青藏高原北部浅层地温异常特征及中短期地震预测

SHALLOW GEOTHERMAL ANOMALOUS CHARACTE-RISTICS AND MID-SHORT TERM EARTHQUAKE PREDICTION IN THE NORTH OF QINGHAI-XIZANG PLATEAU

利用浅层地温时空演化特征与中强地震活动的关系 ,研究了青藏高原北部地区1 980年以来发生的几次中强地震前浅层地温异常特征。结果表明 :分布在不同地质构造单元的地温测站在地震前有不同的表现形式 ,中强地震发生的中短期异常指标在空间上表现为地热涡的出现、活动和迁移 ,在时间上多数地震以高值异常为主 ,持续时间随震级大小而变化 ,中强地震一般持续 1～ 6个月 ,强震持续时间可达 1～ 2年。

Shallow geothermal anomalous characteristics before a few mid strong earthquakes since 1980 in North Qinghai Xizang Plateau are studied by space time distribution features of shallow geothermal and seismicity.The results indicates that shallow geothermal anomalous characteristics shows many forms in different tectonic units.The mid-short term anomaly before earthquakes is geothermal vortex action and remove,the duration is varied with the intensity of events.