The validity of Q estimates from borehole data using spectral ratios

Online Access: Get full text
doi: 10.1190/1.1442776
Author(s): Sams, Mark; Goldberg, David
Author Affiliation(s): Primary:
Imp. Coll., Dep. Geol., London, United Kingdom
Lamont-Doherty Geol. Obs., United States
Volume Title: Geophysics
Source: Geophysics, 55(1), p.97-101. Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States. ISSN: 0016-8033 CODEN: GPYSA7
Note: In English. 14 refs.; illus. incl. 2 tables
Summary: The measurement from borehole sonic data of Q, the acoustic attenuation coefficient of an earth section, can be achieved in three ways: forward modeling (Chuen and Toksöz, 1981), spectral ratios (Gladwin and Stacey, 1974), and inversion (Cheng et al., 1986). The spectral-ratio technique has been applied to real data (Goldberg et al., 1985) but is unstable and not very reliable. Experiments have shown that the spectral-ratio technique applied to waveforms gives Q estimates which are lower than those measured from cores in the laboratory (Goldberg and Zinszner, 1989). We investigate this phenomenon using synthetic and real data.
Year of Publication: 1990
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 20 Geophysics, Applied; Acoustical methods; Atlantic Ocean; Attenuation; Body waves; Boreholes; DSDP Site 418; Data processing; Deep Sea Drilling Project; Direct problem; Elastic waves; Errors; Filters; Fourier analysis; Geophysical methods; IPOD; Inverse problem; Leg 102; Leg 52; Leg 53; Ocean Drilling Program; P-waves; Q; Seismic waves; Spectral analysis; Velocity; Waveforms
Coordinates: N250205 N250207 W0680326 W0680327
Record ID: 1989081247
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States