High-resolution Rayleigh wave slowness tomography of central Asia

Mónica Maceira, Steven R. Taylor, Charles James Ammon, Xiaoning Yang, Aaron A. Velasco

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We compute short-period, high-resolution Surface wave slowness maps for central Asia using Bayesian tomography. We focus on the region between 69° and 108° and 29° and 54°N and used seismograms from more than 1100 events. Using multiple-filter and phase-matched filter techniques, we measured the dispersion characteristics of the signals between 6 and 30 s period. These Rayleigh wave group velocity dispersion curves were used to compute high-resolution, half-degree cell size, slowness tomographic maps. Because short periods are primarily sensitive to upper crustal structures, the images display low velocities associated with the Tarim, Junggar, and Qaidam basins. Relatively high velocities are associated with mountainous tectonic features such as the Tian Shan. We validated our maps using dispersion curves from 640 events that were not used to construct the tomographic model. The model predictions show a significant variance reduction at short and intermediate periods (6-15 s) with respect to the prior model. Our model also shows 15% improvement in surface wave detection capability with respect to previous one-dimensional models. These high-resolution, short-period tomography maps can help improve regional magnitude estimations for construction of mb:Ms discriminants. Moreover, the short-period surface wave tomographic results show unprecedented resolution that reveals greater geologic detail than has previously been achieved using surface waves and that give us insight into the shear velocity structure of the crust underlying this part of Asia.

Original languageEnglish (US)
Article numberB06304
Pages (from-to)1-15
Number of pages15
JournalJournal of Geophysical Research: Solid Earth
Volume110
Issue number6
DOIs
StatePublished - Jun 4 2005

Fingerprint

Rayleigh waves
Rayleigh wave
tomography
Tomography
Surface waves
surface wave
surface waves
high resolution
Group velocity dispersion
filter
wave group
matched filters
tectonic feature
Matched filters
seismograms
curves
Tectonics
seismogram
crustal structure
velocity structure

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Maceira, Mónica ; Taylor, Steven R. ; Ammon, Charles James ; Yang, Xiaoning ; Velasco, Aaron A. / High-resolution Rayleigh wave slowness tomography of central Asia. In: Journal of Geophysical Research: Solid Earth. 2005 ; Vol. 110, No. 6. pp. 1-15.
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High-resolution Rayleigh wave slowness tomography of central Asia. / Maceira, Mónica; Taylor, Steven R.; Ammon, Charles James; Yang, Xiaoning; Velasco, Aaron A.

In: Journal of Geophysical Research: Solid Earth, Vol. 110, No. 6, B06304, 04.06.2005, p. 1-15.

Research output: Contribution to journalArticle

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