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《Seismology and Geology》 2013-03
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A PHENOMENON OF GROUND TEMPERATURE CHANGE PRIOR TO LUSHAN EARTHQUAKE OBSERVED IN KANGDING

CHEN Shun-yun;LIU Pei-xun;LIU Li-qiang;MA Jin;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration;  
Recently,the strong earthquakes in China mainland occurred mainly around the Bayanhar block.It is important to monitor the information of ongoing crustal activity at the key tectonic positions.We have developed a set of wireless equipment for measuring the ground temperature in field,and have established a network of measurement of the ground temperature along Xianshuihe Fault.Some changes of temperature were observed before and after the Lushan earthquake on April 20,2013.First of all,an apparent and persistent change of the ground temperature in Kangding appeared,starting from January 31,2013.This temperature variation corresponded with the occurrence of the small earthquakes around the observation station.According to the relationship between the temperature and stress,the abrupt change of ground temperature is essentially the geological stress adjustment.From the viewpoint of geological structures,both Longmengshan Fault and Xianshuihe Fault are the boundary faults of the Bayanhar block,but located at different boundaries,so,Kangding in Xianshuihe Fault is tectonically related to Lushan in Longmengshan Fault.Thus,the temperature change described above would possibly be the precursor of the Lushuan earthquake.
【Fund】: 中国地震局地震行业专项(200808011);; 中国地震局地质研究所基本科研业务专项(IGCEA1301);; 国家自然科学基金(40872129 40902095 41172180)共同资助
【CateGory Index】: P315.72
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