【摘要】 通过对中国1980~2004年6月期间5级以上地震的研究,统计中国西部、华南、华北5级以上地震震前是否有系列小地震发生。结果表明:5级以上地震在震前不同时期,距震中近距离范围内有系列的小地震发生;在6级地震前50km范围内有系列3~4级地震发生,概率为44%左右;西部7级地震前会有系列的4~6级地震发生,发生4级地震的概率为44%左右,发生5~6级地震的概率为11%左右。更多还原

【Abstract】 By means of the research on the events of M≥5.0 in China that occurred during the period from January 1980 to June 2004, the occurring of minor earthquakes before the events of M≥5.0 in Western, Northern and Southern China region was statistically studied. The result indicates that before a mainshock of M >5.0, a series of minor events in the different period and distances away from epicenters for the M≥5.0 events would occurred. The probability of earthquakes of M 6.0 with a series of pre-seismic events of M_L 3.0 to 4.0 occurred within 50 km away from its epicenter is 44%. However, before a mainshock of M 7.0 in western China, a series of events of M_L 4.0, M 5.0 and 6.0 occurred. The probability for the pre-seismic events of M_L 4.0 is 44% and 11% for those of M 5.0 and 6.0.更多还原