我国华北和西南地区两条新生地震构造带的初步研究

PRELIMINARY STUDY ON TWO NEWLYGENERATED SEISMOTECTONIC ZONES IN NORTH AND SOUTHWEST CHINA

在以往的地震构造研究中，注重了那些继承活动的断裂带．但在与现今区域地质环境和应力场性质基本保持一致的最近构造阶段，还有正在产生的新断裂带，即新生断裂带．我国华北和西南地区由地震活动揭示出的北东向唐山－河间－磁县和北西向腾冲－耿马－澜沧两条地震带，对应的正是新生断裂带．为示区别，称其为新生地震构造带．以这两条地震构造带为例，从地震活动和地质构造方面论证它们的存在，初步分析它们的特征和研究意义．

n previous seismotectonic studies,the emphasis was placed on the inherited active fault zones.In the recent tectonic stage that essentially keeps in step with the current regional geologic environment and the stress field,however,there are also some newlygenerated fault zones.By studying the seismicity in North and Southwest China,it has been known that the NEtrending TangshanHejianCixian and NWtrending TengchongGengmaLancang seismic zones are just two newlygenerated fault zones.To distinguish them from the inherited fault zones,they are called the newlygenerated seismotectonic zones.This paper deals with the existence of these two seismogenic zones from their seismicity and geological structures,gives a preliminary analysis on their characteristics and shows their significance.