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Fig. 5 | Earth, Planets and Space

Fig. 5

From: Source rupture process of the 2016 central Tottori, Japan, earthquake (M JMA 6.6) inferred from strong motion waveforms

Fig. 5

a Spatial relationship of near-fault stations and coseismic slip distribution of the 2016 central Tottori earthquake. Black and green stars denote the hypocenter of the mainshock (the 2016 central Tottori earthquake) and the largest foreshock. Blue and magenta squares denote the center of the largest-slip subfaults in R1 and R2, respectively (emphasized subfaults in Fig. 2c). Cyan shade denotes the possible radiation region of the second wave packet. b Observed horizontal velocity waveforms at TTR005 (K-NET Kurayoshi), TTRH07 (KiK-net Sekigane), and OKYH10 (KiK-net Kamisaibara) during the mainshock (black) and the largest foreshock (green) in the low frequency band (0.1–1.0 Hz). The waveform record with borehole observation is shown at TTRH07, while the record with ground surface observation is shown at OKYH10. Broken blue and solid magenta lines denote theoretical arrival times of direct S-waves radiating from the center of the largest-slip subfaults in R1 and R2 (emphasized subfaults in Fig. 2c or colored squares in Fig. 5a) at the peak time of their slip velocities (arrows in the emphasized subfaults in Fig. 2c). c As for Fig. 5b but in the high frequency band (2.0–10 Hz). Orange bars denote two major wave packets in the high-frequency waveforms of the mainshock. d Horizontal envelopes of the high-frequency velocity waveforms. Red line in the envelope at TTR005 denotes its peak time. Light purple zone at TTRH07 denotes the expected range of arrival time of direct S-wave from the radiation region of the second wave packet (cyan shade in Fig. 5a) at the radiation time. Cyan region in the envelope at OKYH10 corresponds to the second wave packet defined in the travel-time analysis

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