Seismic anisotropy due to preferred mineral orientation observed in shallow crustal rocks in southern Alaska

Research Article| August 01, 1990 Seismic anisotropy due to preferred mineral orientation observed in shallow crustal rocks in southern Alaska Thomas M. Brocher; Thomas M. Brocher 1U.S. Geological Survey, M.S. 977, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Nikolas I. Christensen Nikolas I. Christensen 2Department of Earth & Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907 Search for other works by this author on: GSW Google Scholar Author and Article Information Thomas M. Brocher 1U.S. Geological Survey, M.S. 977, 345 Middlefield Road, Menlo Park, California 94025 Nikolas I. Christensen 2Department of Earth & Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (8): 737–740. https://doi.org/10.1130/0091-7613(1990)018<0737:SADTPM>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Thomas M. Brocher, Nikolas I. Christensen; Seismic anisotropy due to preferred mineral orientation observed in shallow crustal rocks in southern Alaska. Geology 1990;; 18 (8): 737–740. doi: https://doi.org/10.1130/0091-7613(1990)018<0737:SADTPM>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Laboratory velocity measurements and structural field relations explain the observation of a significant seismic anisotropy within highly foliated rocks in southern Alaska. The orientation of the principal compressive stress indicates that this anisotropy is not related to extensive dilatancy, but can be satisfactorily explained by the foliation of the metasedimentary rocks. Laboratory measurements indicate a significant anisotropy within these rocks even at pressures well above those thought to close microcracks. These observations document that anisotropy related to preferred mineral orientation may be widespread in continental rocks. Thus, pervasive foliation can play a more important role in causing anisotropy than dilatancy, and inferences of principal stress orientations solely from anisotropy may be erroneous. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.