Specifically, approximately 43% of the events occur between March and May and approximately 30% occur between October and December. We hypothesize that many of these events occur in very shallow ice, based on the apparent ambient temperature-driven seasonality of the events. During each of the seven years, we note a number of large icequake swarms (up to many hundreds of events per day). Using Antelope-based methodologies, we determined the distribution and magnitude of a subset of well-recorded icequakes using data from the long-running Mount Erebus Volcano Network (MEVO) network, as well as two dense IRIS PASSCAL supported temporary networks deployed during 20 (the MEVO network consists of six broadband and nine short period stations with environmental data streams the dense arrays consisted of 24 broadband stations arranged in two concentric rings around the volcano and 99 short period stations deployed near the summit of Erebus volcano and along the Terror- Erebus axis of Ross Island). In addition to generally investigating mountain glacial ice seismicity in cold and dry glacial environments, we also hope to exploit icequakes as local sources for tomographic imaging of the volcano’s interior in conjunction with 2008-2010 active source and explosive volcanism data. We examine icequake seismograms recorded by both long-running and temporary densification deployments spanning seven years (2003-2009) to assess event frequency, size, apparent seasonality, event mechanism, and geographic distribution.
Seasonality of Shallow Icequakes at Mount Erebus Volcano, Antarcticaīackground (non-eruptive) seismicity at Mount Erebus Volcano is dominated by icequake activity on its extensive ice fields and glaciers.
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