SECONDARY LOVE WAVES OBSERVED BY A STRONG-MOTION ARRAY IN THE TOKYO LOWLANDS, JAPAN

被引：39

作者：

KINOSHITA, S

FUJIWARA, H

MIKOSHIBA, T

HOSHINO, T

机构：

[1] National Research Institute for Earth Science and Disaster Prevention

[2] Institute of Civil Engineering of the Tokyo Metropolitan Government, Koto-ku

来源：

JOURNAL OF PHYSICS OF THE EARTH | 1992年 / 40卷 / 01期

关键词：

D O I：

10.4294/jpe1952.40.99

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In order to investigate the generation and propagation of Love waves recorded in the Tokyo lowlands, we analyzed array data obtained for six events that occurred around the Kanto district. From wavenumber analysis, the following conclusions are obtained. (1) Love waves are converted from direct S-waves at the edge of a sedimentary basin. The Hachiohji tectonic line is an especially important zone for the generation of Love waves. (2) Apparent velocities of Love waves for periods between 6 and 9 s are concordant with the phase velocities of fundamental mode Love waves calculated from a three-layered model. The first, second, and third layers in the model have S-wave velocities of 0.5, 0.8, and 1.2 km/s, respectively. The S-wave velocity in the pre-Tertiary basement is assumed to be 2.6 km/s.

引用

页码：99 / 116

页数：18

共 22 条

[1]

Aki K., Larner K.L., Surface motion of a layered medium having an irregular interface due to incident plane SH waves, J. Geophys. Res., 75, pp. 933-954, (1970)

[2]

Bard P.Y., Bouchon M., The seismic response of sediment-filled valleys. Part I. The case of incident SH waves, Bull. Seismol. Soc. Am., 70, pp. 1263-1286, (1980)

[3]

Bard P.Y., Bouchon M., The two-dimensional response of sediment-filled valleys, Bull. Seismol. Soc. Am., 75, pp. 519-541, (1985)

[4]

Bard P.Y., Gariel J.C., The seismic response of two-dimensional sedimentary deposits with large vertical velocity gradients, Bull. Seismol. Soc. Am., 76, pp. 343-346, (1986)

[5]

Fujiwara H., Approximation method for surface waves generated in large sedimentary plain, Programme and Abstract of Seismological Society of Japan, 2, (1991)

[6]

Horike M., Uebayashi H., Takeuchi Y., Seismic responses of a three-dimensional sedimentary basin with an irregular interface, Programme and Abstract of Seismological Society of Japan, 21, (1989)

[7]

Kinoshita S., Propagation of total reflected plane SH pulses in a dipping layer, Zisin, 38, pp. 597-608, (1985)

[8]

Kinoshita S., Lattice filtering applications to earthquake observation, Zisin, 39, pp. 1-14, (1986)

[9]

Kinoshita S., Mikoshiba T., Fujiwara H., Strong-motion array in the Tokyo lowlands, Proceedings of the eighth Japan Earthquake Engineering Symposium, pp. 493-498, (1990)

[10]

Komazawa M., Hasegawa I., The graben structure suggested by the gravimetric basement in the Kanto district, central Japan, Mem. Geol. Soc. Jpn., 31, pp. 57-74, (1988)

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