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Fig. 5 | Earth, Planets and Space

Fig. 5

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

Fig. 5

Spatio-temporal variation of seismic velocity of whole Japanese Islands. This velocity variation was derived by applying SRM to ambient-noise data recorded by 767 Hi-net stations (blue symbols). Each panel shows the latest date within the window of current trace: a 2 February 2016, b 26 April 2016, c 2 August 2016, and d 27 November 2016. Warm colors indicate regions where seismic velocity was decreased. The Kumamoto earthquakes (Mw7) occurred on 16 April, and the Mt Aso eruptions occurred on 7 and 8 October

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