Characteristics of fluid group anomalies in Qinghai area before MS6.9 Menyuan earthquake on 8 January,2022
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表 1 2022年青海门源MS6.9地震前定点流体观测异常
Table 1 Observation of fluid anomalies at the fixed points before MS6.9 Menyuan,Qinghai earthquake in 2022
台站 异常项 异常形态 起止时间 震后变化 异常幅值 震中距/km 门源台 静水位 上升—下降 2021-09-17—11-30 异常恢复 0.089—0.16 m 37 佐署台 动水位 下降 2021-07-10—08-25 异常未恢复 0.27 m 132 佐署台 水温 上升 2021-07-10—至今 异常未恢复 0.12 m 132 平安台 静水位 破年变 2021-08-13—10-11 异常恢复 160 乐都台 气氡 上升—下降 2021-09-15—10-06 异常恢复 360—298 Bq/L 169 西宁台 气氡 下降—上升 2021-09-22—11-08 异常恢复 14.2 Bq/L 133 德令哈台 水温 上升—下降 2021-12-02—12-16 异常恢复 0.02—0.007 ℃ 344 共和台 水温 下降 2021-01-06—12-15 异常未恢复 0.1—0.4 ℃ 180 表 2 各异常台站水样的离子浓度
Table 2 The analysis results of water chemical composition
台站 Na+/(mg·L−1) K+/(mg·L−1) Mg2+/(mg·L−1) Ca2+/(mg·L−1) Cl−/(mg·L−1) SO4 2−/(mg·L−1) HCO3 −/(mg·L−1) B A B A B A B A B A B A B A 西宁台 3200.54 3386 14.52 14.49 16.37 19.03 34.27 38.00 92.64 1154 3857.94 3531 2753.64 2667 门源台 368.2 386.6 3.61 8.56 5.18 4.22 8.01 9.02 155.3 168.8 31.7 55.05 695.6 671.2 佐署台 165.3 593.9 2.29 1.456 12.54 1.571 26.64 3.976 251.7 203.5 119.1 430.2 545.2 522.5 平安台 610 1136 9.03 11.72 84.74 82.9 441.6 445.5 224.1 306.1 2207 2763 183.1 203.8 注:B为各离子背景值,A为各离子浓度异常值。 -
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