2022年1月8日青海门源发生MS 6.9地震,基于青海地震台网对此次地震序列时空演化特征进行分析。结果表明,门源地震序列的空间展布整体上呈西段NWW、东段SE向的带状分布,且序列衰减较缓慢。另外,基于同一构造历史地震类比、h值、等待时间法等进行分析,认为门源MS 6.9地震序列为主—余型;根据祁连地震带中东段5级以上地震最大余震发震时间统计和震级差特征分析认为,门源MS 6.9地震的最大余震已经发生,即2022年1月12日18时20分的MS 5.2地震。
On January 8, 2022, an earthquake with magnitude of 6.9 struck Menyuan city of Qinghai, and we analyze the temporal and spatial evolution characteristics of sequence using data recorded by Qinghai Earthquake Network. Results show that the distribution of Menyuan earthquake sequence is NWW of the west segment, southeast of the east segment to the zonal distribution, and the sequence decays slowly. Through comparing with historical earthquake sequences in the same tectonic, analyzing by the method of h-value and the method of dt-t, we determine that the Menyuan MS 6.9 earthquake sequence belongs to mainshock-aftershock type. According to the statistics of the original time of the strongest aftershock of historical earthquakes in Qilian seismic belt and the distribution characteristics of the magnitude differences, we conclude that the strongest aftershock of the Menyuan MS 6.9 earthquake has occurred, which is the MS 5.2 earthquake at 18:20 on January 12, 2022.
2022,43(4): 15-22 收稿日期:2022-03-01
DOI:10.3969/j.issn.1003-3246.2022.04.003
基金项目:青海省科技成果转化专项(项目编号;2021-SF-151)
作者简介:余娜(1984—),女,工程师,主要从事数字地震资料的应用与研究。E-mail:yuna2003@126.com
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