首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A 6000-year-long paleoseismologic record of earthquakes along the Xorkoli section of the Altyn Tagh fault, China
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A 6000-year-long paleoseismologic record of earthquakes along the Xorkoli section of the Altyn Tagh fault, China

机译:沿着Altyn Tagh Fault的Xorkoli段地震的6000年长期古摆力记录,中国

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摘要

Long records of paleoearthquakes are essential for understanding earthquake recurrence behavior of active faults and for evaluating regional seismic hazard. However, paleoseismic data on the Altyn Tagh fault (ATF), one of the longest strike-slip fault in Asia, are scarce. We document a long paleoseismic record along the Xorkoli section of the central ATF. Eight and probably nine earthquakes are identified based on event evidence in the form of open fissures, folds, unconformities, and upward fault terminations, with modeled mean (95% confidence) ages of A.D. 1598 (1491-1741) yr (event A), A.D. 797 (676-926) yr (B), B.C. 668 (732-589) yr (C), B.C. 956 (1206-715) yr (D), B.C. 1301 (1369-1235) yr (E), B.C. 2105 (2233-1987) yr (F, probable), B.C. 2663 (2731-2601) yr (G), B.C. 2818 (2878-2742) yr (H), B.C. 3396 (3522-3205) yr (I). The mean recurrence interval is 620 +/- 410 yr with a coefficient of variation (COV) of 0.67, indicating that earthquake recurrence is weakly periodic, with individual intervals ranging from as short as 150 yr to as long as 1460 yr. A global compilation of 35 strike-slip paleoseismic sites yields a similar average COV of 0.69. Synthesis of paleoseismic sites from the central ATF indicates that not all earthquakes ruptured to the eastern end of the Xorkoli section, within the Aksay restraining bend. Given that the 420-yr elapsed time since the most recent event, well within a COV of mean interval, a large surface-rupturing earthquake could occur at any time along the central ATF. (C) 2018 Elsevier B.V. All rights reserved.
机译:古老地震的长记录对于了解积极故障的地震复发行为和评估区域地震危害至关重要。然而,Altyn Tagh故障(ATF)的古摆动数据是亚洲最长的滑动故障之一是稀缺的。我们记录沿着中央ATF的Xorkoli部分的长古摆力记录。基于开放裂缝,折叠,不整合和向上故障终端形式的事件证据来确定八个和可能九个地震,具有建模平均(95%信心)AD 1598(1491-1741)YR(事件a), AD 797(676-926)YR(B),BC 668(732-589)YR(C),B.C. 956(1206-715)Yr(D),B.C. 1301(1369-1235)YR(E),B.C. 2105(2233-1987)Yr(F,可能),B.C. 2663(2731-2601)Yr(G),B.C. 2818(2878-2742)Yr(H),B.C. 3396(3522-3205)Yr(i)。平均复发间隔是620 +/- 410yr,其变异系数为0.67,表明地震复发是弱周期性的,各个间隔从短至150秒到长达1460年。全球汇编35次滑行古源性地点产生类似于0.69的平均COV。从中央ATF的合成古摆力表明,并非所有地震都破裂到Xorkoli部分的东端,在Aksay抑制弯曲中。鉴于自最近事件的420 yr经过的时间,在平均间隔的COV内,可能在沿着中央ATF的任何时间发生大的表面破裂地震。 (c)2018年elestvier b.v.保留所有权利。

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