In the summer of 2001 two groups from the Alaska Volcano Observatory (AVO) deployed temporary seismic stations in two areas on Umnak Island, Alaska (Figure 1). For AVO, such deployments are the exception rather than the rule. AVO operates a real-time seismic network of 135 stations on 25 of the 40+ historically active volcanoes in Alaska (Dixon et al., 2002), spanning a distance of just less than 2,300 km (Figure 1). This span encompasses one of the most volcanically and seismically active arcs in the world. AVO's traditional emphasis has been to study...

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