近年来,太平洋东岸的火山活动、地震活动具有加强的趋势。于是美国在加利福尼亚州投入了大量的人力、物力。采用了计算机、激光、卫星等先进技术,进行地震预报试验,目前已经获得了一些成功。例如,1981年地震学家就预测在墨西哥海岸地区可能发生地震活动,85年9月份,果然在这里发生了里氏8.1级的地震,使数千人伤亡。美国地质勘探局的比尔·巴昆教授根据地震预报的空白带理论,成功地预报了沿加利福尼亚著名的圣安德列斯断层发生的一次地震。他利用几台叫做迪拿多仪的地应力仪记录了地下200米深处的压力变化。研究了旧金山以南某一地区的地震波谱,然后他从过去的地震记录推算出哪些地区地应力在增加,以及断层 In recent years, the volcanic activity and earthquake activity on the east coast of the Pacific Ocean have been strengthened. So the United States invested a lot of manpower and material resources in California. The use of advanced technologies such as computers, lasers and satellites for earthquake prediction experiments has yielded some success. For example, in 1981, seismologists predicted that earthquakes could occur in the Mexican coast. In September 1985, an earthquake measuring 8.1 on the Richter scale struck here, killing thousands of people. Professor Bill Paquin of the United States Geological Survey succeeded in predicting an earthquake that occurred along the famous San Andres Fault in California, based on the theory of blank banding in earthquake prediction. He used several sets of geostresses called the Dinetto to record changes in pressure 200 meters underground. After studying the seismic spectrum of a region south of San Francisco, he then deduced from past seismograms which areas had increased in-situ stress and faults