Twin sources of high‐frequency volcanic tremor of Izu‐Oshima Volcano, Japan
作者:
Muneyoshi Furumoto,
Takahiro Kunitomo,
Hiroshi Inoue,
Isao Yamada,
Koshun Yamaoka,
Akira Ikami,
Yoshio Fukao,
期刊:
Geophysical Research Letters
(WILEY Available online 1990)
卷期:
Volume 17,
issue 1
页码: 25-27
ISSN:0094-8276
年代: 1990
DOI:10.1029/GL017i001p00025
数据来源: WILEY
摘要:
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. We 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 (>5Hz) 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
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