| 玛多7.4级地震和门源6.9级地震前佐署地下流体异常特征分析 |
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| 引用本文： | 苏维刚,刘磊,孙玺皓.玛多7.4级地震和门源6.9级地震前佐署地下流体异常特征分析[J].西北地震学报,2022,44(3):700-706,712. |
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| 作者姓名： | 苏维刚 刘磊 孙玺皓 |
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| 作者单位： | 青海省地震局 |
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| 基金项目： | 2022年度震情跟踪定向工作任务(2022010218) |
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| 摘 要： | 2021年5月22日青海玛多发生了MS7.4地震，该次地震打破了中国大陆长时间的7级地震平静，随后在2022年1月8日发生青海门源MS6.9地震，分析这两次地震前的前兆异常变化对于青藏高原强震孕震过程和强震短临跟踪具有重要意义。通过对两次地震前青海西宁佐署地震台地下流体异常变化特征、同震响应和震后效应特征分析，发现：佐署动水位异常在2021年2月25日和2021年8月25日出现突降异常变化，较好地对应了玛多MS7.4和门源MS6.9地震；佐署动水位、水温在2021年7月10日同步出现的趋势性转折异常对门源MS6.9地震有一定的时空指示意义。佐署台作为构造敏感点，其地下流体异常变化对青海及邻区次级块体上强震具有较好的短期指示意义。
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| 关 键 词： | 玛多MS7.4地震 门源MS6.9地震 水位 水温 异常特征 佐署地震台 |
Characteristics of underground fluid anomalies in Zuoshu station before Maduo MS7.4 and Menyuan MS6.9 earthquakes |
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| SU Weigang,LIU Lei,SUN Xihao.Characteristics of underground fluid anomalies in Zuoshu station before Maduo MS7.4 and Menyuan MS6.9 earthquakes[J].Northwestern Seismological Journal,2022,44(3):700-706,712. |
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| Authors: | SU Weigang LIU Lei SUN Xihao |
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| Institution: | Qinghai Earthquake Agency,Xining 810001 ,Qinghai,China |
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| Abstract: | The Maduo, Qinghai MS7.4 earthquake on May 22, 2021 broke the long-term M7 earthquake quiescence in Chinese Mainland, followed by the Menyuan, Qinghai MS6.9 earthquake on January 8, 2022. Understanding the precursory anomaly evolution before the two earthquakes is of great significance for the seismogenic process and short impending tracking of strong earthquakes in the Tibetan Plateau. In this paper, the anomaly characteristics, coseismic response, and post-earthquake effect of underground fluid at Zuoshu station in Xining City, Qinghai Province before the two earthquakes were analyzed, and the results show that the sudden drop of dynamic water level in Zoshu on February 25 and August 25, 2021 corresponds to the Maduo MS7.4 and Menyuan MS6.9 earthquakes, respectively. Furthermore, the trend turning anomaly of the dynamic water level and water temperature, which simultaneously appeared at Zuoshu station on July 10, 2021, has a certain spatio-temporal significance for the subsequent Menyuan MS6.9 earthquake. Through a discussion on the mechanism of water level and water temperature precursory anomalies at Zuoshu seismic station, it is found that the abnormal changes of underground fluid have a good short-term indication for strong earthquakes in the secondary block of Qinghai Province and its surrounding areas. |
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