Preliminary Study on Two Newly-Generated Seismotectonic Zones in North and Southwest China

摘要

In 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. As distinguished 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 of their characteristics, and shows their significance.