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ID 27776
file
creator
Nakata, Ryoko
Tsuruoka, Hiroshi
NDC
Earth sciences. Geology
abstract
Slow slip events1 are accompanied by swarms of non-volcanic tremor2, 3 along the subduction zone of the Philippine Sea plate in southwest Japan: the swarms often occur with a periodicity of about 12 or 24 h (refs 4, 5). These episodic events are considered to be a manifestation of stress relaxation at the subducting plate interface1, 6, 7. Here, we analyse seismic data to record the locations and durations of non-volcanic tremor swarms that occurred in May 2005 and February 2006. We evaluate the magnitude of stress changes produced by slow slip events as well as the effective normal stress on the plate interface where slow slip events occur. We find that the observed periodicity in tremor occurrence originates from a combined effect of the periodic stress due to Earth tides and the transient stress due to slow slip events. Our calculations show that non-volcanic tremor is sensitive to stress change. This phenomenon can therefore be effective in monitoring the process of stress relaxation at subducting plate interfaces.
journal title
Nature Geoscience
volume
Volume 1
issue
Issue 1
start page
676
end page
678
date of issued
2008
publisher
Nature Pub Group
issn
1752-0894
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
relation url
department
Graduate School of Science



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