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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Very broadband strain-rate measurements along a submarine fiber-optic cable off Cape Muroto, Nankai subduction zone, Japan

Fig. 4

Example earthquake signal observations. a A moderate-sized (M2.9) event on January 27, 2020, at 16:23:31.8 (UT). The observed strain at three DAS channels (top) and the horizontal velocity seismograms at two DONET2 stations (bottom) are shown; all of the waveforms have been bandpass filtered at 2–16 Hz. b A very small (M1.1) event on January 30, 2020, at 00:20:25.7 (UT). The observed strain at three DAS channels (top) and the horizontal velocity seismograms at two Hi-net stations (bottom) are shown; all of the waveforms have been bandpass filtered at 2–16 Hz. c A teleseismic Mw7.7 event on January 28, 2020, at 19:10:24 (UT) near Cuba. The observed strain at three DAS channels (top), and the horizontal velocity seismograms at a DONET station (MRG29) and F-net station (UMJF) (bottom) are shown; all of the waveforms have been bandpass filtered at 0.01–0.1 Hz. All of the velocity data are shown relative to the origin time of the event. d DAS records for all of the channels and the earthquake in a. The amplitudes are presented as the logarithm of the normalized absolute amplitude of the strain rate, and have been bandpass filtered at 2–8 Hz

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