四川活动断裂带的基本特征

根据大量的实际资料，总结了四川活动断裂带的基本特征：即大致以北东向龙门山断裂带与北西向荣经－马边－盐津断裂带为界，显示了西强东弱的分区活动特点。断裂活动在时间、空间和强度上都具有明显的不均匀性与分段活动特征；晚更新世～全新世以来发生的强震破裂活动大都是沿袭先存断裂进行的，从古地震研究及较短时间尺度（有历史地震记录以来）来看，反映出断层上的位移是以一种地震构造脉冲形式出现

BASIC CHARACTERISTICS OF ACTIVE FAULT ZONES IN SICHUAN PROVINCE

From a large amount of available data in Sichuan Province，this paper deals with basic characteristics of active fault zones.The faulting is of zonal character，stronger in western and weak-er in eastern parts separated by NE-trending Longmenshan fault zone and NW－trending Xingjin-Mabian-Yanjing fault zone，The faulting is homogeneous in time，space，and strength and ofsegmentation character．Rupture cased by strong earthquake usually took place along the exisingfaults since later Pleistocene and Holocene.And displacement along the faults takes the form oftectonic pulsation as found in study of prehistoric earthquakes and instrumental records of seis-micity