气候变化领域集成服务门户(CCPortal): Relocation of the 8 January 2022 Menyuan (Ms 6.9), China, earthquake sequence: A conjugated type of rupturing event with a seismic gap in the Qilian-Haiyuan fault in northeast Tibet

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DOI	10.1016/j.jseaes.2023.105800
	Relocation of the 8 January 2022 Menyuan (Ms 6.9), China, earthquake sequence: A conjugated type of rupturing event with a seismic gap in the Qilian-Haiyuan fault in northeast Tibet
	Zou, Kang; Lei, Jianshe
发表日期	2023
ISSN	1367-9120
EISSN	1878-5786
卷号	258
英文摘要	On 8 January 2022, an earthquake with Ms 6.9 struck Menyuan County, Qinghai Province, China, which pro-vides an opportunity to investigate the seismotectonics of the Qilian-Haiyuan fault in northeast Tibet. We collect seismic observation data from China Seismic Network Center from 8 January to 6 February 2022 around the 2022 Menyuan mainshock. The double-difference relocation algorithm is applied to relocate 904 earthquakes, and 820 high-precision hypocenter locations are obtained. The mainshock epicenter was located at 10.2 km depth in the Tuolaishan fault. The aftershock sequence extended towards nearly E-W along the Tuolaishan fault and NW-SE along the Lenglongling fault, parts of the Qilian-Haiyuan fault, but there were fewer aftershocks at the beginning of the rupture near the intersection between the Lenglongling and Tuolaishan faults, suggesting a conjugated type of rupturing with a seismic gap. Integrating with focal mechanism solutions of mainshock and one large aftershock, we suggest that the rupture is a left-lateral strike-slip event with a high dip. The stress change around the faults intersection. The 1986 Ms 6.4 earthquake may trigger the 2016 Ms 6.4 earthquake, and then the extrusion stress could transfer to around the 2022 Ms 6.9 earthquake source area due to the Indo-Eurasian collision. Previous tomographic models revealed low-velocity anomalies under the Menyuan earth-quakes, reflecting that fluids could decrease friction coefficient and normal stress on the fault planes and further promote the generation of these earthquakes. These fluids could be contained in the lower crustal flow and mantle upwelling flow under northeast Tibet.
关键词	Menyuan earthquake Relocation Double-difference algorithm Tuolaishan and Lenglongling faults Northeast Tibet
英文关键词	FOCAL MECHANISM SOLUTIONS; STRIKE-SLIP; ACTIVE FAULTS; LOCATION ALGORITHM; PLATE MOTION; STRESS-FIELD; QINGHAI; DEFORMATION; MARGIN; YUNNAN
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001121120800001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282898
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zou, Kang,Lei, Jianshe. Relocation of the 8 January 2022 Menyuan (Ms 6.9), China, earthquake sequence: A conjugated type of rupturing event with a seismic gap in the Qilian-Haiyuan fault in northeast Tibet[J],2023,258.
APA	Zou, Kang,&Lei, Jianshe.(2023).Relocation of the 8 January 2022 Menyuan (Ms 6.9), China, earthquake sequence: A conjugated type of rupturing event with a seismic gap in the Qilian-Haiyuan fault in northeast Tibet.JOURNAL OF ASIAN EARTH SCIENCES,258.
MLA	Zou, Kang,et al."Relocation of the 8 January 2022 Menyuan (Ms 6.9), China, earthquake sequence: A conjugated type of rupturing event with a seismic gap in the Qilian-Haiyuan fault in northeast Tibet".JOURNAL OF ASIAN EARTH SCIENCES 258(2023).