Tomographic regionalization of crustal Lg Q in eastern Eurasia | Zendy

Xie J. | Zendy; Wu Z. | Zendy; Liu R. | Zendy; Schaff D. | Zendy; Liu Y. | Zendy; Liang J. | Zendy

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Tomographic regionalization of crustal Lg Q in eastern Eurasia

Author(s) -

Xie J.,

Wu Z.,

Liu R.,

Schaff D.,

Liu Y.,

Liang J.

Publication year - 2006

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2005gl024410

Subject(s) - geology , coda , tectonics , plateau (mathematics) , seismology , maxima , craton , inversion (geology) , geodesy , mathematics , performance art , art , mathematical analysis , art history

We measure Q of crustal Lg waves in eastern Eurasia using the reliable two‐station methods. More than 5,000 spectral ratios are collected over 594 interstation paths, and are used to determine values of Lg Q 0 and η (Q at 1 Hz and its frequency dependence) over these paths. These values are used to derive tomographic models of laterally varying Q 0 and η with resolutions between 4 and 10°. The Q 0 model contains values that vary between 100 and 900. Q 0 are the lowest in the Tibetan plateau, increase to moderate levels towards the east and north, and reach maxima in the Siberian and eastern Europe Cratons. Q 0 values correlate well with regional tectonics. Most η values are between −0.14 and 0.50, with a mean of 0.18. These values are lower than those obtained previously using either an Lg coda Q method, or a method of simultaneous inversion of source spectra and Q.

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