Seismic Intensity Estimation through Questionnaire Survey in the 2008 Wenchuan Earthquake, Sichuan, China

摘要

Seismic intensity around the epicentral area of the 2008 Wenchuan, Sichuan Province of China earthquake is estimated using a questionnaire survey conducted one month after the earthquake. The survey results show that the seismic intensity of Chengdu city is about VII, Beichuan County and Pengzhou Longmenshan Town about X, and Dujiangyan City about IX in MMI scale above all are basically in agreement with the survey results of Chinese Earthquake Administration (CEA). The analysis results show that there are two subjective factors affecting the survey results of seismic intensity: one is the sexuality and the other is age. The seismic intensity value by survey of men is often lower than the women’s. When the surveyed people is elder than 60 years or younger than 19 years, the seismic intensity value by surveyed those people usually is higher than the others’. In general, the questionnaire survey is a good method to estimate the seismic intensity near to the populated area, but it is unsuitable in an unpopulated area.