The 2010-2011 Canterbury, New Zealand, seismic sequence: Multiple source analysis from InSAR data and modeling
The 2010-2011 Canterbury, New Zealand, seismic sequence: Multiple source analysis from InSAR data and modeling
复制标题
DOI：
10.1029/2012jb009178
复制
发表时间：
2012-08
影响因子：
--
通讯作者：
S. Atzori;C. Tolomei;A. Antonioli;J. M. Boncori;Stephen Bannister;E. Trasatti;P. Pasquali;S. Salvi
中科院分区：
文献类型：
--
作者：
S. Atzori;C. Tolomei;A. Antonioli;J. M. Boncori;Stephen Bannister;E. Trasatti;P. Pasquali;S. Salvi
[1]2010-2011年坎特伯雷地震序列是一个复杂的地震事件系统，从7.1 Mw7.1级地震开始，持续发生大的余震，造成戏剧性的后果，特别是对克赖斯特彻奇市来说。我们使用InSAR数据对主震进行建模，提供了2010年9月4日、2011年2月22日和2011年6月13日地震的位移图和相应的建模。用重新定位的余震、野外观测和GPS测量来约束InSAR数据反演得到的模型；用一种旨在最大化断层面上空间分辨率的可变面片大小的方法来反演断层滑动分布。对于2010年9月的地震，我们估计了深度在10公里以下的显著滑移值；2011年2月在克赖斯特彻奇发生的灾难性地震被模拟为双断层源，滑移值小于2米，深达7公里；对于6月13日在克赖斯特彻奇发生的第二次地震，我们确定了一条北西-南东走向的断层是导致地震的原因。最后，我们介绍了使用InSAR相干图来快速检测克赖斯特彻奇土壤液化的区域，如两个主要事件所示。
[1] The 2010–2011 Canterbury sequence is a complex system of seismic events that started with a Mw7.1 earthquake and continued with large aftershocks with dramatic consequences, particularly for the city of Christchurch. We model the main earthquakes using InSAR data, providing displacement maps and the respective modeling for the September 4th, 2010, February 22nd, 2011 and June 13th, 2011 events. Relocated aftershocks, field and GPS surveys are used to constrain models obtained by inversion of InSAR data; the fault slip distribution is retrieved with a variable patch size approach aimed at maximizing the spatial resolution on the fault plane. For the September 2010 earthquake we estimated significant slip values below 10 km depth; the calamitous February 2011 event in Christchurch is modeled with a double fault source with slip values less than 2 m down to 7 km depth; for the second June 13th event in Christchurch we identified a NW-SE striking fault as responsible for the earthquake. Last, we introduce the use of InSAR coherence maps to quickly detect the areas subject to soil liquefaction in Christchurch, as shown for the two main events.