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Detection of short‐term slow slip events along the Nankai Trough via groundwater observations
Author(s) -
Kitagawa Yuichi,
Koizumi Naoji
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl058322
Subject(s) - groundwater , geology , seismology , slip (aerodynamics) , subduction , induced seismicity , geotechnical engineering , tectonics , engineering , aerospace engineering
In order to develop new tools or techniques to detect short‐term slow slip events (S‐SSEs) along subduction zones, we attempted to detect S‐SSEs by conducting groundwater pressure observations. At ANO station, which is a groundwater observation station operated by the Geological Survey of Japan, the National Institute of Advanced Industrial Science and Technology, for earthquake prediction research, groundwater pressures changed due to six S‐SSEs that occurred near ANO from June 2011 to April in 2013. The fault models of these S‐SSEs, which were estimated mainly by observing the crustal strains and tilts, explained the changes in the groundwater pressures. If the strain sensitivity of the observed groundwater pressure or level is larger than 1 mm/nstrain and the noise level is smaller than 50 mm/day, it is possible to detect S‐SSEs that occur in southwest Japan by conducting groundwater pressure or level observations.