汶川8.0级地震与云南东部主要构造带强震关联性研究

Correlation between the Wenchuan M_S8.0 Earthquake and Strong Earthquakes on Main Tectonic Zones in Eastern Yunnan

根据川滇区域构造及应力场背景系统研究了川滇强震活动时空分布特征,并根据川滇强震所处构造的关联性深入研究了川青块体东西两边界断裂构造带、川滇菱块东边界断裂构造带强震活动的盛衰演变规律及三大断裂构造带强震互动性、相关性,以此探讨汶川8.0级地震对云南特别是云南东部主要断裂带强震活动的影响,并通过对云南东部中小地震活动的频度、b值、地震危险度D值等参数动态变化的深入研究,对该区强震孕育的可能性进一步作了定量的、科学的论证。

The Sichuan-Yunnan area is composed of Sichuan-Qinghai block and Sichuan-Yunnan rhombic block.The rupture zones at the eastern and western boundaries of the Sichuan-Qinghai block and the eastern boundary of the Sichuan-Yunnan block are main tectonic zones in eastern Yunnan.We analyze the spatio-temporal distribution features of strong earthquake activity in the Sichuan-Yunnan area according to regional tectonics and background stress field,and further study the evolution rule of the strong earthquake activities on the three rupture tectonic zones,and the interaction and relation between them.Based on above analyses we discuss the influence of the Wenchuan earthquake on the strong earthquake activity in Yunnan,especially on those on the major rupture zones in eastern Yunnan,and analyze the possibility of strong shock in this area quantitatively and scientifically according to the dynamic changes of frequency of small shocks,b value,and seismic risk D value in eastern Yunnan.