论文部分内容阅读
系统研究了唐山地震前气象要素的异常变化。地震前约一个月时间，震中及附近地区月平均气压变化幅度最大，月平均气压距平中心区域与震中区吻合，沿区域构造带方向出现气压变化最大梯度区；临震前几天气压有较大幅度的升、降变化过程，升压脊轴向与区域构造带走向吻合。地震前一年，丰润、唐山一带年平均气温距平值最大，地震前一天，气温24小时变温的升温中心在唐山，升温脊受区域构造带控制。0．8m地温亦有明显的升温异常变化。1975年后半年王田－唐山一带是地温平均距平的最大升温中心，至1976年5月，秦皇岛至邯郸各站相对升温幅度各月均为唐山最大。唐山等站1975年是历史地温资料中温度最高的一年（1957～1980），其地温距平从1975年1月至1976年6月连续18个月为正距平。1976年3月浅层地温随深度增加，而其它年份相应的时间段则随深度减小，表明唐山地震前有来自地壳深处的热。
We systematically studied the anomalous changes of meteorological elements before the Tangshan earthquake. About a month before the earthquake, the monthly average pressure in the epicenter and nearby area had the largest change. The monthly average pressure anomaly center coincided with the epicenter area, and the maximum pressure gradient appeared along the tectonic belt in the area. A substantial increase and decrease of the process of change, thrust ridge axial and regional tectonic belt coincide. In the year prior to the earthquake, the mean annual temperature anomalies of Fengrun and Tangshan were the largest. Before the earthquake, the temperature rising center of 24-hour temperature was in Tangshan, and the warming ridge was controlled by the regional tectonic belt. 0.8m ground temperature also showed significant abnormal changes in temperature. In the second half of 1975, the area from Wangtian to Tangshan was the center of maximum temperature anomaly, and by May 1976, the relative temperature rise of each station from Qinhuangdao to Handan was the largest in Tangshan. The station of Tangshan and other stations in 1975 was the highest temperature in historical geothermal data (1957-1980). The ground temperature anomaly level was an anomaly for 18 consecutive months from January 1975 to June 1976. In March 1976, the shallow ground temperature increased with depth, while the corresponding periods of other years decreased with depth, indicating that there was heat from the deep crust before the Tangshan earthquake.