High-precision relocation of the aftershock sequence of the January 8, 2022, MS6.9 Menyuan earthquake

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Liping Fan , Boren Li , Shirong Liao , Ce Jiang , Lihua Fang
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引用次数: 16

Abstract

The 2022 Menyuan MS6.9 earthquake, which occurred on January 8, is the most destructive earthquake to occur near the Lenglongling (LLL) fault since the 2016 Menyuan MS6.4 earthquake. We relocated the mainshock and aftershocks with phase arrival time observations for three days after the mainshock from the Qinghai Seismic Network using the double-difference method. The total length and width of the aftershock sequence are approximately 32 km and 5 km, respectively, and the aftershocks are mainly concentrated at a depth of 7–12 km. The relocated sequence can be divided into 18 km west and 13 km east segments with a boundary approximately 5 km east of the mainshock, where aftershocks are sparse. The east and west fault structures revealed by aftershock locations differ significantly. The west fault strikes EW and inclines to the south at a 71º–90º angle, whereas the east fault strikes 133º and has a smaller dip angle. Elastic strain accumulates at conjunctions of faults with different slip rates where it is prone to large earthquakes. Based on surface traces of faults, the distribution of relocated earthquake sequence and surface ruptures, the mainshock was determined to have occurred at the conjunction of the Tuolaishan (TLS) fault and LLL fault, and the west and east segments of the aftershock sequence were on the TLS fault and LLL fault, respectively. Aftershocks migrate in the early and late stages of the earthquake sequence. In the first 1.5 h after the mainshock, aftershocks expand westward from the mainshock. In the late stage, seismicity on the northeast side of the east fault is higher than that in other regions. The migration rate of the west segment of the aftershock sequence is approximately 4.5 km/decade and the afterslip may exist in the source region.

2022年1月8日门源MS6.9级地震余震序列的高精度重新定位
1月8日发生的2022年门源MS6.9地震是自2016年门源MS6.4地震以来,在冷龙岭断层附近发生的最具破坏性的地震。利用双差法对青海地震台网主震后3天的相位到达时间观测资料进行了主震和余震的重新定位。余震序列的总长度和宽度分别约为32 km和5 km,余震主要集中在7 ~ 12 km深度。重新定位的层序可分为向西18公里和向东13公里,边界在主震以东约5公里处,余震较少。余震位置所揭示的东西断裂构造差异较大。西断裂走向东东,向南倾斜71º~ 90º,东断裂走向133º,倾角较小。弹性应变在不同滑动速率的断层连接处积累,在那里容易发生大地震。根据断层的地表迹线、重新定位地震序列的分布和地表破裂情况,确定主震发生在吐莱山断层与LLL断层的交界处,余震序列的西段和东段分别位于吐莱山断层和LLL断层上。余震在地震序列的早期和晚期发生迁移。在主震后的前1.5 h,余震从主震向西扩展。在后期,东断裂东北侧的地震活动性高于其他区域。余震序列西段的迁移速率约为4.5 km/ 10年,震源区可能存在余震。
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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
审稿时长
3 months
期刊介绍: Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.
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