Anomalous Gravity Field in East-Central California

Research Article| October 01, 1963 ANOMALOUS GRAVITY FIELD IN EAST-CENTRAL CALIFORNIA HOWARD W OLIVER; HOWARD W OLIVER U. S. GEOLOGICAL SURVEY, MENLO PARK, CALIF. Search for other works by this author on: GSW Google Scholar DON R MABEY DON R MABEY PUBLICATION AUTHORIZED BY THE DIRECTOR, U. S. GEOLOGICAL SURVEY Search for other works by this author on: GSW Google Scholar Author and Article Information HOWARD W OLIVER U. S. GEOLOGICAL SURVEY, MENLO PARK, CALIF. DON R MABEY PUBLICATION AUTHORIZED BY THE DIRECTOR, U. S. GEOLOGICAL SURVEY Publisher: Geological Society of America Received: 02 Apr 1963 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1963, 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 (1963) 74 (10): 1293–1298. https://doi.org/10.1130/0016-7606(1963)74[1293:AGFIEC]2.0.CO;2 Article history Received: 02 Apr 1963 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation HOWARD W OLIVER, DON R MABEY; ANOMALOUS GRAVITY FIELD IN EAST-CENTRAL CALIFORNIA. GSA Bulletin 1963;; 74 (10): 1293–1298. doi: https://doi.org/10.1130/0016-7606(1963)74[1293:AGFIEC]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 Bouguer gravity values at about 11,000 stations in east-central California range from −14 mgal near Merced to −274 mgal in Long Valley. Gravity lows in the west and south parts of the San Joaquin Valley and over local basins south and east of the Sierra Nevada are produced by large thicknesses of Upper Cretaceous and Cenozoic deposits. A large regional gravity low over the Sierra Nevada can be explained by isostatic compensation of the range together with the effect of the relatively low-density rocks of the Sierra Nevada batholith.A broad gravity ridge along the east side of the San Joaquin Valley shows excellent correlation with a similar magnetic ridge where the two sets of data are available, suggesting that both anomalies are caused by a dense, magnetic mass buried at an estimated depth of 5–10 miles. Seismic refraction measurements further indicate that the thickness of the earth's crust under the valley is less than 12 miles. Thus, the anomalous mass is in the lower part of the earth's crust and is conceivably related to the more mafic rocks of the earth's upper mantle. 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.