Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120604i&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 20, CiteID L20604
Physics
1
Physical Properties Of Rocks: Wave Attenuation, Seismology: Body Wave Propagation, Seismology: Continental Crust (1242), Structural Geology: Local Crustal Structure
Scientific paper
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 ω2 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.
Horiuchi Shigeki
Iio Yoshihisa
Ito Hisao
Ito Shinobu
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