美国首次正式承认一次地震预报。国家地震预报评价委员会已承认,在今后的8年里,加利福尼亚州帕克菲尔德附近将发生一次5.5—6级地震的“预报”。帕克菲尔德是大致位于洛杉机和旧金山之间的中途,圣安德烈斯断层上的一个34户居民的不重要的小镇。已分析过,自1857年以来,大约每22年,就有一次特征相似的地震历史,每次都发生在5公里宽、3—8公里深和25公里长的一条带内,这个断裂带现在正在用一组激光测距仪、 For the first time, the United States officially acknowledged an earthquake prediction. The National Seismic Forecasting Commission has acknowledged that there will be a “forecast” of 5.5-6 earthquakes near Parkfield, California, over the next eight years. Parkfield is an insignificant town roughly 34 inhabitants halfway between Los Angeles and San Francisco on the San Andres Fault. It has been analyzed that, since about 1857, there is a characteristic earthquake history about every 22 years, each occurring in a zone 5 km wide, 3-8 km deep and 25 km long, which now Is using a laser rangefinder,