bursts of
seismic tremor (1–
3 Hz), and later becoming
periodic with energy between 2 and 8 Hz. After
18 October, seismicity increased to three events
per day (Figure 2b). Synchronous with this
increase, the ISGPS station SKRO (Figure 1b)
moved 9 mm westward over the following eight
days, and returned to its original position on 1
November (Figure 2c), suggesting subsurface
magma movement
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