Research Article| October 01, 1977 Surface faulting associated with the 5.2 magnitude Galway Lake earthquake of May 31, 1975: Mojave Desert, San Bernardino County, California ROBERT L. HILL; ROBERT L. HILL 1California Division of Mines and Geology, Los Angeles, California 90012 Search for other works by this author on: GSW Google Scholar DAVID J. BEEBY DAVID J. BEEBY 1California Division of Mines and Geology, Los Angeles, California 90012 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1977) 88 (10): 1378–1384. https://doi.org/10.1130/0016-7606(1977)88<1378:SFAWTM>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ROBERT L. HILL, DAVID J. BEEBY; Surface faulting associated with the 5.2 magnitude Galway Lake earthquake of May 31, 1975: Mojave Desert, San Bernardino County, California. GSA Bulletin 1977;; 88 (10): 1378–1384. doi: https://doi.org/10.1130/0016-7606(1977)88<1378:SFAWTM>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 An earthquake of magnitude 5.2 occurred on May 31, 1975, near Galway Lake in the Mojave Desert, San Bernardino County, California. Preliminary information from the Seismological Laboratory at the California Institute of Technology placed the hypo-center at a depth of 5.8 km with the epicenter at lat 34°31.4′N and long 116°29.3′W. This event was accompanied by surface rupture in a zone 6.8 km long and as much as 100 m wide, trending N25°W to due north along an existing but unmapped fault. Field evidence and aftershock data by others indicate that the fault is vertical. Left-stepping en echelon fractures indicate predominant right-lateral displacement. Individual fractures are vertical and have right slip generally from 0.2 to 0.5 cm up to a maximum of 1.5 cm. Shallow pits dug across surface faults in Quaternary alluvium revealed plant roots concentrated in fractures indicating that surface rupture occurred along these fractures during at least one previous event. These and other features combined with topographic evidence confirm previous Quaternary displacement and may indicate at least one previous event accompanied by surface rutpure in Holocene time. This rupture zone has been named the Galway Lake fault zone. 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.
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Hill et al. (1977) studied this question.