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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Seismic observation using distributed acoustic sensing around the Tsugaru Strait at the Japan and Kuril Trenches, northeastern Japan

Fig. 4

Relationship between DAS strain rate amplitude, hypocentral distance, and magnitude. a Epicenters of earthquakes used for the investigation of the relationship. The red line is the same as in Fig. 1b. Dashed contours indicate the isodepths at the top of the subducting Pacific plate at 25 km intervals (Nakajima and Hasegawa 2006; Kita et al. 2010). b Relationship between site-corrected DAS amplitude and hypocentral distance for all events. Different color and shape combinations indicate different events. c Relationship between site-corrected strain rate amplitude A (nstrain/s) at hypocentral distance of 22.4 km and magnitude M for events around the Tsugaru Strait. The dashed line represents the regression line between A and M. d Same as (b), but site-corrected strain rate amplitude calibrated to M 1. The dashed line represents the regression line between site-corrected strain rate amplitude A (nstrain/s) and hypocentral distance r (km). The gray marks in c and d show the discarded events due to the saturated amplitudes discussed in “Relationship between magnitudes and DAS strain rate amplitudes” section

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