EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Goldberg & Yin 1994
Goldberg, D. and Yin, C.-S. (1994). Attenuation of P-waves in oceanic crust: Multiple scattering from observed heterogeneities. Geophysical Research Letters 21: doi: 10.1029/94GL01855. issn: 0094-8276.

We extend a model for seismic attenuation that includes scattering and intrinsic components, Q-1=Q-1s+Q-1i, over five decades in experimental wavelength. Core images and downhole logs from Ocean Drilling Program Hole 735B near the Atlantis II Fracture Zone in the Indian Ocean were used to construct vertical profiles of heterogeneity and to compute a spectrum of Q-1s using a multiple scattering model. Measurements of velocity dispersion suggest that Q-1i is small compared to the measured attenuation Q-1. Measurements of Q-1 made at this site by laboratory, sonic log and VSP experiments are compared to the computed Q-1s spectrum. Peaks in the Q-1s spectrum occur at six major correlation lengths scales (0.006 m, 0.02 m, 0.16 m, 0.63 m, 8.0 m, and 25.0 m) which can be attributed to formation heterogeneity. Compared to typical seismic estimates of Q-1 in oceanic Layer 3, the measurements in Hole 735B are high, but can be explained by large Q-1s values in shallow, fractured ocean crust. Based on this comparison, we conclude that the proximity of the experimental wavelength in band-limited studies to the length scale of heterogeneity is critical in the measurement of Q-1. ¿ American Geophysical Union 1994

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Structure of the crust, Physical Properties of Rocks, Wave attenuation, Marine Geology and Geophysics, Marine seismics
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit