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EARTHQUAKE ›› 2023, Vol. 43 ›› Issue (1): 152-170.doi: 10.12196/j.issn.1000-3274.2023.01.012

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Geochemical Characteristics of Soil Hydrogen Gas of the Main Seismogenic Structures of Songliao Basin

LI Ji-ye1,2, HU Lan-bin3, KANG Jian1, LI Ying2, WANG Qiang3, SUN Qiang3, ZHANG Yan-xiang1   

  1. 1. Heilongjiang Earthquake Agency, Harbin 150090, Heilongjiang, China;
    2. CEA Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
    3. Harbin Technical Center of Earthquake Prevention and Disaster Reduction, Harbin 150021, Heilongjiang, China
  • Received:2022-04-11 Revised:2022-11-19 Online:2023-01-31 Published:2023-05-15

Abstract: The geological structure in the central part of the Songliao Basin is well-developed, with a complex system of intersecting faults. In the past, the area has experienced several strong earthquakes, with the main seismogenic structures being the Fuyu-Zhaodong Fault and the Hulanhe Fault within the Songliao Basin. Soil hydrogen gas measurements were conducted on the Fuyu-Zhaodong Fault and the secondary faults of Hulanhe Fault, namely the Suihua-Menggushan Fault, revealing significant changes in soil hydrogen gas levels near the active fault zones. The results show that ① the hydrogen gas anomaly threshold concentration ratio for each measuring line in the Fuyu-Zhaodong Fault was 1.8~2.3, with an anomaly peak concentration ratio of 3.0~6.4; ② the hydrogen gas anomaly threshold concentration ratio for each measuring line in the Suihua-Menggushan Fault was 1.8~2.5, with an anomaly peak concentration ratio of 3.5~5.7; ③ comparison of the abnormal background, threshold, and peak concentrations between the two faults indicated that the values for the Fuyu-Zhaodong Fault were significantly higher than those for the Suihua-Menggushan Fault. This may be related to the recent significant seismic activity of the Fuyu-Zhaodong Fault, possibly containing information about the enhancement of pre-earthquake tectonic activity. ④ Significant changes in soil hydrogen gas were observed near active fault zones, which may be related to the nature of the two faults, geological structure units, local stress environments, and the strength of fault activity.

Key words: Geochemistry, Seismogenic tectonics, Soil hydrogen, Songliao Basin

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