Abstract
In this paper, regionalP-wave upper mantle structure is investigated using slant-stack velocity analysis of short-period earthquake data recorded at station MAJO (Matsushiro, Japan). Shallow earthquakes from 1980–1986 within 35° of MAJO are used to construct a common receiver gather. Processing of the wavefield data includes focal depth and static time corrections, as well as deterministic deconvolution, in order to equalize pulse shapes and align wavelets on the first arrivals. The processed wavefield data are slant stacked and interatively downward continued to obtain a regional upper mantle velocity model. The model includes a low velocity zone between 107 and 220 km. Beneath the LVZ, the velocity increases smoothly down to the discontinuity at 401 km. In the transition zone, the velocity model again increases linearly, although there is some suggestion of further complexity in the downward continued wavefield data. At the base of the transition zone, a second velocity discontinuity occurs at 660 km, with a linear velocity gradient below. In addition to slant-stack analysis, travel times and synthetic seismograms are computed and compared with the processed and unprocessed wavefield data.
Similar content being viewed by others
References
Aki, K., andRichards, P.,Quantitative Seismology, Theory and Methods (W. H. Freeman, San Francisco 1980).
Clayton, R. W. andMcMechan, G. A. (1981),Inversion of Refraction Data by Wavefield Continuation, Geophys.46, 860–868.
Červený, V., andPšenčík, I.,SEIS83-Numerical modeling of seismic wavefields in 2-D laterally varying layered structures by the ray method. InDocumentation of Earthquake Algorithms (E. R. Engdahl, ed.) (USGS Report SE-35 1984) pp. 36–40.
Cummins, P. R., Kennett, B. L. N., Bowman, J. R., andBostock, M. G. (1992),The 520 km Discontinuity?, Bull. Seismol. Soc. Am.82, 323–339.
Diebold, J. B., andStoffa, P. L. (1981),The Travel Time Equation, Tau-P Mapping, and Inversion of Common Midpoint Data, Geophys.46, 238–254.
Dziewonski, A. M. andAnderson, D. L. (1981),Preliminary Reference Earth Model, Phys. Earth Planet. Inter.25, 297–356.
Fukao, Y. (1977),Upper Mantle P Structure on the Ocean Side of the Japan-Kurile Arc, Geophys. J. R. Astr. Soc.50, 621–642.
Fukao, Y., Obayashi, M., Inoue, H., andNenbai, M. (1992),Subducting Slabs Stagnant in the Mantle Transition Zone, J. Geophys. Res.97, 4809–4822.
Gerver, M. L., andMarkushevitch, V. (1966),Determination of a Seismic Wave Wave Velocity from the Travel Time Curbe, Geophys. J. R. Astr. Soc.11, 165–173.
Gilbert, F., andDziewonski, A. M. (1975),An Application of Normal Mode Theory to the Retrieval of Structural Parameters and Source Mechanisms from Seismic Spectra, Phil. Trans. R. Soc. Lond.278, A 1280, 187–268.
Herrin, E. (1968),Introduction to “1968 Seismological Tables for P Phases”, Bull. Seismol. Soc. Am.58, 1193–1241.
Jones, L. E., Mori, J., andHelmberger, D. V. (1992),Short-period Constraints on the Proposed Transition Zone Discontinuity, J. Geophys. Res.97, 8765–8774.
Revenaugh, J., andJordan, T. H. (1991a),Mantle Layering from ScS Reverberations, 1, Waveform Inversion of Zerovi Order Reverberations, J. Geophys. Res.96 (B12), 19,749–19,762.
Revenaugh, J., andJordan, T. H. (1991b),Mantle Layering from ScS Reverberations, 2, The Transition Zone, J. Geophys. Res.96 (B12), 19,763–19,780.
Revenaugh, J., andJordan, T. H. (1991c),Mantle Layering from ScS Reverberations, 3, The Upper Mantle, J. Geophys. Res.96, (B12), 19,781–19,810.
Shearer, P. (1990),Seismic Imaging of Upper Mantle Structure with New Evidence for a 520 Discontinuity, Nature344, 121–126.
Shearer, P. (1991),Constraints on Upper Mantle Discontinuities from Observations of Long Period Reflected and Converted Phases, J. Geophys. Res.96, 18,147–18,182.
Shearer, P., andMasters, T. G. (1992),Global Mapping of Topography on the 660-km Discontinuity, Nature355, 791–796.
Slichter, L. B. (1962),The Theory of the Interpretation of Seismic Travel Time Curves in Horizontal Structures, Physic3, 273–295.
van der Hilst, R. D., Engdahl, R., Sakman, W., andNolet, G. (1991),Tomographic Imaging of Subducted Lithosphere Below Northwest Pacific Island Arcs Nature353, 37–43.
Walck, M. C. (1985),The Upper Mantle Beneath the Northeast Pacific Rim: A Comparison with the Gulf of California, Geophys. J. R. Astr. Soc.81, 243–276.
Walck, M. C., andClayton, R. W. (1984),Analysis of Upper Mantle Structure Using Wavefield Continuation of P Waves, Bull. Seismol. Soc. Am.74, 5,1703–5,1719.
Yoshii, T., andAsano, S. (1972),Time-term Analysis of Explosion Seismic Data, J. Phys. Earth20, 47–57.
Zhao, D., Horiuchi, S., andHasegawa, A. (1992),Seismic Velocity Structure of the Crust Beneath the Japan Islands, Tectonophysics212, 289–301.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Erdoĝan, N., Nowack, R.L. Slant-stack velocity analysis for one-dimensional upper mantle structure using short-period data from MAJO. PAGEOPH 141, 1–24 (1993). https://doi.org/10.1007/BF00876231
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00876231