![]() Key scientific questions include linking conduit processes to near-field deformations, explosion physics, magmatic differentiation and residence, and effects on Antarctic atmospheric and ice geochemistry. With an elevation of 3794 m and a volume of ~1670 km3, Erebus offers exceptional opportunities for extended study of volcano processes because of its persistent, low-level, strombolian activity ( Volcano Explosivity Index 0-1) and exposed summit magma reservoir (manifested as a long-lived phonolitic lava lake). (McMurdo) and New Zealand (Scott) Antarctic bases. Mount Erebus is a large (3794 m) stratovolcano that forms the centerpiece of Ross Island, Antarctica, the site of the principal U.S. Multidisciplinary experimental agendas are increasingly being employed to meet the challenge of understanding active volcanoes and their hazards. Internal and eruptive volcano processes involve complex interactions of multi-phase fluids with the solid Earth and the atmosphere, and produce diverse geochemical, visible, thermal, elastic, and anelastic effects. Karstens, Richard Kurnik, Chuck McGowan, Murray McNamara, Sara Meertens, Chuck Pauley, Bruce Richmond, Matt Ruiz, Mario Real-Time Data Received from Mount Erebus Volcano, AntarcticaĪster, Richard McIntosh, William Kyle, Philip Esser, Richard Bartel, Beth Ann Dunbar, Nelia Johns, Bjorn Johnson, Jeffrey B. A shallow mechanism is predicted by 1-D thermal skin depth calculations that show that annual temperature fluctuations decay by 1/e within the top few meters of ice. Each of these times feature rapidly changing ambient air temperatures due to the high latitude appearance/disappearance of the sun. 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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