Attenuation of broad-band (50-1500 Hz) seismic waves in granitic rocks near the Earth' surface
Details
Serval ID
serval:BIB_9508FD622C80
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Attenuation of broad-band (50-1500 Hz) seismic waves in granitic rocks near the Earth' surface
Journal
Geophysical Research Letters
ISSN-L
0094-8276
Publication state
Published
Issued date
1996
Peer-reviewed
Oui
Volume
23
Pages
1981-1984
Language
english
Abstract
We report Q-estimates from borehole-to-tunnel seismic experiments
at Nagra's ''Grimsel Test Site'' (GTS). The probed granitic rocks
are cut by brittle faults but do not show any signs of pervasive
weathering. Q-values estimated from P-wave first arrivals by the
spectral ratio and rise time methods range from about 20 to 60 with
a median value of 35 and a standard error of 20% or less. The surprisingly
low Q-values inferred indicate that even outside the weathering zone,
seismic attenuation in some parts of the uppermost crystalline crust
may be very high.
at Nagra's ''Grimsel Test Site'' (GTS). The probed granitic rocks
are cut by brittle faults but do not show any signs of pervasive
weathering. Q-values estimated from P-wave first arrivals by the
spectral ratio and rise time methods range from about 20 to 60 with
a median value of 35 and a standard error of 20% or less. The surprisingly
low Q-values inferred indicate that even outside the weathering zone,
seismic attenuation in some parts of the uppermost crystalline crust
may be very high.
Create date
25/11/2013 19:28
Last modification date
20/08/2019 15:57