Blenkinsop, Thomas G. ![]() |
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Abstract
Fractures and microfractures in oriented cores from the Cajon Pass drill hole, southern California, have strong preferred orientations. There are two major sets of extensional fractures and microfractures that have northwest and northeast strikes and vertical dips. Relative and absolute densities of both sets vary greatly within a single core. The regional tectonic history implies that these fractures and microfractures probably formed before late Miocene-Pliocene. Vertical seismic profiling experiments in the drill hole show shear wave splitting with polarization directions parallel to the fracture and microfracture orientations. The measured seismic anisotropy is due to these inherited deformation fabrics and does not appear to be caused by the current local stress field.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Earth and Environmental Sciences |
Subjects: | Q Science > QE Geology |
Additional Information: | Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/2169-9356/ (accessed 20/02/2014). |
Publisher: | American Geophysical Union |
ISSN: | 2169-9356 |
Date of First Compliant Deposit: | 30 March 2016 |
Date of Acceptance: | 21 December 1989 |
Last Modified: | 14 May 2023 21:01 |
URI: | https://orca.cardiff.ac.uk/id/eprint/50641 |
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