Ежемесячный отчёт Йеллоустоунской вулканической обсерватории, октябрь 2021 г..

USGS Video: ------ The November 2021 YVO Yellowstone Volcano update comes to you from a very snowy Norris Geyser Basin with a story about Porkchop Geyser’s 1989 explosion. Porkchop Geyser was named in the 1960s because it had a shape that looked a lot like a pork chop. In the 1970s to 1980s, it started having intermittent geyser eruptions, becoming more and more active. On September 5, 1989, Porkchop Geyser exploded. The vent for the geyser became so constricted that its pressure increased and it blew up. Rocks were thrown 200 feet from geyser and are visible around the geyser today. A lot of people witnessed the hydrothermal explosion, and the potential hazard is one of the reasons thermal basins are carefully monitored. But since 1989, Porkchop's been a relatively calm pool. During the month of October, seismicity in Yellowstone was at background levels. The University of Utah Seismograph Stations, which is responsib