than those obtained by short-period data. Most of the slip occurred around the hypocenter with a maximum slip of more than 3.3 m, and the associated static stress drop was ~3 MPa. The total seismic moment of the whole fault was 5.76 × 1019 N·m, and most energy was released in the first 20 s, which is in the variation range of the released rupture models. The major slip was concentrated at deeper depth and extended to a depth of around 25 km. Meanwhile, the surface rupture was quite small, which explains why only weak ruptures were observed at the surface although caused by such a strong earthquake.
登录
查看更多内容
影响因子：
4.5
作者：
N. Ambraseys
通讯作者：
N. Ambraseys
影响因子：
3
作者：
D. Wald;T. Heaton;K. Hudnut
通讯作者：
D. Wald;T. Heaton;K. Hudnut
影响因子：
3.9
作者：
Allmann, Bettina P.;Shearer, Peter M.
通讯作者：
Shearer, Peter M.
影响因子：
1
作者：
O. Tan;A. Yörük
通讯作者：
O. Tan;A. Yörük
影响因子：
2.9
作者：
Y. Altiner;W. Soehne;C. Guney;J. Perlt;Rongjiang Wang;M. Muzli
通讯作者：
Y. Altiner;W. Soehne;C. Guney;J. Perlt;Rongjiang Wang;M. Muzli