scholarly journals Velocity variations in the crust and upper mantle beneath the Tien Shan inferred from Rayleigh wave dispersion: Implications for tectonic and dynamic processes

1998 ◽  
Vol 103 (B2) ◽  
pp. 2693-2703 ◽  
Author(s):  
Hanan Mahdi ◽  
Gary L. Pavlis
Keyword(s):  
Rayleigh Wave ◽  
Upper Mantle ◽  
Wave Dispersion ◽  
Tien Shan ◽  
Dynamic Processes ◽  
Crust And Upper Mantle ◽  
Velocity Variations ◽  
Rayleigh Wave Dispersion

Bulk Structure of the Crust and Upper Mantle beneath Alaska from an Approximate Rayleigh-Wave Dispersion Formula

2020 ◽  
Vol 91 (6) ◽  
pp. 3064-3075
Author(s):  
Matthew M. Haney ◽  
Kevin M. Ward ◽  
Victor C. Tsai ◽  
Brandon Schmandt
Keyword(s):  
Rayleigh Wave ◽  
Shear Wave ◽  
Upper Mantle ◽  
Wave Dispersion ◽  
Crustal Thickness ◽  
Crust And Upper Mantle ◽  
First Order ◽  
Wave Phase ◽  
Dispersion Formula ◽  
Rayleigh Wave Dispersion

Abstract We introduce a method for estimating crustal thickness and bulk crustal and upper-mantle shear-wave velocities directly from high-quality measurements of fundamental-mode Rayleigh-wave dispersion in the period range from 10 to 40 s. The method is based on an approximate Rayleigh-wave dispersion formula and provides fast results with minimal model parameterization. We apply the method to Rayleigh-wave phase maps in Alaska to reveal first-order structure in a region that had not been systematically and densely instrumented prior to the Transportable Array (TA). To demonstrate the consistency of the results, we also apply the same method to existing Rayleigh-wave phase maps derived from TA data in the conterminous United States, where crustal and upper mantle structures are better known. We contrast features observed in maps of crustal thickness and bulk shear-wave velocity between the Cascadia and Alaska-Aleutian subduction zones to highlight differences in the two regions. Our results show that, contrary to conventional wisdom, first-order information on the location of major depth discontinuities (e.g., the Moho) can be extracted in a fast, straightforward manner from measurements of Rayleigh-wave dispersion alone.

scholarly journals Upper mantle S velocities beneath Afar and Western Saudi Arabia from Rayleigh wave dispersion

1998 ◽  
Vol 25 (22) ◽  
pp. 4233-4236 ◽  
Author(s):  
Ronald P. Knox ◽  
Andrew A. Nyblade ◽  
Charles A. Langston
Keyword(s):  
Saudi Arabia ◽  
Rayleigh Wave ◽  
Upper Mantle ◽  
Wave Dispersion ◽  
Rayleigh Wave Dispersion

A crust and upper mantle model for Novaya Zemlya from Rayleigh-wave dispersion data

1978 ◽  
Vol 68 (6) ◽  
pp. 1651-1662
Author(s):  
Douglas W. McCowan ◽  
Peter Glover ◽  
Shelton S. Alexander
Keyword(s):  
Phase Velocity ◽  
Rayleigh Wave ◽  
Shear Wave ◽  
Upper Mantle ◽  
Wave Dispersion ◽  
Surface Wave Dispersion ◽  
Crust And Upper Mantle ◽  
Novaya Zemlya ◽  
Phase Velocity Dispersion ◽  
Single Station

abstract We derive a shear-wave crust and upper mantle structure for the southern part of Novaya Zemlya by an application of the two-event, single-station method of Rayleigh-wave phase-velocity dispersion analysis. This method provides a means of isolating the surface-wave dispersion characteristics of a remote source region using only teleseismic recordings. The observed phase-velocity data are then systematically inverted to obtain a best-fitting model. Our preferred model has a 45-km thick crust with no shear-wave low-velocity zone in the upper mantle. It is similar to published structures for the southern Ural mountains and is therefore compatible with the premise that Novaya Zemlya is a nothern extension of the Urals.

Sign in / Sign up

Export Citation Format

Share Document