Estimation On Regional Crustal Stability In Wenzhou

Taking Wenzhou city as research area, the regional crustal stability in Wenzhou city is discussed in this paper, based on the studies of the tectonic stability, the stability of rock, soil medium and surface stability.Through collecting many datas, the main faults of the Wenzhou researched and explored systemically, and initially defines that there are 4 main activitily faults to influence stability of Wenzhou. Based on this, the paper also researches systemically about Cenozoic and recent techonic activity, the crustal surface structure and rock-soil mechanical property, seismic activity and risk, surface sedimentation and terrestrial heat abnormity.After confirmed the main factors in influencing the regional crustal stability,there are 6 main genes in this paper applying to the fuzzy mathematics comprehensive assessment method. Then the factors of dominating regional crustal stability are transformed into numerical values, and the subjective function of numerical value of every factor is established. Finally by using comprehensive fuzzy mathematics method, crustal stability evaluate of Wenzhou city is accomplished.Based on stable analysis and fuzzy comprehensive evaluation, the stable grade of each subzone of Wenzhou city is determined.Based the stability analyses and fuzzy mathematics' method, this research area to be possible finally to plot out three stable rank: the relative stability region, compared the stability region and the relative not stability region relatively, the relative stability region of area is about half of the whole Wenzhou city, the relative not stability region of area is smaller, and the main factors working on the relative not stability region are earthquake, activitily faults and effect out side of driver.Conclusion:the activity of faults in Wenzhou region is not stronger, and the earthquake level and intensity is not higher. So the whole crustal stability is better. But earthquake belt peripherally have effect in east region to a certainty, and the some region where northeast faults and northwest faults are join arose earthquake more impossibly. So in city building and selecting important project site in future we shall take into account those.