摘要
研究了孟连７．３级地震前云南全省及震中距６００ｋｍ范围内跨断层短水准、短基线、地倾斜、水氡、水位、水汞等１３类观测项目，５５个台站，１５１个台项测值的中、短、临异常情况。结果表明，震前中、短、临异常台项百分比为３８％，并主要集中在２００—４００ｋｍ范围。中期异常特征为异常时间长、幅度大。短临异常特征为中期异常趋势结束或测值反向，部分项目出现“巨变”异常及震中附近异常出现晚而外围出现早，随着地震临近其异常月台项数增多。
The medium-short-impending anomalies of 151 station-items at 55 stations occurred before Menglian M=7.3 earthquake in whole Yunnan and within the epicentral distances of 600km, including 13 observations, such as short leveling, short base line, tilt, water radon, water level and water mercury, have been studied. The results show that the percentage for medium-short-impending anomaly station-items is 38% before the earthquake, and mainly concentrated within 200-400 km. Medium anomalies have features of long lasting and big amplitude. Features for short-impending anomalies are that medium anomaly tendency ends or observation varies oppositely, partial items appear dramatic anomalies, earlier outside and later nearby, and monthly station-items of anomalies increase with the earthquake approaching.
出处
《地震研究》
CSCD
北大核心
1997年第4期345-356,共12页
Journal of Seismological Research
关键词
地震预报
地震观测
地震前兆
云南
seismological observation, earthquake prediction, earthquake precursor, Yunnan
