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Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes

2018; Geological Society of America; Volume: 47; Issue: 1 Linguagem: Inglês

10.1130/g45323.1

1943-2682

Atsuko Namiki, Eleonora Rivalta, Heiko Woith, Timothy Willey, Stefano Parolai, Thomas R. Walter,

Geological and Geochemical Analysis

Research Article| December 07, 2018 Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes Atsuko Namiki; Atsuko Namiki 1Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi Hiroshima 739-8521, Japan2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Eleonora Rivalta; Eleonora Rivalta 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Heiko Woith; Heiko Woith 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Timothy Willey; Timothy Willey 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany3Geosciences, University of Montana, Missoula, Montana 59812, USA4Earth and Environmental Science, University of Potsdam, 14469 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Stefano Parolai; Stefano Parolai 5Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico TS, Italy Search for other works by this author on: GSW Google Scholar Thomas R. Walter Thomas R. Walter 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Atsuko Namiki 1Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi Hiroshima 739-8521, Japan2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Eleonora Rivalta 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Heiko Woith 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Timothy Willey 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany3Geosciences, University of Montana, Missoula, Montana 59812, USA4Earth and Environmental Science, University of Potsdam, 14469 Potsdam, Germany Stefano Parolai 5Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico TS, Italy Thomas R. Walter 2GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany Publisher: Geological Society of America Received: 26 Jun 2018 Revision Received: 24 Sep 2018 Accepted: 11 Nov 2018 First Online: 11 Dec 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (1): 67–70. https://doi.org/10.1130/G45323.1 Article history Received: 26 Jun 2018 Revision Received: 24 Sep 2018 Accepted: 11 Nov 2018 First Online: 11 Dec 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Atsuko Namiki, Eleonora Rivalta, Heiko Woith, Timothy Willey, Stefano Parolai, Thomas R. Walter; Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes. Geology 2018;; 47 (1): 67–70. doi: https://doi.org/10.1130/G45323.1 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 existence of a causal link between large earthquakes and volcanic unrest is widely accepted. Recent observations have also revealed counterintuitive negative responses of volcanoes to large earthquakes, including decreased gas emissions and subsidence in volcanic areas. In order to explore the mechanisms that could simultaneously explain both the positive and negative responses of volcanic activity to earthquakes, we here focus on the role played by topography. In the laboratory, we shook a volcanic edifice analogue, made of gel, previously injected with a buoyant fluid. We find that shaking triggers rapid migration of the buoyant fluid upward, downward, or laterally, depending on the fluid's buoyancy and storage depth; bubbly fluids stored at shallow depth ascend, while low-buoyancy fluids descend or migrate laterally. The migration of fluids induced by shaking is two orders of magnitude faster than without shaking. Downward or lateral fluid migration may decrease volcanic gas emissions and cause subsidence as a negative response, while upward migration is consistent both with an increase in volcanic activity and immediate unrest (deformation and seismicity) after large earthquakes. The fluid migration is more efficient when the oscillation frequency is close to the resonance frequency of the edifice. The resonance frequency for a 30-km-wide volcanic mountain range, such as those where subsidence was observed, is ∼0.07 Hz. Only large earthquakes are able to cause oscillation at such low frequencies. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.