ABSTRACT
Assessment of the crustal stability in the Qingjiang river basin of western Hubei province and its peripheral area is made using fuzzy mathematics and information model proposed as a result of investigations on neotectonic activity and seismic activity in the region. According to data collected over the past four years,the re are six major factors which affect the crustal stability in the region:earthquake activity, fault activity, deep-seated structures, tectonic stress fields, crustal deformation and rock porperties. This is followed by an assessment of the crustal stability of the region which are made by means of two models, fuzzy mathematical judgement and information calculation. As a result, a zonation of the crustal stability is achieved by comparing the results of the two models:four relatively substable subrcgions, seven substable subregions and ten stable subregions. It was found that the three dam sites of the mainstream of the Qingjiang river are all located in the stable subregions.
