Experiments on the indentation process during cryptodome intrusions: New insights into Mount St. Helens deformation

Abstract

Research Article| January 01, 1998 Experiments on the indentation process during cryptodome intrusions: New insights into Mount St. Helens deformation Franck Donnadieu; Franck Donnadieu 1Universiteé Blaise Pascal, Centre de Recherches Volcanologiques, UMR 6524-CNRS, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Olivier Merle Olivier Merle 1Universiteé Blaise Pascal, Centre de Recherches Volcanologiques, UMR 6524-CNRS, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information Franck Donnadieu 1Universiteé Blaise Pascal, Centre de Recherches Volcanologiques, UMR 6524-CNRS, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Olivier Merle 1Universiteé Blaise Pascal, Centre de Recherches Volcanologiques, UMR 6524-CNRS, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France 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 (1): 79–82. https://doi.org/10.1130/0091-7613(1998)026<0079:EOTIPD>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 Franck Donnadieu, Olivier Merle; Experiments on the indentation process during cryptodome intrusions: New insights into Mount St. Helens deformation. Geology 1998;; 26 (1): 79–82. doi: https://doi.org/10.1130/0091-7613(1998)026<0079:EOTIPD>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 Scaled experiments were carried out to study the deformation of a volcanic edifice by forcible intrusion of a cryptodome. As the magma analogue is injected vertically into a sand cone, asymmetric deformation is caused by the formation of a curved major shear fault, which dips inward from one side of the cone to the opposite edge of the intrusion. The path of the ascending silicone deviates to follow the trajectory of the fault, and a lateral bulge grows slowly from the footwall of the fault. The oblique push makes the bulge migrate outward, causing extension upslope to form an asymmetric graben in the hanging wall of the major shear fault. We suggest that the pattern of internal deformation within Mount St. Helens prior to the May 18, 1980, eruption was similar to that observed in our scaled models. 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.