CaltechAUTHORS
  A Caltech Library Service

Phase velocities of long-period surface waves and structure of the upper mantle: 1. Great-Circle Love and Rayleigh wave data

Toksöz, M. Nafi and Anderson, Don L. (1966) Phase velocities of long-period surface waves and structure of the upper mantle: 1. Great-Circle Love and Rayleigh wave data. Journal of Geophysical Research, 71 (6). pp. 1649-1658. ISSN 0148-0227. http://resolver.caltech.edu/CaltechAUTHORS:20140513-104312696

[img]
Preview
PDF - Published Version
See Usage Policy.

595Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20140513-104312696

Abstract

New long-period dispersion data are obtained from the surface waves generated by the Alaska earthquake of March 28, 1964, and recorded at Isabella, Kipapa, and Stuttgart. Digital techniques were used to isolate phases and determine spectrums over the period band 80 to 670 seconds. Available phase velocity data are now accurate enough to permit us to discuss regional variations which can be attributed to heterogeneity of the upper 400 km of the mantle. Average phase velocities are markedly affected by the character of the continental fraction of the path. Shield areas raise the average phase velocity; tectonic and mountainous areas have the opposite effect. The tectonic-shield distinction is as important as the more obvious continental-oceanic distinction. An average mantle structure, designated CIT 12, is determined for the Mongolia-Pasadena composite great-circle path. The major features of this new mantle model are similar to those determined for the New Guinea-Pasadena great-circle path (model CIT 11), namely, a pronounced and deep low-velocity zone and two discontinuities in the upper mantle at depths near 350 km and 700 km. The two models differ in a way that suggests lower average shear velocities under tectonic regions than under shield areas to depths of the order of 400 km.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://onlinelibrary.wiley.com/doi/10.1029/JZ071i006p01649/abstractPublisherArticle
http://dx.doi.org/10.1029/JZ071i006p01649DOIArticle
Additional Information:© 1966 American Geophysical Union. Manuscript received September 1, 1965; revised December 7, 1965. S. S. Alexander, W. Pilant, and L. Alsop kindly furnished us with copies of their computer programs. This research was supported by the Advanced Research Projects Agency and monitored by the Air Force Office of Scientific Research under contract AF-49(638)-1337. Contribution 1359, Division of Geological Sciences, California Institute of Technology, Pasadena.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences1359
Record Number:CaltechAUTHORS:20140513-104312696
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140513-104312696
Official Citation:Toksöz, M. N., and D. L. Anderson (1966), Phase velocities of long-period surface waves and structure of the upper mantle: 1. Great-Circle Love and Rayleigh wave data, J. Geophys. Res., 71(6), 1649–1658, doi:10.1029/JZ071i006p01649.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45717
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 May 2014 18:02
Last Modified:13 Feb 2019 18:04

Repository Staff Only: item control page