The Mw6.7 12 October 2013 western Hellenic Arc main shock and its aftershock sequence: implications for the slab properties
The Mw6.7 12 October 2013 western Hellenic Arc main shock and its aftershock sequence: implications for the slab properties
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Mw6.7 2013 年 10 月 12 日西希腊弧主震及其余震序列：对板片特性的影响
DOI：
10.1007/s00531-016-1294-3
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发表时间：
2016
影响因子：
2.3
通讯作者：
F. Vallianatos
中科院分区：
文献类型：
--
作者：
E. Papadimitriou;V. Karakostas;M. Mesimeri;F. Vallianatos
2013 年 10 月 12 日克里特岛近海发生的 Mw6.7 地震是过去几十年来希腊俯冲带 (HSZ) 西南部发生的为数不多的强地震之一，为评估下降板片的特征提供了机会。 HSZ 在历史上曾经历过几次强烈（M≥7.0）地震，其中最大的一次是公元 365 年发生的 Mw=8.4 级地震，这是已知的地中海地区发生的最大地震。 2013 年的主震发生在 365 事件附近，位于 26 公里深度的板间逆冲断层上，位于上覆板块和下降板块的耦合部分。 GCMT 解显示出在几乎水平（倾角 = 3°）的东北倾断层面上存在轻微倾斜（倾角 = 130°）的逆冲断层，其走向（340°）平行于俯冲前缘，压缩轴指向板块汇聚方向。结合余震位置和CMT解，可以更清晰地解析俯冲界面。对于这个范围，在获得avp/vsratio等于1.76、近似研究区域速度结构的一维速度模型和时间延迟以及对相位拾取数据和互相关微分时间采用双差技术后，对余震进行重新定位。第一天的重新定位地震活动与前 2 个月的余震类似，显示了下降板片上部区域的激活，大多数活动集中在 13 至 27 公里之间，主震也包含在该区域。主震附近的余震很少见，这意味着破裂面的大片区域上存在均匀滑动。根据余震分布，预计活动区域长约24公里，宽约17公里。压缩运动解析的库仑应力变化揭示了可忽略不计的断层余震触发，证明了板块下倾部分或不同断层机制的相对稳定的状态。
The 12 October 2013Mw6.7 earthquake offshore Crete Island is one of the few strong earthquakes to have occurred in the last few decades in the southwestern part of the Hellenic subduction zone (HSZ), providing the opportunity to evaluate characteristics of the descending slab. The HSZ has experienced several strong (M≥ 7.0) earthquakes in historical times with the largest one being the 365 AD,Mw= 8.4 earthquake, the largest known ever occurred in the Mediterranean region. The 2013 main shock occurred in close proximity with the 365 event, on an interplate thrust fault at a depth of 26 km, onto the coupled part of the overriding and descending plates. GCMT solution shows a slightly oblique (rake = 130°) thrust faulting with downdip compression on a nearly horizontal (dip = 3°) northeast-dipping fault plane with strike (340°) parallel to the subduction front, with the compression axis being oriented in the direction of plate convergence. The subduction interface can be more clearly resolved with the integration of aftershock locations and CMT solution. For this scope, the aftershocks were relocated after obtaining avp/vsratio equal to 1.76, a one-dimensional velocity model and time delays that approximate the velocity structure of the study area, and the employment of double-difference technique for both phase pick data and cross-correlation differential times. The first-day relocated seismicity, alike aftershocks in the first 2 months, shows activation of an area at the upper part of the descending slab, with most activity being concentrated between 13 and 27 km, where the main shock is also encompassed. Aftershocks are rare near to the main shock, implying homogeneous slip on a large patch of the rupture plane. Based on the aftershock distribution, the size of the activated area estimated is about 24 km long and 17 km wide. Coulomb stress changes resolved for transpressive motion reveal negligible off-fault aftershock triggering, evidencing a comparatively stable regime in the downdip part of the slab or different fault mechanism.
DOI：
10.5047/eps.2011.05.010
发表时间：
2011-09
期刊：
Earth, Planets and Space
影响因子：
--
作者：
S. Toda;Jian Lin;R. Stein
通讯作者：
S. Toda;Jian Lin;R. Stein
H.264编码器DCT的硬件实现及其评估
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者：
宮田康治