Preliminary study on the relationship between abnormal bedrock ground temperature changes and earthquake occurrence of Lijiang-Xiaojinhe fault
In this paper,we use high-precision ground temperature observation data of bedrock from five observation sites near the Lijiang-Xiaojinhe fault and analyze them in comparison with seismic activities in the same region.We found several earthquakes occurring within a certain range,after the abnormal changes of bedrock ground temperature.The results showed that:① no obvious anomalies in bedrock ground temperature were observed before the Ninglang MS 5.5 earthquake;however,after the MS 5.5 earthquake and before the Ninglang MS 4.6 earthquake,obvious anomalies in bedrock ground temperature were observed,accompanied by macroscopic anomalies.② The bedrock ground temperature anomalies are different in magnitude and show different change patterns at different tectonic locations,showing the complexity of the anomaly distribution.In conclusion,the bedrock ground temperature anomalies along the Lijiang-Xiaojinhe fault have a better seismic reflection effect on the earthquakes near the rupture zone,but they also show the complexity of the anomaly distribution,which needs further study with more earthquake cases.
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