Yellowstone Volcano Observatory 2019 annual report

First posted March 15, 2021 For additional information, contact: Contact YVOVolcano Science Center, Yellowstone Volcano ObservatoryU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 The Observatory (YVO) monitors volcanic and hydrothermal activity associated with the magmatic system, conducts research into processes occurring beneath Caldera, issues timely warnings guidance related to potential future geologic hazards. This report summarizes activities findings of YVO during year 2019, focusing on system. Highlights 2019 included deploying a portable seismic array near Steamboat Geyser in Norris Basin that recorded signals from seven major water eruptions; semipermanent Global Positioning System array; surveying soil carbon dioxide flux temperature operating an eddy covariance system make continuous measurements; collecting analyzing samples Shoshone Basin, outlets Lewis Lakes, Cinder Pool several locations along Obsidian Creek; exploring documenting new thermal area Tern Lake was discovered 2018; measuring specific conductance rivers determine chloride total heat output system; conducting inventory features Upper as part park-wide project began sampling tree rings silica sinter deposits better understand over time.Continuing pattern started 2018, Geyser, erupted 48 times 2019—a record for calendar year! Overall, however, noteworthy geyser National Park much reduced relative previous year. Thermal Hill had returned their normal styles after Ear Spring’s September 2018 eruption did not show any significant changes 2019. Giant also experience eruptions Seismicity years, deformation which uplift 2015 paused late shifted subsidence Overall caldera floor, ongoing since or early 2016, continued at rates few centimeters (1–2 inches) per