Probing Coulomb stress triggering effects for a Mw>6.0 earthquake sequence from 1997 to 2014 along the periphery of the Bayan Har block on the Tibetan Plateau

Probing Coulomb stress triggering effects for a Mw>6.0 earthquake sequence from 1997 to 2014 along the periphery of the Bayan Har block on the Tibetan Plateau
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1997-2014年青藏高原巴颜喀拉地块周缘Mw>6.0地震序列库仑应力触发效应探讨

DOI:
10.1016/j.tecto.2016.11.009
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发表时间:
2017-01
期刊:
影响因子:
2.9
通讯作者:
Li Zhenhong
Li Zhenhong
中科院分区:
地球科学2区
文献类型:
--
作者:
Wang Jianjun;Xu Caijun;Freymueller Jeffrey T.;Li Zhenhong

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青藏高原北方巴彦哈尔地块周边沿着发生了1997年满依、2001年可可西里、2008年于田、2008年汶川、2010年玉树、2013年芦山、2014年于田、2014年康定地震的满依-康定地震序列。我们采用库仑破裂模型来探讨同震、震后和震间库仑应力变化对该序列的应力触发作用。研究了1411 - 2012年满义-康定序列和巴彦哈尔块体周边其他大地震的库仑应力变化及震间构造应力。我们使用一个分层的球形震后松弛模型来计算震后库仑应力变化。本文发展了一个计算地震间库仑应力变化的显式球面最小二乘配点模型。结果表明,仅考虑满邑-康定序列地震的触发效应时,除2013年芦山地震(0.14 bar)外,同震和震后库仑应力变化的复合库仑应力变化一般不显著。尽管震间库仑应力变化总是加载于各震源,但满邑-康定序列所赋予的库仑应力变化的普遍不显著性与前人的研究一致。另一方面,当考虑周围先前M ≥ 6.0地震时,我们发现复合库仑应力变化变得显著,根据中间系数为0.4的恒定视摩擦库仑破坏模型,复合库仑应力变化范围为0.14至10.4巴。因此,在充分考虑巴彦哈尔块体周围大地震的情况下,库仑应力变化对这8次地震都有很好的解释。我们的研究结果表明,库仑应力分析考虑更广泛的一组相邻的大地震的重要性。
Recently there have occurred the Manyi-Kangding earthquake sequence, including the 1997 Manyi, 2001 Kokoxili, 2008 Yutian, 2008 Wenchuan, 2010 Yushu, 2013 Lushan, 2014 Yutian and 2014 Kangding earthquakes, along the periphery of the Bayan Har block on the northern Tibetan Plateau. We employ the Coulomb failure model to probe the stress triggering effects on this sequence in terms of coseismic, postseismic and interseismic Coulomb stress changes. We examine the Coulomb stress changes from both the Manyi-Kangding sequence and other large earthquakes from 1411 to 2012 around the Bayan Har block and interseismic tectonic stressing. We use a stratified spherical postseismic relaxation model to compute postseismic Coulomb stress changes. We develop an explicit spherical least-squares collocation model to calculate interseismic Coulomb stress changes. Our results indicate that when merely considering triggering effects because of earthquakes from the Manyi-Kangding sequence, the compounded Coulomb stress changes of the coseismic and postseismic Coulomb stress changes are generally insignificant, except for the 2013 Lushan earthquake (0.14 bar). This general insignificance of Coulomb stress changes imparted by the Manyi-Kangding sequence agrees with previous studies, although interseismic Coulomb stress changes always load each hypocenter. On the other hand, when surrounding prior M ≥ 6.0 earthquakes are considered, we found that the compounded Coulomb stress changes become significant, ranging from 0.14 to 10.4 bars according to the constant apparent friction Coulomb failure model with an intermediate coefficient of 0.4. Therefore, all eight earthquakes are well explained by Coulomb stress changes when thoroughly considering large earthquakes around the Bayan Har block. Our findings indicate the importance of considering a broader group of neighboring large earthquakes for Coulomb stress analysis.
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发表时间: 2010-08
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