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Middle America Trench: Seismic-Refraction Studies

1961; Geological Society of America; Volume: 72; Issue: 5 Linguagem: Inglês

10.1130/0016-7606(1961)72[721

1943-2674

George G. Shor, Robert L. Fisher,

earthquake and tectonic studies

Research Article| May 01, 1961 Middle America Trench: Seismic-Refraction Studies GEORGE G SHOR, JR.; GEORGE G SHOR, JR. University of California, The Scripps Institution of Oceanography, La Jolla, Calif Search for other works by this author on: GSW Google Scholar ROBERT L FISHER ROBERT L FISHER University of California, The Scripps Institution of Oceanography, La Jolla, Calif Search for other works by this author on: GSW Google Scholar Author and Article Information GEORGE G SHOR, JR. University of California, The Scripps Institution of Oceanography, La Jolla, Calif ROBERT L FISHER University of California, The Scripps Institution of Oceanography, La Jolla, Calif Publisher: Geological Society of America Received: 25 Feb 1959 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1961, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1961) 72 (5): 721–729. https://doi.org/10.1130/0016-7606(1961)72[721:MATSS]2.0.CO;2 Article history Received: 25 Feb 1959 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation GEORGE G SHOR, ROBERT L FISHER; Middle America Trench: Seismic-Refraction Studies. GSA Bulletin 1961;; 72 (5): 721–729. doi: https://doi.org/10.1130/0016-7606(1961)72[721:MATSS]2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract Seismic-refraction profiles in the Middle America Trench show that the main crustal layer ranges from normal oceanic thickness (about 5 km) t o half again as thick. Sediments are thicker than in the Pacific Basin. Because of the increased depth of water and sediment at all stations and thickening of the main crustal layer at some stations, the M discontinuity bows down beneath the trench. At the outer edge of the continental shelf near Guatemala, the water is replaced by sediments and rocks which may be either consolidated sediments or volcanic rocks; the M discontinuity is at little greater depth than beneath the trench. This content is PDF only. Please click on the PDF icon to access. 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.