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[1]LIAO Lixia,CHEN Wei,ZHOU Yueyong.Discussion on Geochemical Observation Anomaly and Mechanism of Fujian Hot Springs before Earthquakes of Magnitude 6 and above in Chinese Taiwan[J].Journal of Seismological Research,2025,(02):312-325.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0033 ]

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Discussion on Geochemical Observation Anomaly and Mechanism of Fujian Hot Springs before Earthquakes of Magnitude 6 and above in Chinese Taiwan

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 02 Page number: 312-325 Column: Public date: 2025-02-10

Title:: Discussion on Geochemical Observation Anomaly and Mechanism of Fujian Hot Springs before Earthquakes of Magnitude 6 and above in Chinese Taiwan

Author(s):: LIAO Lixia; CHEN Wei; ZHOU Yueyong; (Fujian Earthquake Agency,Fuzhou 350003,Fujian,China)

Keywords:: earthquakes with M_L6 or above in Taiwan region; prediction index; hot springs in Fujian region; tectono-geochemical observation network; hot spring gas; hydrochemical ion

CLC:: P315.723

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0033

Abstract:: In order to monitor and predict earthquakes in Fujian and Taiwan of China,we have set up a geochemical observation network at 16 hot spring sites along the main tectonic parts of Fujian,observing the helium-neon-carbon isotope,hydrogen concentration and volume ratio,gas flow rate,and hydrochemical ions in the hot spring gas for short-term and imminent seismic prediction research.Based on the observation results from Jan.[KG-*2],2021 to Jul.[KG-*2],2023,this paper discusses the seismic reflection ability of Fujian hot spring geochemistry on the M_L6.8 earthquake in Hualian,Taiwan in 2022 and other earthquakes of magnitude M_L6 and above that occurred between 2021 and Jul.,2023.The results show that:①Before the earthquake,there were group anomalies in the geochemistry of Fujian hot springs with reproducibility; Hot spring gases are more prominent,with high value anomalies predominating; the main abnormal forms of hydrochemical ions are upward trend,sustained high values,and oscillations; anomalies have good short-term and imminent prediction significance for the occurrence of strong earthquakes.②The tectonic pattern of Fujian is closely related to Taiwan,and Taiwan earthquakes are mostly caused by plate collision and subduction.The stress can cause the response of Fujian hot springs through deep dynamic conduction of deep faults,leading to anomalies in hot spring gases and hydrochemical ions; The unique mid-acidic geochemical background in Fujian is also one of the factors that contribute to the sensitivity of hydrochemical ions to earthquakes.

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Last Update: 2025-03-10