摘要:
浅层地温指地表至地下3.2m深处的地温。通过数十年浅层地温变化与强地震活动关系的研究,指出了强地震发生前一段时间0.8m地温与地表温度的相关系数为历年同期最低值;0.8m、1.6m和3.2m地温连续6个月以上为正距平,且平均距平值分别大于0.8、0.7和0.5即认为地温有升温异常;在此时段内地温有历年同期最大值或次大值;做半年尺度或以月为单位的0.8m地温、地表温度平均距平等值线图,等值线的分布圈闭相对升温中心,升温中心区域或其附近即为未来强地震的震中区。文中对1966年3月邢台地震、1976年7月唐山地震和1989年10月大同地震做了详细的地温异常变化分析,并对其异常升温机理进行了探讨,同时还分析了降雨对浅层地温的影响。
Abstract:
The shallow layer geotemperature refers to geotemperature from ground surface to the depth of 3.2m.Through studies of the relationvship between the shallow layer geotemperature variations in the past several decades of years and strong earthquake activity,it has been pointed out that the correlation coefficient of geotemperature at depth of 0.8m and the ground vsurface temperature in a certain time interval before occurrence of strong earthquakes is the lowest value in the same period over the years;the geotemperatures at depth of 0.8m, 1.6m and 3.2m consecutively lasting more than six months are regarded as positive distance averages, and if the mean distance averages are larger than 0.8,0.7 and 0.5 respectively, it is considered that the geotemperatures show temperature-rising anomalies;in this time interval, geotemperature shows largest or second largest value in the same period over the years;plotting half year or monthly isoline nap of mean distance averages of geotemperature at depth of 0.8m and ground surface temperature, with isoline encircling the relative temperature-rising center, the temperature-rising area or its vicinity could be considered as the epicentral area of coming strong earthquakes.A detailed analysis of geotemperature anomalous variations associated with the Xingtai earthquake occurred in March of 1966, Tangvshan earthquake in July of 1976, Datong earthquake in October of 1989 has been made,the mechanism of anomalous temperature rising has been studied.and meanwhile the effect of rainfall on shallow layer geotemperature has also been analyzed.
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