Fig. 4: Spatio-temporal evolution of icequake activity.

Each property is shown at the measurement locations (location number shown on top panel as in Fig. 1b). a, g, m, s Surface velocity at locations 1 (down-glacier, salmon) and 8 (up-glacier, light red) with the same five highlighted periods (dark red) as in Fig. 3. b–f, h–l, n–r, t–w Averaged icequake rate (size-coded) and normalized icequake amplitude (color-coded). Shaded areas represent the glacier geometry (blue) over the bedrock (gray). The dark-shaded gray area of the bed shows the glacier part grounded below sea level and the light-shaded gray area, the glacier part grounded above sea level. See Supplementary Figs. 4 and 5 for complete time series of icequake rate and amplitude.