Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by KURITA, T. Search for Related Content GeoRef GeoRef Citation

A procedure for elucidating fine structure of the crust and upper mantle from seismological data

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91109

Abstract

A formulation is presented to elucidate the layered structure down to a depth of over 200 km from long-period body-wave records of teleseismic deep-focus earthquakes. This formulation utilizes the ratios of vertical to horizontal motions of P and SV waves, and the ratio of SH motion to horizontal motion of SV waves. A strong advantage of the basic assumption of this method is that a postulation of horizontal parallel layering is limited to a few hundred kilometers. A two-step procedure is proposed and justified which makes a separate determination of the structure of crust and upper mantle. In each step, the truncated transfer ratio is used in which factors naturally incorporated in observed spectra, such as finiteness of the record, data window, instrumental response, source function, and later phases are all taken into account. Methods are developed to evaluate effects of the noise and the deviation of the direction of wave approach on the transfer ratio. This formulation makes it possible to elucidate the fine, regionalized structure of the crust and upper mantle such as transitional layering and details of the upper-mantle low-velocity zone.

A routine procedure for determining fine structure of the crust and upper mantle around recording stations is proposed. This cyclic procedure is a combined study of all available seismological methods such as body-wave transfer ratios, surface-wave dispersion, travel times, and synthetic seismograms, and a study of body-wave transfer ratios is in the heart of it. This approach leads to an unambiguous estimation of the layered structure in the upper part of the Earth.

This article has been cited by other articles:

				R. GIR, S. M. G. SUBHASH, and M. A. CHOUDHURY Investigation of crustal structure by the analysis of reverberation periodicities Bulletin of the Seismological Society of America, October 1, 1978; 68(5): 1387 - 1397. [Abstract] [PDF]

				L. J. BURDICK and C. A. LANGSTON Modeling crustal structure through the use of converted phases in teleseismic body-wave forms Bulletin of the Seismological Society of America, June 1, 1977; 67(3): 677 - 691. [Abstract] [PDF]

				C. A. LANGSTON Corvallis, Oregon, crustal and upper mantle receiver structure from teleseismic P and S waves Bulletin of the Seismological Society of America, June 1, 1977; 67(3): 713 - 724. [Abstract] [PDF]

				L. S. LEONG Crustal structure of the Baltic Shield beneath Umea, Sweden, from the spectral behavior of long-period P waves Bulletin of the Seismological Society of America, February 1, 1975; 65(1): 113 - 126. [Abstract] [PDF]

				T. KURITA Attenuation of shear waves along the San Andreas fault zone in central California Bulletin of the Seismological Society of America, February 1, 1975; 65(1): 277 - 292. [Abstract] [PDF]

				T. KURITA Regional variations in the structure of the crust in the central United States from P-wave spectra Bulletin of the Seismological Society of America, October 1, 1973; 63(5): 1663 - 1687. [Abstract] [PDF]