Coastal uplift associated with the 1992 Cape Mendocino earthquake, northern California

Research Article| March 01, 1994 Coastal uplift associated with the 1992 Cape Mendocino earthquake, northern California G. A. Carver; G. A. Carver 1Humboldt State University, Arcata, California 95521 Search for other works by this author on: GSW Google Scholar A.S. Jayko; A.S. Jayko 2U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar D. W. Valentine; D. W. Valentine 3University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar W. H. Li W. H. Li 4University of Washington, Seattle, Washington 98195 Search for other works by this author on: GSW Google Scholar Author and Article Information G. A. Carver 1Humboldt State University, Arcata, California 95521 A.S. Jayko 2U.S. Geological Survey, Menlo Park, California 94025 D. W. Valentine 3University of California, Santa Barbara, California 93106 W. H. Li 4University of Washington, Seattle, Washington 98195 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (3): 195–198. https://doi.org/10.1130/0091-7613(1994)022<0195:CUAWTC>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 G. A. Carver, A.S. Jayko, D. W. Valentine, W. H. Li; Coastal uplift associated with the 1992 Cape Mendocino earthquake, northern California. Geology 1994;; 22 (3): 195–198. doi: https://doi.org/10.1130/0091-7613(1994)022<0195:CUAWTC>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 The April 25,1992, Cape Mendocino earthquake (Ms 7.1) uplifted ∼24 km of the northern California coast at the southern end of the Cascadia subduction zone, uplift which resulted in coastal emergence that caused extensive mortality of intertidal organisms between Cape Men docino and Punta Gorda. We estimated the amount of uplift by measuring the vertical extent of mortality of 14 sessile intertidal species on rocky sections of shore. The uplift profile along the coast is generally parallel to the strike of the earthquake focal mechanism and forms a broad, flat-topped arch ∼24 km long with a gentle south limb and a steeper north limb. The maximum uplift of 1.4 ±0.2 m is near the center of the profile. The profile is a manifestation of the more widespread domal upwarp produced by slip on an east-dipping buried thrust fault along or near the Cascadia megathrust. Small, new emergent terraces have formed where wave-cut intertidal platforms have been elevated. The new terraces resemble raised late Holocene benches that probably record paleoearthquakes similar to the 1992 event. However, several of the late Holocene terraces are broader and more continuous. These terraces, which extend several tens of kilometres north and south of the 1992 uplift, suggest that some paleoearthquakes were much larger than magnitude 7. 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.