2008年5月12日汶川地震谱震级及相关问题研究(英文)
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摘要
基于P波和S波的谱震级特征对汶川地震进行了定量研究,可以看出P波和S波的最大谱震级出现在不同的周期上。对这一现象的构造物理意义进行了讨论,推测相对于P波而言,地震发生期间辐射的S波能量来自异常大的震源体积。选择部分全球地震的谱特征为背景,对汶川地震的体波谱震级特征进行了分析,结论是汶川地震的特征与其所处的周边环境是一致的。
The Sichuan earthquake is quantified on the basis of its spectral magnitudes of the P-and of the S-waves.The maximum spectral magnitudes of the two waves are seen to occur at different periods.The tectonophysical significance of the finding is discussed, and it is deduced from it that the S-wave energy radiated during the earthquake was drawn from unusually large volume, if compared to the volume corresponding to the P-waves.The spectral features of the body waves of the Sichuan earthquake are analysed on the background of the spectral features of a selection of worldwide earthquakes.As a result it is concluded that the Sichuan earthquake fits well into the features of the earthquakes in the surrounding regions.
The Sichuan earthquake is quantified on the basis of its spectral magnitudes of the P-and of the S-waves.The maximum spectral magnitudes of the two waves are seen to occur at different periods.The tectonophysical significance of the finding is discussed, and it is deduced from it that the S-wave energy radiated during the earthquake was drawn from unusually large volume, if compared to the volume corresponding to the P-waves.The spectral features of the body waves of the Sichuan earthquake are analysed on the background of the spectral features of a selection of worldwide earthquakes.As a result it is concluded that the Sichuan earthquake fits well into the features of the earthquakes in the surrounding regions.
引文
Aki K, Richards PG.. 1980. Quantitative Seismology, Theory and Methods. W.H. Freeman and Company, San Francisco, 932 pp.
Burchfiel BC, Royden LH, van der Hilst RD, Hager BH, Chen Z, King RW, Li C, Lü J, Yao H, Kirby E. 2008. A geological and geophysical context for the Wenchuan earthquake of 12 May 2008, Sichuan, People’s Republic of China. The Geological Society of America, on line publications, 18: 4-11.
-erveny V, Jansky J. 1983. Ray amplitudes of seismic body waves in inhomogeneous radially symmetric media. Studia geoph. et geod., 27: 9-18.
Duda SJ. 1970. The earthquake volume. Bull Seism Soc Am, 60: 1479-1489.
Duda SJ. 1972. Body-wave strain and the earthquake volume. Tectonophysics, 14: 333-343.
Duda SJ. 2007. Tomography of Seismic P-Waves from Earthquakes and Explosions-(Part I Basic concepts and Theory). CT Theory and Applications, 16(1): 25-34.
Duda SJ, Jansky J. 2008. The Earthquake Volume from Body Waves. CT Theory and Applications, 17(4): 32-46.
Duda SJ, Xu SX. 1988. Broad-band seismograms, band-pass seismograms, and spectral magnitudes for a selection of 1978-1983 explosions-comparison with worldwide earthquakes. Institut für Geophysik, Universit-t Hamburg, 105 pp.
Duda SJ, Yanovskaya TB. 1993. Spectral amplitude-distance curves for P-waves: Effects of velocity and Q-distribution. Tectonophysics, 217: 255-265.
Duda SJ, Yanovskaya TB. 1994. Calibrating functions for P-wave spectral magnitudes. Acta Geoph Polonica, 42: 293-306.
Gutenberg B, Richter Ch. 1956. Magnitude and Energy of Earthquakes. Annali di Geofisica, 9: 1-15.
Lyskova EL, Roslov YV, Yanovskaya TB, Duda SJ. 1998. Verification and refinement of spectral magnitude calibrating functions for P-waves. J Seismol, 2: 117-124.
