SYNTHETIC NEAR-FIELD SEISMOGRAMS DUE TO RUPTURE-PROPAGATION FAULT MODELS

被引：2

作者：

HIRATA, K

机构：

[1] Department of Geophysics, Faculty of Science, Hokkaido University, Kita-ku

来源：

JOURNAL OF PHYSICS OF THE EARTH | 1992年 / 40卷 / 04期

关键词：

D O I：

10.4294/jpe1952.40.535

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Complete displacement potentials due to kinematic fault models with a bidirectional-bilateral and a fan-shaped rupture-propagations are derived in the Weyl integral representation. Dunkin's formulation of propagator-matrix method is used to compute the seismic responses of a flat-layered medium. Surface displacements are evaluated with the exact wavenumber discretization technique. Fast computation of synthetic near-field seismograms is made with a time-reducing device. A vertically traveling plane S-wave element (VTSE), which relates to contribution of a fault segment just below an observed station to wavenumber responses, in the Weyl integral representation is also participated in the computation. The synthetic near-field seismograms computed show that the contribution of VTSE to wavenumber responses is larger for a lower frequency range or a smaller epicentral distance. This is explained qualitatively by the saddle point approximation of the steepest descent method. Some numerical examples are presented to demonstrate the advantage of our method.

引用

页码：535 / 554

页数：20

共 28 条

[1]

Abe K., Magnitudes of large shallow earthquakes from 1904 to 1980, Phys. Earth Planet. Inter., 27, pp. 72-92, (1981)

[2]

Aki K., Richards P.G., Quantitative Seismology: Theory and Methods, W. H. Freeman and Company, San Francisco, California, 1980. Ben-Menahem, A., Radiation of seismic body waves from a finite moving source in the earth, Bull. Seismol. Soc. Am., 51, pp. 401-435, (1962)

[3]

Bouchon M., Discrete wavenumber representation of elastic wave fields in three-space dimensions, J. Geophys. Res., 84, pp. 3609-3614, (1979)

[4]

Bouchon M., A simple method to calculate Green's functions for elastic layered media, Bull. Seismol. Soc. Am., 71, pp. 959-971, (1981)

[5]

Bouchon M., Aki K., Discrete wavenumber representation of seismic source wave fields, Bull. Seismol. Soc. Am., 67, pp. 259-277, (1977)

[6]

Burridge R., Knopoff L., Body force equivalents for seismic dislocations, Bull. Seismol. Soc. Am., 54, pp. 1875-1888, (1964)

[7]

Cagniard L., Flinn E.A., Dix C.H., Reflection and Refraction of Progressive Seismic Waves, McGraw-Hill, New York, 1962. Chouet, B., Representation of an extended seismic source in a propagator-based formalism, Bull. Seismol. Soc. Am., 77, pp. 14-27, (1987)

[8]

de-Hoop A.T., Representation theorems for the displacement in an elastic solid and their application to elastodynamic diffraction theory, Thesis, (1958)

[9]

Dunkin J.W., Computation of modal solutions in layered, elastic media at high frequencies, Bull. Seismol. Soc. Am., 55, pp. 335-358, (1965)

[10]

Fuchs K., Miiller G., Computation of synthetic seismograms with the reflectivity method and comparison with observations, Geophys. J. R. Astron. Soc, 23, pp. 417-433, (1971)

← 1 2 3 →