Surface wave tomography for the Barents Sea and surrounding regions
- Part II
Semiannual Technical Summary, Scientific Report, 1-2006, chapter 6.2, NORSAR, Kjeller, Norway, (January 2006)Abstract
A new dataset of surface-wave observations from more than 150 local
and regional events with travel paths through the greater Barents
Sea region was compiled and group-velocity dispersion curves were
measured for Love and Rayleigh waves in the period range 14 - 160
s. (c.f., Part I: Levshin et al., 2005a). This large amount of new
group-velocity measurements was used to enlarge the already existing
data base compiled at the University of Colorado and to increase
the path density in the region under investigation (Levshin et al.,
2001). This combined data set of group-velocity observations was
inverted for 2D group-velocity maps (Barmin et al., 2001; Ritzwoller
et al., 2002; Levshin et al., 2005a). Pasyanos (2005) recently published
another set of group-velocity maps for Eurasia and the European Artic,
which show very similar large scale features in the greater Barents
Sea region but which have far less resolution for smaller scale anomalies
in that area. As mentioned in Levshin et al. (2005a), it was planned
to invert the new group velocity maps for Love and Rayleigh waves
for a new 3D velocity model of the European Arctic.