Description: From Cameron and others, 2023: "Throughout 2018, Westdahl volcano (an informal name that herein includes Westdahl Peak, Westdahl caldera, and associated intra- and extra-caldera features) continued its long-term steady inflation, which has persisted since the deformation was first observed after the installation of a GPS network on Unimak Island in 2008. An analysis of Westdahl volcano InSAR data by Lu and others (2003) indicated a shallow magma reservoir exists beneath the volcano; the continued inflation is consistent with an ongoing accumulation of magma at shallow depths. Westdahl volcano remained at GREEN and NORMAL throughout 2018."
From Orr and others, 2023: "In 2019, Westdahl volcano continued its long-term trend of steady inflation, which has persisted since the trend was first observed after the installation of a GNSS network on Unimak Island in 2008. An analysis of Westdahl volcano InSAR data by Lu and others (2003) indicated a magma reservoir exists beneath the volcano at a depth of about 6 km [3.7 mi] below sea level. Continued inflation of Westdahl volcano is consistent with an ongoing accumulation of melt at relatively shallow depths. The volcano remained at GREEN and NORMAL throughout 2019."