Unbekannt
In:
Geophys. Res. Lett., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 31,
no. 20, pp. 1-5, pp. L20604, (ISSN 0016-8548, ISBN 3-510-50045-8)
Publikationsdatum:
2004
Beschreibung:
Seismic attenuation parameters three borehole stations in Western Nagano,
Central Japan. Based on the difference in attenuation between combinations of two
boreholes, the local attenuation (Qp**-1) is 1.23*10**-3 s in the frequency range of 80
to 250 Hz. Obtained Qp**-1 is consistent with the trend estimated by grid search with
the assumption of the omega**2 source model. Even though the boreholes are located on
the fracture area of the 1984 Nagano-Ken-Seibu Earthquake, the estimated Qp**-1 is low.
The result is not completely consistent with a previous study, and a result of Qs**-1
obtained from the twofold spectral ratio, but the difference can be interpreted as the
difference of frequency ranges. The differences of station corrections of attenuation
between boreholes are much smaller than the difference between borehole and surface, and
the result shows the advantage of borehole seismometers.
Schlagwort(e):
Attenuation
;
Quality factor
;
Borehole geophys.
;
P-waves
;
Spectrum
;
5144
;
Physical
;
Properties
;
of
;
Rocks:
;
Wave
;
attenuation
;
GRL
;
7203
;
Seismology:
;
Body
;
wave
;
propagation
;
7205
;
Continental
;
crust
;
8015
;
Structural
;
Geology:
;
Local
;
crustal
;
structure
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