Seismic focusing by a single planar fracture

Details Seismic focusing by a single planar fracture Seismic focusing by a single planar fracture

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e...7o&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 7-1, CiteID 1203, DOI 10.1029/2002GL016264

Mathematics

Logic

1

Physical Properties Of Rocks: Wave Attenuation, Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Instruments And Techniques, Physical Properties Of Rocks: General Or Miscellaneous

Scientific paper

A single plane fracture with an axially symmetric stress distribution behaves as a seismic lens that focuses seismic energy to a beam ``waist'' at a focal plane. Both phase and amplitude effects on a seismic wave propagating across the fracture contribute to the lensing behavior. Radial gradients in the fracture specific stiffness cause wave refraction through a radially varying group time delay, while the fracture transmission amplitude approximates a Fresnel zone plate. This work demonstrates that a two-dimensional planar fracture, contrasted with three-dimensional geologic structures such as basins and domes, can focus seismic waves. Focusing of seismic waves by fractures should be considered in the interpretation of seismic data from fractured strata with heterogeneous stress distributions.

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