Nishimura N, Yagi Y. 2008. Rupture process for May 12, 2008 Sichuan Earthquake (Ver.2), http://www.geol.tsukuba.ac.jp/~nisimura/20080512/
Nortmann R, Duda SJ. 1982. The amplitude spectra of P-and S-waves and the body wave magnitude of earthquakes. Tectonophysics, 84: 17-32.
Nortmann R, Duda SJ. 1983. Determination of spectral properties of earthquakes from their magnitudes. Tectonophysics, 93: 251-275.
Sarkar D, Duda SJ. 1985. Spectral P-wave magnitudes, Aki's omega-square model and source parameters of earthquakes. In: Duda SJ, Vanek J (Editors), Quantification of Earthquakes, Tectonophysics, 118: 175-194.
Wielandt E. 2001. Basics of the volume-source model and its application in volcano seismology. Institut für Geophysik, Universit-t Stuttgart, 8pp.
Yanovskaya TB, Duda SJ. 1994. Q(T) for short periods from broadband observations of P-waves. Acta Geophys Pol, 42: 281-292.
Burchfiel BC, Royden LH, van der Hilst RD, Hager BH, Chen Z, King RW, Li C, Lü J, Yao H, Kirby E. 2008. A geological and geophysical context for the Wenchuan earthquake of 12 May 2008, Sichuan, People’s Republic of China. The Geological Society of America, on line publications, 18: 4-11.
-erveny V, Jansky J. 1983. Ray amplitudes of seismic body waves in inhomogeneous radially symmetric media. Studia geoph. et geod., 27: 9-18.
Duda SJ. 1970. The earthquake volume. Bull Seism Soc Am, 60: 1479-1489.
Duda SJ. 1972. Body-wave strain and the earthquake volume. Tectonophysics, 14: 333-343.
Duda SJ. 2007. Tomography of Seismic P-Waves from Earthquakes and Explosions-(Part I Basic concepts and Theory). CT Theory and Applications, 16(1): 25-34.
Duda SJ, Jansky J. 2008. The Earthquake Volume from Body Waves. CT Theory and Applications, 17(4): 32-46.
Duda SJ, Xu SX. 1988. Broad-band seismograms, band-pass seismograms, and spectral magnitudes for a selection of 1978-1983 explosions-comparison with worldwide earthquakes. Institut für Geophysik, Universit-t Hamburg, 105 pp.
Duda SJ, Yanovskaya TB. 1993. Spectral amplitude-distance curves for P-waves: Effects of velocity and Q-distribution. Tectonophysics, 217: 255-265.
Duda SJ, Yanovskaya TB. 1994. Calibrating functions for P-wave spectral magnitudes. Acta Geoph Polonica, 42: 293-306.
Gutenberg B, Richter Ch. 1956. Magnitude and Energy of Earthquakes. Annali di Geofisica, 9: 1-15.
Lyskova EL, Roslov YV, Yanovskaya TB, Duda SJ. 1998. Verification and refinement of spectral magnitude calibrating functions for P-waves. J Seismol, 2: 117-124.
Nishimura N, Yagi Y. 2008. Rupture process for May 12, 2008 Sichuan Earthquake (Ver.2), http://www.geol.tsukuba.ac.jp/~nisimura/20080512/
Nortmann R, Duda SJ. 1982. The amplitude spectra of P-and S-waves and the body wave magnitude of earthquakes. Tectonophysics, 84: 17-32.
Nortmann R, Duda SJ. 1983. Determination of spectral properties of earthquakes from their magnitudes. Tectonophysics, 93: 251-275.
Sarkar D, Duda SJ. 1985. Spectral P-wave magnitudes, Aki's omega-square model and source parameters of earthquakes. In: Duda SJ, Vanek J (Editors), Quantification of Earthquakes, Tectonophysics, 118: 175-194.
Wielandt E. 2001. Basics of the volume-source model and its application in volcano seismology. Institut für Geophysik, Universit-t Stuttgart, 8pp.
Yanovskaya TB, Duda SJ. 1994. Q(T) for short periods from broadband observations of P-waves. Acta Geophys Pol, 42: 281-292.
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