Preliminary analysis of the hanging wall effect and velocity pulse of the 5.12 Wenchuan earthquake
Tóm tắt
A preliminary study of the PGA attenuation, hanging wall effect and velocity pulse characteristics from the 2008 Wenchuan earthquake of M
s =8.0 is described in this paper. The study was carried out through analyses in the time and frequency domains of main earthquake records. In the PGA attenuation study, records from 316 stations less than 1000 km from the surface rupture of the fault were used as a database and attenuation relationships were developed and compared with some existing relationships that are widely used in mainland China, Chinese Taiwan and the US. At the same time, records from 28 stations less than 100 km from the fault were used to study the hanging wall effect and velocity pulse characteristics of this earthquake based on the distribution of PGA, PGV, spectral acceleration, and the velocity pulse peak, and the results are compared with the 1999 Chi-Chi earthquake. In addition, the large PGAs of the UD components observed in this event are also discussed in this paper. From the results of the preliminary study, some conclusions are developed and suggestions for further research are proposed.
Tài liệu tham khảo
Campbell KW (1981), “Near-source Attenuation of Peak Horizontal Acceleration,” Bull. Seis. Soc. Am., 71(6): 2039–2070.
Chen YT, Xu LS, Zhang Y, Du HL, Feng WP, Liu C and Li CL (2008), “Analysis of the Source Characteristics of the Wenchuan Earthquake of May 12, 2008,” Report by the Institute of Geophysics (http://www.cea-igp.ac.cn), China Earthquake Administration, on the Wenchuan Earthquake. (in Chinese)
Hu YX (1999), The Technique of the Evaluation of Seismic Safety, Beijing: Seismological Press.
Huo JR (1989), “Study on the Attenuation Laws of Strong Earthquake Ground Motion Near the Source,” Ph.D Thesis, Institute of Engineering Mechanics, China Earthquake Administration. (in Chinese)
Joyner W and Boore D (1981), “Peak Horizontal Acceleration and Velocity from Strong-motion Records Including Records from the 1979 Imperial Valley, California, Earthquake,” Bull. Seism. Soc. Am., 71(3): 2011–2038.
Li XJ, Zhou ZH et al. (2008a), “Preliminary Analysis of Strong Motion Recordings from the Magnitude 8.0 Wenchuan, China Earthquake of May 12, 2008,” Seismological Research Letters, 79(6): 844–854.
Li XJ, Zhou ZH et al. (2008b), “Strong Motion Observations and Recordings from the Great Wenchuan Earthquake,” Earthquake Engineering and Engineering Vibration, 7(3): 235–246
Wang WM, Zhao LF, Li J et al. (2008), “Rupture Process of the M s 8.0 Wenchuan Earthquake of Sichuan, China,” Chinese J. Geophysics, 51(5): 1403–1410. (in Chinese)
Wang QQ, Zhou XX, Zhang PZ et al. (2002), “Characteristic of Amplitude and Duration for Near Fault Strong Ground Motion from the 1999 Chi-Chi, Taiwan Earthquake,” Soil Dynamic and Earthquake Engineering, 22(1): 73–96.
Xu XW, Wen XZ, Yu Shen’e et al. (2008), “Discovery of the Wenchuan M8.0 Earthquake Surface Ruptures and Discussion for Its Seismogenic Structure,” Seismology and Geology, 30(3): 894–926. (in Chinese)
Yuan YF (2008), “Loss assessment of Wenchuan,” Earthquake Engineering and Engineering Vibration, 28(5): 10–19. (in Chinese)