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Extremely similar volcano sounds from two separated fumaroles at the Tatun volcano group in Taiwan

C. H. Lin, Y. C. Lai, M. H. Shih, C. J. Lin, J. S. Ku and H. C. Pu
Extremely similar volcano sounds from two separated fumaroles at the Tatun volcano group in Taiwan
Seismological Research Letters (November 2018) 89 (6): 2347-2353

Abstract

Volcanic sound in the form of acoustic energy in the air is occasionally observed from active volcanoes, due to air turbulence during or resonance before eruptions. Although a variety of volcanic sounds have been described, it is unusual to find similar signatures from different sources. Here, we discuss volcanic sounds with extremely similar signatures produced repeatedly and alternately from two fumaroles with approximately 7 km separation at the Tatun volcano group (TVG) in Taiwan. Those volcanic sounds were well recorded by two infrasonic sensors and tens of seismic stations, due to ground shaking converted from the acoustic waves. Because all acoustic signals had extremely similar frequency content, they were probably created by the same subsurface resonator. Also, a gradual decrease (glide) in dominant frequencies from approximately 31 to approximately 22 Hz suggests that resonator size may have increased by up to two times, due to strong infiltration of volcanic gases from a deeper reservoir. The observed alternative and repeated acoustic signals, with a significant regularity of time delays between and among the pairs, probably indicate the existence of a deeper volcanic reservoir beneath the TVG, providing a persistent heat source that generates volcanic sounds and the earthquakes and tremors previously observed in the area. Thus, some phreatic eruptions might take place at the TVG in the future.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 89
Serial Issue: 6
Title: Extremely similar volcano sounds from two separated fumaroles at the Tatun volcano group in Taiwan
Affiliation: Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Pages: 2347-2353
Published: 201811
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 36
Accession Number: 2019-003620
Categories: Igneous and metamorphic petrologyQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N25°06'00" - N25°18'00", E121°30'00" - E121°42'00"
Secondary Affiliation: Taiwan Volcano Observatory at Tatun, TWN, TaiwanCentral Weather Bureau, TWN, Taiwan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201904
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