10/19/2023 0 Comments Mount erebus volcanoInternal 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. Story by Kathryn Hansen.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. ![]() NASA Earth Observatory image by Joshua Stevens, using data from NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team. The flat expanse is disrupted by the Erebus Ice Tongue-fast-flowing glacial ice that cuts into the sound like a knife. Nearby areas that appear smooth are the snow- and ice-topped waters of McMurdo Sound. These areas are clear of surface snow, exposing glacial ice. This eruption type can eject masses of molten rock up to 250 meters from the lake.īeyond the volcano and its shadow, sunlight illuminates vivid blue patches amid the white. On occasion, a large bubble of gas, or “gas slug,” rises up from within the volcano and triggers a Strombolian eruption. McMurdo Station just 35 kilometers (22 miles) away-means the volcano has been accessible to and well-studied by researchers.Īlthough not visible in this image, gases regularly rise from the lava lake on the volcano’s summit. Nearby research facilities-including the U.S. ![]() That’s not hard to do, given that the volcano stands 3,794 meters (12,450 feet) above sea level-the second-tallest of more than 100 known Antarctic volcanoes.Įrebus is the dominant feature of Ross Island, which juts out of the Ross Sea and the Ross Ice Shelf. The Sun angle was still low enough that morning to illuminate the volcano’s eastern slopes, while the volcano cast a mighty shadow to the west. The area was just days away from constant 24-hour sunlight when this image was acquired. The image is false-color but looks natural, which is a result of visible and near-infrared wavelengths of light (ASTER bands 3, 2, 1). Mount Erebus is Earth’s southernmost active volcano.Įrebus is featured in this image acquired on October 19, 2019, by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite. But there are a few landmarks that stand out from the endless white, including a volcano that continuously emits gases and occasionally erupts. Most of the Antarctic continent is buried under the planet’s largest single mass of ice.
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