近十几年来,国内外对于大地震、中等地震前地震空区的研究逐步展开,初期一些学者曾提出板块边缘发生的大地震余震带之间的空区概念,随后述及板内大地震的空区问题。近几年,随着区域微震观测研究的深入,已由这些背景空区(利用历史地震或中等地震资料勾画的空区,仅指出可能的发震地点)的探讨,进到大、中地震前兆空区(利用微震资料勾画的空 In the past ten years or so, the researches on the large earthquake and medium earthquakes before the earthquake have been carried out gradually. At first, some scholars proposed the concept of the empty space between the large aftershocks of the plate margin. Then, Empty area problem. In recent years, with the deepening of microseismic observational research in the region, the exploration into large and medium earthquakes precursors has been made through the exploration of these background vacancies (empty areas sketched by historical or moderate seismic data and only pointed out possible seismogenic sites) Empty area (the use of microseismic data outlined empty