| 青海门源6.9级地震同震及震前GNSS变形特征分析 |
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| 引用本文： | 朱爽,占伟,梁洪宝,李经纬.青海门源6.9级地震同震及震前GNSS变形特征分析[J].西北地震学报,2022,44(2):370-379. |
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| 作者姓名： | 朱爽 占伟 梁洪宝 李经纬 |
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| 作者单位： | 中国地震局第一监测中心 |
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| 基金项目： | 国家自然科学基金-巴颜喀拉地块东北边界三维变形与强震过程研究(41974011)； |
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| 摘 要： | 北京时间2022年1月8日1点45分,在我国青海省门源县发生了6.9级地震.通过震中附近陆态网络GNSS连续观测数据得到的同震位移场显示,距离震中最近的QHME站同震位移最大,EW向达到20.31 mm,SW向达到-35.45 mm,震中附近五个站的同震位移反映出此次地震的左旋同震破裂特征;GNSS站间基线时间序列结果...
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| 关 键 词： | 门源地震 GNSS 同震 应变场 滑动速率 |
| 收稿时间： | 2022/2/15 0:00:00 |
Coseismic deformation characteristics before the Menyuan, Qinghai M6.9 earthquake from GNSS observation data |
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| ZHU Shuang,ZHAN Wei,LIANG Hongbao,LI Jingwei.Coseismic deformation characteristics before the Menyuan, Qinghai M6.9 earthquake from GNSS observation data[J].Northwestern Seismological Journal,2022,44(2):370-379. |
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| Authors: | ZHU Shuang ZHAN Wei LIANG Hongbao LI Jingwei |
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| Institution: | The First Monitoring and Application Center, CEA, Tianjin 300180, China |
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| Abstract: | At 1: 45 on January 8, 2022, an earthquake of magnitude 6.9 occurred in Menyuan County, Qinghai Province. The coseismic displacement field obtained from GNSS continuous observation data near the epicenter showed that the coseismic displacement of QHME station, which is closest to the epicenter, was the largest, reaching 20.31 mm in the east-west direction and -35.45 mm in the north-south direction. The coseismic displacements of five stations near the epicenter reflected the characteristics of left-lateral coseismic rupture of the earthquake. The results of regional strain time series and baseline time series between GNSS stations showed that the crustal movement in the north section of Lenglongling fault is stronger than that in the south section, which corresponds to the area where the earthquake occurred. The results of dynamic GNSS strain field before the earthquake showed that the shear strain value in the study area was small, with a slight decreasing trend, but it was always at the edge of the high strain zone. The slip velocity of the seismogenic fault changed little, and the value first increased and then weakened. The degree of fault blocking increased before the earthquake, which may lead to the occurrence of the earthquake. |
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| Keywords: | Menyuan earthquake GNSS co-seismic strain field slip rate |
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