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CONFIGURATION OF THE ALEUTIAN RIDGE RAT ISLANDS—SEMISOPOCHNOI I TO WEST OF BULDIR I

1953; Geological Society of America; Volume: 64; Issue: 10 Linguagem: Inglês

10.1130/0016-7606(1953)64[1173

1943-2674

WILLIAM M. GIBSON, Haven Nichols,

Paleontology and Stratigraphy of Fossils

Research Article| October 01, 1953 CONFIGURATION OF THE ALEUTIAN RIDGE RAT ISLANDS—SEMISOPOCHNOI I TO WEST OF BULDIR I WILLIAM GIBSON; WILLIAM GIBSON U. S. COAST AND GEODETIC SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar HAVEN NICHOLS HAVEN NICHOLS U. S. COAST AND GEODETIC SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM GIBSON U. S. COAST AND GEODETIC SURVEY, WASHINGTON 25, D. C. HAVEN NICHOLS U. S. COAST AND GEODETIC SURVEY, WASHINGTON 25, D. C. Publisher: Geological Society of America Received: 20 May 1952 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1953, 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 (1953) 64 (10): 1173–1188. https://doi.org/10.1130/0016-7606(1953)64[1173:COTARR]2.0.CO;2 Article history Received: 20 May 1952 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation WILLIAM GIBSON, HAVEN NICHOLS; CONFIGURATION OF THE ALEUTIAN RIDGE RAT ISLANDS—SEMISOPOCHNOI I TO WEST OF BULDIR I. GSA Bulletin 1953;; 64 (10): 1173–1188. doi: https://doi.org/10.1130/0016-7606(1953)64[1173:COTARR]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 The configuration of a 150 by 200 mile section of the Aleutian Ridge, extending from the Aleutian Trench on the south to the floor of the Bering Sea on the north, is presented by means of depth curves at 50-fathom depth intervals.Advances in electronic position indicating had enabled the U. S. Coast and Geodetic Survey to complete accurate and detailed hydrographic surveys of this entire area based on accurate horizontal control. The authors used copies of the large-scale survey sheets for adding 50-fathom depth curves. Compilation on Plate 1 accentuated the submarine topography and gave substance to many interesting configurations that were not evident on the published navigational chart. The scale of Plate 1 is designed for regional coverage. Geologists and others interested in more precise and detailed physiography may refer to the large-scale basic survey sheets of the U. S. Coast and Geodetic Survey.Submarine contours of the Aleutian Trench, a submerged central-cone depression, four sea valleys, and many transverse canyons are shown. Murray Sea valley is completely contained in the study. The Aleutian Ridge is shown to rise in inclined steps from the floors of the Trench and Bering Sea. The Aleutian Bench is a prominent step on the south slope of the Ridge. The volcanic arc is at the north edge of another prominent step on the north slope of the Ridge. Bowie Canyon is a definite submerged line of demarkation between the Aleutian Ridge and Bowers Ridge.Many implications relative to the formation of mountains, island arcs, and trenches may be seen in the configurations. Vertical and horizontal movement may take place along inclined step faults. The step faults and canyonlike transverse faults may outline irregular crustal blocks where differential movement would occur. Great distortion of the bottom occurs along the edges of the sea valleys. Most of the earthquake epicenters may be aligned along inferred step faults by allowing for probable uncertainties in their locations. Definite correlation between earthquakes and submarine topography, if possible, must wait for more accurate epicenter determinations along the Aleutian Ridge. 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.