Frequency dependence of Q for seismic body waves in the Earth's mantle
Item
Title (Dublin Core)
en-US
Frequency dependence of Q for seismic body waves in the Earth's mantle
Description (Dublin Core)
en-US
In this paper an attempt is made to determine the frequency dependence of Q in the Earth's mantle in the frequency range 0.03–1.5 Hz from the spectral ratio of teleseismic S- and P-waves. Digital broad-band data of 17 earthquakes at 40° < ∆ < 90° recorded at the Central Seismological Observatory of the Federal Republic of Germany at Erlangen were analysed. The method implies the following assumptions: frequency independence of the crustal transfer function, proportionality of Qp (f) and Qs (f), and proportionality of P- and S-source spectra. This last and most critical assumption was carefully investigated by kinematic and dynamic source models. The calculated Q-spectra for the individual events vary considerably but all have in common a general increasing trend with frequency which can best be represented by a power law Q ≈ f α with 0.25 < α < 0.6. A further increase in slope near 1 Hz suggests an absorption band corner with an upper cut-off relaxation time τm = 0.33 ± 0.18 s. The significance of the Q-spectra and their variability is estimated by manipulating semi-synthetic seismograms with different error-producing processes such as length and shape of the time window, superposition of noise, digital filter process and source spectra. It is concluded that none of these processes is able to destroy or to imitate the observed increasing trend of Q with frequency. The results are compared with those from other seismological investigations and from laboratory experiments on mantle rocks at high temperature and in the seismic frequency band.
ARK: https://n2t.net/ark:/88439/y081538
Permalink: https://geophysicsjournal.com/article/270
ARK: https://n2t.net/ark:/88439/y081538
Permalink: https://geophysicsjournal.com/article/270
Creator (Dublin Core)
Ulug, A.
Berckhemer, H.
Subject (Dublin Core)
en-US
Anelastic wave attenuation in the Earth's mantle
en-US
Frequency dependence of Q
en-US
Spectral ratio method
en-US
Solid Earth
Publisher (Dublin Core)
en-US
Journal of Geophysics
Date (Dublin Core)
1984-12-13
Type (Dublin Core)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
en-US
Peer-reviewed Article
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/270
Source (Dublin Core)
en-US
Journal of Geophysics; Vol 56 No 1 (1985): Journal of Geophysics; 9-19
2643-2986
2643-9271
Language (Dublin Core)
eng
Relation (Dublin Core)
https://journal.geophysicsjournal.com/JofG/article/view/270/228