Twin sources of high-frequency volcanic tremor of Izu-Oshima Volcano, Japan

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/GL017i001p00025· OSTI ID:5386884

Furumoto, Muneyoshi; Kunitomo, Takahiro; Yamada, Isao; Ikami, Akira; Fukao, Yoshio ^[1]; Inoue, Hiroshi ^[2]; Yamaoka, Koshun ^[3]

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1. Nagoya Univ. (Japan)
2. Building Research Institute (Japan)
3. Univ. of Tokyo (Japan)

The 1986 fissure eruption of Izu-Oshima volcano was preceded and followed by strong volcanic tremor activities. The post-eruption tremor activity consists of an alternating sequence of a tremor episode lasting about 10 min and the subsequent quiescence of about 40-50 min. The authors observed this post-eruption activity by a 24-channel seismic array deployed on the caldera floor. The semblance analysis of the recorded data revealed that high frequency (>5 Hz) components of the tremor were radiated from two separated sources beneath the caldera. The tremor first occurred at one source and then migrated to the other source in a transition time of about a few minutes during each tremor episode. This transition suggests that the two sources are dynamically linked with each other in a magma-filled crack or conduit.

• OSTI ID: 5386884
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 17:1; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AFTERSHOCKS
ASIA
CALDERAS
DETECTION
DEVELOPED COUNTRIES
EARTHQUAKES
EPICENTERS
FREQUENCY DEPENDENCE
FREQUENCY RANGE
GEOLOGIC FAULTS
GEOLOGIC FISSURES
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
HZ RANGE
JAPAN
LAVA
MAGMA
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC SOURCES
SEISMIC SURVEYS
SURVEYS
VOLCANIC REGIONS
VOLCANISM