Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1124
AuthorsCarannante, S.* 
Boschi, L.* 
TitleDatabases of surface wave dispersion
Issue DateDec-2005
Series/Report no.48 (6)
URIhttp://hdl.handle.net/2122/1124
http://hdl.handle.net/2122/1124
Keywordsseismic tomography
upper mantle
lateral resolution
azimuthal anisotropy
Subject Classification04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
AbstractObservations of seismic surface waves provide the most important constraint on the elastic properties of the Earth’s lithosphere and upper mantle. Two databases of fundamental mode surface wave dispersion were recently compiled and published by groups at Harvard (Ekström et al., 1997) and Utrecht/Oxford (Trampert and Woodhouse, 1995, 2001), and later employed in 3-d global tomographic studies. Although based on similar sets of seismic records, the two databases show some significant discrepancies. We derive phase velocity maps from both, and compare them to quantify the discrepancies and assess the relative quality of the data; in this endeavour, we take careful account of the effects of regularization and parametrization. At short periods, where Love waves are mostly sensitive to crustal structure and thickness, we refer our comparison to a map of the Earth’s crust derived from independent data. On the assumption that second-order effects like seismic anisotropy and scattering can be neglected, we find the measurements of Ekström et al. (1997) of better quality; those of Trampert and Woodhouse (2001) result in phase velocity maps of much higher spatial frequency and, accordingly, more difficult to explain and justify geophysically. The discrepancy is partly explained by the more conservative a priori selection of data implemented by Ekström et al. (1997). Nevertheless, it becomes more significant with decreasing period, which indicates that it could also be traced to the different measurement techniques employed by the authors.
Appears in Collections:Annals of Geophysics

Files in This Item:
File Description SizeFormat 
07 Carannante.pdf7.4 MBAdobe PDFView/Open
Show full item record

Page view(s)

109
Last Week
0
Last month
1
checked on Jul 26, 2017

Download(s)

796
checked on Jul 26, 2017

Google ScholarTM

Check