IN SITU SEISMIC MEASUREMENTS OF CRACK ANISOTROPY IN THE CARBONIFEROUS LIMESTONE OF NORTHWEST ENGLAND*
Authors:
- 1 June 1979
- journal article
- Published by Wiley in Geophysical Prospecting
- Vol. 27 (2) , 322-338
Abstract
Seismic velocity anisotropy is predicted for cracked rocks containing either a naturally‐occurring or an artificially‐induced preferred orientation of cracks. Methods developed for the study of velocity anisotropy in the uppermost mantle have been applied to the in situ measurement of P‐wave velocity anisotropy in fractured Carboniferous Limestone in Northwest England. At three different sites, first‐arrival travel‐time data has been obtained using conventional refraction equipment and a weight‐drop source. Velocity anisotropy of 15–29% is identified with directions of maximum and minimum velocities that can be broadly related to previously mapped orientations of joints.Keywords
This publication has 12 references indexed in Scilit:
- Seismic anisotropy?the state of the artGeophysical Journal International, 1977
- Inversion of P-wave velocity anisotropyGeophysical Journal International, 1977
- Pnvelocity anisotropy in a continental upper mantleGeophysical Journal International, 1977
- A review of the effects of anisotropic layering on the propagation of seismic wavesGeophysical Journal International, 1977
- The effect of oriented cracks on seismic velocitiesJournal of Geophysical Research, 1974
- An Example of the Iterative Approach to Time-Term AnalysisGeophysical Journal International, 1973
- A tectonic history of northwest EnglandJournal of the Geological Society, 1972
- Effects of stress on velocity anisotropy in rocks with cracksJournal of Geophysical Research, 1971
- CARBONIFEROUS JOINTS IN THE NORTH OF ENGLAND AND THEIR RELATION TO EARLIER AND LATER STRUCTURESProceedings of the Yorkshire Geological and Polytechnic Society, 1967
- THE PLUS‐MINUS METHOD OF INTERPRETING SEISMIC REFRACTION SECTIONS*Geophysical Prospecting, 1959