ANOMALY ANALYSIS ON THE OBSERVATIONAL DATA AT THE DONGCHUAN STATION IN THE TONGWEI COUNTY BEFORE THE JISHISHAN M6.2 EARTHQUAKE
An M6.2 earthquake occurred in the Jishishan County,Linxia Prefecture,Gansu Province on De-cember 18th,2023.Before the earthquake,the water temperature and gas radon concentration value of the flu-id observation well at the Dongchuan Station in the Tongwei County were abnormal.By analyzing the observa-tional data of water temperature and gas radon before and after the earthquake,it is found that the water tem-perature value has an abnormal change process of"decreasing—keeping a low value—rising(as the earth-quake occurs)",the gas radon concentration value increased,which is in good correspondence with the de-crease in water temperature value,therefore,it is believed that the change of water temperature and gas radon may be the precursor anomalies before the Jishishan M6.2 earthquake.
The Jishishan M6.2 earthquakeDongchuan station in the Tongwei CountyWater tem-peratureGas radon concentration
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