四川理塘毛垭温泉水温异常特征及映震能力研究

The Research of Temperature Anomaly of Maoya Thermal Spring in Litang, Sichuan and Its Ability on Reflecting Earthquake

摘要: 四川理塘毛垭温泉是川西地区的地震异常敏感泉，自记录以来，该水温在很多强震前出现了明显的异常变化。通过对理塘毛垭温泉水温历史资料的梳理，认为理塘毛垭温泉水温的异常特征主要以突升–回落–发震和突升–持续–发震异常为主，其下降异常变化也能对应地震，但效果明显不如上升异常。对异常出现时间与发震时间的相关性研究表明，异常出现至发震的最优势时间为40天~50天以内。对异常映震情况研究表明，该温泉的水温异常对周围200 km范围5级地震映震能力较弱，对周围300 km范围6级地震和600 km范围内6级及以上地震效果较好，占比分别为58%和59%。

Abstract: The Maoya thermal spring in Litang, Sichuan is susceptible on earthquake’s anomaly on western Sichuan; the temperature of the spring has obvious change before a lot of earthquake. After sorting out the historic temperature materials of the thermal spring, the mainly anomaly’s features before earthquake are temperature’s sudden rising-fall after rising-earthquake eruption and temperature’s sudden rising-sustaining-earthquake eruption. The sudden fall could also indicate earthquakes but is not effective as the sudden rising. The optimal time interval of anomaly’s appearance and earthquake’s eruption is 40 days to 50 days. The temperature’s anomaly is not a great indicator factor of M5 earthquake within 200 kilometers of the thermal spring but it has preferable reflection of M6 earthquake within 300 kilometers and the magnitude bigger than M6 within 600 kilometers. The ratio for earthquake’s eruption and the anomalies of the last two affairs could reach 58% and 59%.