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Research Article| December 01, 2006 A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galápagos William W. Chadwick, Jr.; William W. Chadwick, Jr. 1Oregon State University–National Oceanographic and Atmospheric Administration, 2115 SE OSU Drive, Newport, Oregon 97365, USA Search for other works by this author on: GSW Google Scholar Dennis J. Geist; Dennis J. Geist 2Geological Sciences, University of Idaho, Moscow, Idaho 83844, USA Search for other works by this author on: GSW Google Scholar Sigurjón Jónsson; Sigurjón Jónsson 3Institute of Geophysics, ETH Zürich, Schafmattstrasse 30, 8093 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Michael Poland; Michael Poland 4Hawaii Volcano Observatory, U.S. Geological Survey, P.O. Box 51, Hawaii National Park, Hawaii 96718, USA Search for other works by this author on: GSW Google Scholar Daniel J. Johnson; Daniel J. Johnson 5Department of Geology, University of Puget Sound, Tacoma, Washington 98416, USA Search for other works by this author on: GSW Google Scholar Charles M. Meertens Charles M. Meertens 6UNAVCO, 6350 Nautilus Drive, Boulder, Colorado 80301, USA Search for other works by this author on: GSW Google Scholar Author and Article Information William W. Chadwick, Jr. 1Oregon State University–National Oceanographic and Atmospheric Administration, 2115 SE OSU Drive, Newport, Oregon 97365, USA Dennis J. Geist 2Geological Sciences, University of Idaho, Moscow, Idaho 83844, USA Sigurjón Jónsson 3Institute of Geophysics, ETH Zürich, Schafmattstrasse 30, 8093 Zürich, Switzerland Michael Poland 4Hawaii Volcano Observatory, U.S. Geological Survey, P.O. Box 51, Hawaii National Park, Hawaii 96718, USA Daniel J. Johnson 5Department of Geology, University of Puget Sound, Tacoma, Washington 98416, USA Charles M. Meertens 6UNAVCO, 6350 Nautilus Drive, Boulder, Colorado 80301, USA Publisher: Geological Society of America Received: 21 Mar 2006 Revision Received: 20 Jun 2006 Accepted: 26 Jun 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2006) 34 (12): 1025–1028. https://doi.org/10.1130/G22826A.1 Article history Received: 21 Mar 2006 Revision Received: 20 Jun 2006 Accepted: 26 Jun 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation William W. Chadwick, Dennis J. Geist, Sigurjón Jónsson, Michael Poland, Daniel J. Johnson, Charles M. Meertens; A volcano bursting at the seams: Inflation, faulting, and eruption at Sierra Negra volcano, Galápagos. Geology 2006;; 34 (12): 1025–1028. doi: https://doi.org/10.1130/G22826A.1 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 results of geodetic monitoring since 2002 at Sierra Negra volcano in the Galápagos Islands show that the filling and pressurization of an ∼2-km-deep sill eventually led to an eruption that began on 22 October 2005. Continuous global positioning system (CGPS) monitoring measured >2 m of accelerating inflation leading up to the eruption and contributed to nearly 5 m of total uplift since 1992, the largest precursory inflation ever recorded at a basaltic caldera. This extraordinary uplift was accommodated in part by repeated trapdoor faulting, and coseismic CGPS data provide strong constraints for improved deformation models. These results highlight the feedbacks between inflation, faulting, and eruption at a basaltic volcano, and demonstrate that faulting above an intruding magma body can relieve accumulated strain and effectively postpone eruption. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.