一、前言晋冀蒙交界地区(E111°—116°,N39°—41°30′)位于山西断陷地震带与阴山—燕山地震带交汇地区,构造上具有强震背景,是历史上强震活动的主要场所之一。近年来该区先后发生了和林格尔6.3级地震和丰镇5.8级地震,地震形势引人瞩目。本文侧重研究了上述两个地震震前地震活动和测震学指标的前兆特征,并粗略分析了怀来地5.4级地震的一些特点。 I. INTRODUCTION The boundary area between Shanxi, Hebei and Mongolia (E111 ° -116 °, N39 ° -41 ° 30 ’) is located in the intersection of the Shanxi fault zone and the Yinshan-Yanshan seismic zone and has strong earthquake background in the structure. It is a historical strong earthquake One of the main venues for activities. In recent years, there have been a magnitude 6.3 earthquake in Helinger and a grade 5.8 earthquake in Fengzhen in the area, and the earthquake situation has drawn much attention. This paper focuses on the precursory features of the seismogenic and seismological indices before the above two earthquakes and briefly analyzes some characteristics of the Huailai M 5.4 earthquake.