气候变化领域集成服务门户(CCPortal): Millennial recurrence of large earthquakes on the Haiyuan fault near Songshan, Gansu Province, China

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DOI	10.1785/0120050118
	Millennial recurrence of large earthquakes on the Haiyuan fault near Songshan, Gansu Province, China
	Liu-Zeng, Jing; Klinger, Yann; Xu, Xiwei; Lasserre, Cecile; Chen, Guihua; Chen, Wenbing; Tapponnier, Paul; Zhang, Biao
发表日期	2007
ISSN	0037-1106
EISSN	1943-3573
起始页码	14
结束页码	34
卷号	97 期号:1
英文摘要	The Haiyuan fault is a major active left-lateral fault along the northeast edge of the Tibet-Qinghai Plateau. Studying this fault is important in understanding current deformation of the plateau and the mechanics of continental deformation in general. Previous studies have mostly focused on the slip rate of the fault. Paleoseismic investigations on the fault are sparse, and have been targeted mostly at the stretch of the fault that ruptured in the 1920 M similar to 8.6 earthquake in Ningxia Province. To investigate the millennial seismic history of the western Haiyuan fault, we opened two trenches in a small pull-apart basin near Songshan, in Gansu Province. The excavation exposes sedimentary layers of alternating colors: dark brown silty to clayey deposit and light yellowish brown layers of coarser-grained sandy deposit. The main fault zone is readily recognizable by the disruption and tilting of the layers. Six paleoseismic events are identified and named SS1 through SS6, from youngest to oldest. Charcoal is abundant, yet generally tiny in the shallowest parts of the trench exposures. Thirteen samples were dated to constrain the ages of paleoseismic events. All six events have occurred during the past 3500-3900 years. The horizontal offsets associated with these events are poorly known. However, events SS3 to SS6 appear to be large ones, judging from comparison of vertical separations and widths of fault zones. The youngest event SSI instead seems to be a minor one, probably the 1990 M-w 5.8 earthquake. Thus, four large events in 3500-3900 years would imply a recurrence interval of about 1000 years. Three events SS2 to SS4 prior to 1990 occurred sometime during 1440-1640 A.D., shortly after 890-1000 A.D. and 0-410 A.D., respectively. We tentatively associate them with the 1514 A.D., 1092 A.D., and 143 or 374 A.D. historical earthquakes. Taking 10 +/- 2 m of slip for large events (SS3 and SS4), comparable to the 1920 M > 8 Haiyuan earthquake, their occurrence times would be consistent with the long-term 12 +/- 4 mm/yr estimate of Lasserre et al. (1999). However, a more realistic evaluation of slip rate and its possible change with time requires a more rigorous determination of coseismic slip amounts of past earthquakes.
关键词	SAN-ANDREAS-FAULT CALIFORNIA SHEAR ZONE GLOBAL POSITIONING SYSTEM TRANSIENT STRAIN ACCUMULATION NORTH ANATOLIAN FAULT INDIA-ASIA COLLISION LOW SLIP RATE TIBETAN PLATEAU CARRIZO PLAIN CRUSTAL DEFORMATION
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000244197900002
来源期刊	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257521
推荐引用方式 GB/T 7714	Liu-Zeng, Jing,Klinger, Yann,Xu, Xiwei,et al. Millennial recurrence of large earthquakes on the Haiyuan fault near Songshan, Gansu Province, China[J]. 中国科学院青藏高原研究所,2007,97(1).
APA	Liu-Zeng, Jing.,Klinger, Yann.,Xu, Xiwei.,Lasserre, Cecile.,Chen, Guihua.,...&Zhang, Biao.(2007).Millennial recurrence of large earthquakes on the Haiyuan fault near Songshan, Gansu Province, China.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,97(1).
MLA	Liu-Zeng, Jing,et al."Millennial recurrence of large earthquakes on the Haiyuan fault near Songshan, Gansu Province, China".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 97.1(2007).