im-
proved by a double-difference location meth-
od [Slunga et al., 1995], and supported by P -
wave particle-motion analysis at GRF, reveal a
northerly trending event distribution, centered
at the southern caldera rim, ~1 km east of the
main eruption site (Figure 1b). Focal depths
mostly concentrate above 4 km and decrease
by ~2 km near the eruption onset.
The detection threshold
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