Abstract

Research Article| May 01, 1998 Effect of subducting sea-floor roughness on fore-arc kinematics, Pacific coast, Costa Rica Donald M. Fisher; Donald M. Fisher 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Search for other works by this author on: GSW Google Scholar Thomas W. Gardner; Thomas W. Gardner 2Department of Geosciences, Trinity University, San Antonio, Texas 78212 Search for other works by this author on: GSW Google Scholar Jeffrey S. Marshall; Jeffrey S. Marshall 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Search for other works by this author on: GSW Google Scholar Peter B. Sak; Peter B. Sak 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Search for other works by this author on: GSW Google Scholar Marino Protti Marino Protti 3Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional, Apartado 86-3000, Heredia, Costa Rica Search for other works by this author on: GSW Google Scholar Author and Article Information Donald M. Fisher 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Thomas W. Gardner 2Department of Geosciences, Trinity University, San Antonio, Texas 78212 Jeffrey S. Marshall 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Peter B. Sak 1Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania 16802 Marino Protti 3Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional, Apartado 86-3000, Heredia, Costa Rica Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (5): 467–470. https://doi.org/10.1130/0091-7613(1998)026<0467:EOSSFR>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Donald M. Fisher, Thomas W. Gardner, Jeffrey S. Marshall, Peter B. Sak, Marino Protti; Effect of subducting sea-floor roughness on fore-arc kinematics, Pacific coast, Costa Rica. Geology 1998;; 26 (5): 467–470. doi: https://doi.org/10.1130/0091-7613(1998)026<0467:EOSSFR>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 Fault kinematics and uplift in the Costa Rican fore arc of the Middle America convergent margin are controlled to a large extent by roughness on the subducting Cocos plate. Along the northwest flank of the incoming Cocos Ridge, seafloor is characterized by short wavelength roughness related to northeast-trending seamount chains. Onland projection of the rough subducting crust coincides with a system of active faults oriented at high angles to the margin that segment the fore-arc thrust belt and separate blocks with contrasting uplift rates. Trunk segments of Pacific slope fluvial systems typically follow these margin-perpendicular faults. Regionally developed marine and fluvial terraces are correlated between drainages and across faults along the Costa Rican Pacific coast. Terrace separations across block-bounding faults reveal a pattern of fore-arc uplift that coincides roughly with the distribution of incoming seamounts. Magnitude and distribution of Quaternary uplift along the Costa Rican Pacific coast suggests that, despite a thin incoming sediment pile, the inner fore arc shows an accumulation of mass—a characteristic that may be due to underplating of seamounts beneath the fore-arc high. 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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