【摘要】 本文研究了云南地区１５００年以来Ｍ≥７级地震前３０年内震中周围１５０ｋｍ范围内５～６级地震的空间分布图象，震前平静是一个共同的特点，并大致可以分为三种类型：平静型—７级强震在平静７—１８年后突然发生；平静活跃型—在平静多年后，首先发生早期信号震，再发生７级强震；活跃型—平静多年后中强震持续活动十几年，接着发生强震。更多还原

【Abstract】 Spacial patterns of earthquakes with M=5-6 30 years before M≥7 earthquakes, within radius of 150km,have been studied since 1500 in this paper. Quiescence before strong earthquakes is a common feature which can roughly be divided into 3 types: quiescent typestrong earthquake with M=7 suddenly happens after 7=18 years quiescence ; quiscent-active type-signal earthquakes occurs first followed by strong earthquake after many years quiescence: active type moderate-strong earthquakes have been lasting more than 10 years followed by strong earthquake after long period quiscence.更多还原