Fig. 1
From: An approach to source characterization of tremor signals associated with eruptions and lahars
Source locations of eruption and lahar tremor signals. a Observation station locations (solid triangles) at Tungurahua volcano, Ecuador. Black and red circles represent source locations and amplitudes, respectively, of an eruption tremor episode on 16–17 March 2013 (Fig. 2). Orange circles indicate source locations and amplitudes of other eruption tremor episodes listed in Table 1. The radius of each circle indicates the source amplitude scaled to the reference circle at the lower left of the map. Topographic contour interval is 100 m. Inset map shows the location of Tungurahua volcano. b Source locations of lahar tremor signals listed in Table 2 (blue circles)