![]() The experiment, jointly funded by the National Science Foundation and USGS, is designed to produce a better picture of the magma plumbing system under the volcano. Helens” (iMUSH) will start this summer and run for the next few years. In a previously planned but related development, an experiment called “Imaging Magma Under St. ![]() Additional research results will be posted in USGS Updates, Information Statements, and on the USGS-CVO website. Helens continues to help scientists interpret behaviors at other volcanoes and to improve eruption forecasting capabilities. Both types of measurements are sensitive to changes in the amount or depth of subsurface magma. ![]() Surveys will measure the types and amounts of volcanic gases being released, and the strength of the gravity field at the volcano. In an effort to learn more about activity beneath the volcano, they will conduct two additional types of measurements this summer. USGS and PNSN are continuing to monitor ground deformation and seismicity at Mount St. Re-pressurization of a volcano’s magma reservoir is commonly observed at other volcanoes that have erupted recently, and it can continue for many years without an eruption. Helens is in an active period, as it has been since 1980, and it does not indicate that the volcano is likely to erupt anytime soon. It is likely that re-pressurization is caused by arrival of a small amount of additional magma 4-8 km (2.5-5 miles) beneath the surface. Helens has been slowly re-pressurizing since 2008. Careful analysis of these two lines of evidence now gives us confidence to say that the magma reservoir beneath Mount St. Helens, scientists at the USGS Cascades Volcano Observatory (CVO) and the Pacific Northwest Seismic Network (PNSN) have been monitoring subtle inflation of the ground surface and minor earthquake activity reminiscent of that seen in the years following the 1980-1986 eruptions. Since the end of the 2004-2008 dome-building eruption at Mount St. Helens indicates that the volcano remains active and is showing signs of long-term uplift and earthquake activity, but there are no signs of impending eruption. Posted via the USGS Volcano Notification Service (VNS) Īnalysis of current behavior at Mount St. Alert Level: NORMAL, Color Code: GREEN 16:05:42 UTCĬASCADES VOLCANO OBSERVATORY INFORMATION STATEMENT ![]()
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