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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Real-time crustal monitoring system of Japanese Islands based on spatio-temporal seismic velocity variation

Fig. 8

Stretching coefficient C(E) maps determined by using a–e the ARM and f–j the SRM. The SRM results show higher C(E) values than the ARM results because in the SRM the current trace always overlaps the reference trace. Panels d and e show that C(E) decreased because the current trace has continued to separate in time from the fixed reference trace and also is affected by multiple eruptions, such that the velocity variation could become unstable. The ARM appears to be useful to detect changes in the scatter wave, whereas the SRM determines velocity variations with high stability and high temporal resolution

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