Westdahl reported activity

Event Name : Westdahl 2010/7

Start:

July 2010

Observed

Seismicity with no confirmed eruption:

Description: From Neal and others (2014): "In late July, AVO seismologists noted a marked increase in lower crustal seismicity at Westdahl. Most of the seismicity was long period in character however some volcano-tectonic events also were recorded.

Deep (>10 km or >6.2 mi), low frequency events located with the Westdahl seismograph network tend to cluster in an area northwest of the volcano's summit. Past analysis of InSAR results for Westdahl by Lu and others (2003) suggests a shallow magma reservoir beneath the volcano. Continued inflation of the volcano is consistent with ongoing accumulation of melt at shallow levels. Such ascent of magma from depth may explain the 2010 seismicity at Westdahl."