信号性震中迁移

SIGNAL EARTHQUAKE MIGRATION

摘要:

关于震中迁移现象已有不少人进行过研究。1966年郭增建等同志研究了甘肃和宁夏地区发生的破坏性地震的迁移规律,提出了可以把震中迁移现象作为地震预报的一种方法,並指出未来大震最可能是沿着原来的极震区长轴方向、弱震带延伸方向和发展构造延伸方向迁移^[1]。1966年邢台地震后,人们根据震中迁移预报过1967年河间6.3级地震和1975年海城7.3级地震。1980年郭增建、秦保燕同志编制了全国震中迁移略图^[2],该图给出了中国大陆主要的地震迁移带。1981年在该图所给出的道孚至民丰迁移带上再次出现了破坏性地震的迁移现象。

Abstract:

Studying earthquake migration has some significance for the earthquake prediction. In the earlier research, the earthquake migration could only be used in predicting its direction in stead of pointing out the earthquake region.
In this paper, the author studied the seismicity before some strong earthquakes in China and found that the earthquake risk region may be determined by usingsignal earthquake migration. These signal earthquakes may be divided into two kinds:1. signal earthquakes occurred in the tectonic zones refuted to the tectonic junction region by targe earthquake. 2. signal earthquakes of repeat migration across seismic gap. Using these signal earthquakes we can roughly estimate where the earthquake risk region is.