福建地区温泉对中国台湾6级以上地震映震能力分析  

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

作　　者：廖丽霞[1] 陈伟[1] 周跃勇[1] LIAO Lixia;CHEN Wei;ZHOU Yueyong(Fujian Earthquake Agency,Fuzhou 350003,Fujian,China)

机构地区：[1]福建省地震局,福建福州350003

出　　处：《地震研究》2025年第2期312-325,共14页Journal of Seismological Research

基　　金：中国地震局地震科技星火计划攻关项目(XH21013)。

摘　　要：为监测预测闽台地震,沿福建地区主要构造部位布设了16个温泉点,构建了构造地球化学观测网,观测温泉气体中的氦氖碳同位素、氢气浓度及体积占比、气体流速、水化学离子等用于短临地震预测研究。基于2021年1月—2023年6月这16个温泉点的地球化学参数观测结果,探讨了其对研究时段内以2022年中国台湾花莲ML6.8震群为代表的中国台湾地区发生的芮氏6级以上地震的映震能力。结果表明:(1) 6级以上地震发生前福建地区温泉地球化学出现群体性异常且具重现性。温泉气体表现突出,以高值异常为主;水化学离子主要呈趋势上升、持续高值、震荡等异常形态;这些异常对强震发震时间具有较好的短临和短期预测意义。(2)福建地区的构造背景与中国台湾地区6级以上地震的关联性较强。台湾地震多为板块碰撞俯冲引起,其应力能通过深大断裂的深部动力传导引起福建温泉的响应,导致温泉气体及水化学离子产生异常;福建地区特有的中酸性岩浆岩地球化学背景也是水化学离子映震灵敏的因素之一。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.,2021 to Jul.,2023,this paper discusses the seismic reflection ability of Fujian hot spring geochemistry on the M_(L)6.8 earthquake in Hualian,Taiwan in 2022 and other earthquakes of magnitude M_(L)6 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.The 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.

关 键 词：中国台湾6级以上地震 预测指标 福建地区温泉 构造地球化学观测网 温泉气 水化学离子 

分 类 号：P315.723[天文地球—地震学]