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Table 1 Specifications of the stations used in this study. Stations in italic were deployed for seafloor observation

From: Upper boundaries of the Pacific and Philippine Sea plates near the triple junction off the Boso Peninsula deduced from ocean-bottom seismic observations

Station Natural frequency of sensor (Hz) Sampling frequency (Hz) Number of stations Observation period
BBOBS 0.0228 200 4 Mar. 2012–Mar. 2013
SPOBS 4.5 100 7 Mar. 2012–Mar. 2013
SPOBS 4.5 100 10 May 2012–Mar. 2013
SPOBS 4.5 100 3 Dec. 2012–Mar. 2013
ERI OBS 1 200 15 Oct. 2011–Aug. 2012
ERI OBS 1 200 35 Apr.–Nov. 2012
NIED (Hi-net) 1, 3, 5 100 15