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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Continuous monitoring of instrumental clock errors at 50 volcanoes in Japan based on seismic interferometry

Fig. 1

Topographic maps and examples of stacked cross-correlation functions (SCCF) waveforms. a Locations of 50 volcanoes. 13 volcanoes where clock errors occurred during the study period are indicated by red triangles. b Topographic maps of 6 volcanoes where clock errors occurred during the study period. The red inverted triangles on the topographic maps represent seismic stations for which clock errors were detected. Note that topographic maps of all 50 volcanoes are shown in Additional file 1: Figs. S1–S6. c Examples of temporal changes in SCCF (3-day-stacked CCF) waveforms for station pairs with clock errors. Horizontal black arrows represent the time periods when clock errors occurred (see also Additional file 1: Figs. S7–S9 for other station pairs for which clock errors were detected)

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