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

Atsuko Namiki, Eleonora Rivalta, Heiko Woith, Timothy Willey, Stefano Parolai and Thomas R. Walter
Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes
Geology (Boulder) (December 2018) 47 (1): 67-70

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 approximately 0.07 Hz. Only large earthquakes are able to cause oscillation at such low frequencies.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 1
Title: Volcanic activities triggered or inhibited by resonance of volcanic edifices to large earthquakes
Affiliation: Hiroshima University, Graduate School of Integrated Arts and Sciences, Hiroshima, Japan
Pages: 67-70
Published: 20181207
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 2019-007032
Categories: SeismologyQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019027
Illustration Description: illus.
Secondary Affiliation: German Research Centre for Geosciences, DEU, GermanyIstituto Nazionale di Oceanografia e di Geofisica Sperimentale, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201906
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