![]() These earthquake counts are preliminary and subject to change as the earthquakes are reviewed by seismologists. Only earthquakes with magnitudes greater than M1.0 are reported here. If there are no comments for a volcano, CalVO has detected no earthquakes with magnitudes greater than or equal to M1.0, or any other kind of unrest. One earthquake greater than M1 was recorded at the Salton Buttes, with a magnitude of M1.5.ĬalVO's Weekly Update only highlights volcanoes which have experienced seismic activity or volcanic unrest. One earthquake greater than M1 was recorded at Mammoth Mountain, with a magnitude of M2.2.Įight earthquakes greater than M1 were recorded in the Sierra Nevada Block, south of Mammoth Mountain and Long Valley, with a magnitude of M2.5. One earthquake greater than M1 was recorded in the Clear Lake Volcanic Field, with a magnitude of M1.5. Typical seismicity was recorded at The Geysers geothermal field south of the Clear Lake Volcanic Field 65 earthquakes greater than M1 were recorded, with the largest having a magnitude of M2.8. Past Week Observations for Octo(0000h PDT) through Octo(2359h PDT): Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes. Tuesday, October 17, 2023, 10:16 AM PDT (Tuesday, October 17, 2023, 17:16 UTC)Īctivity Update: All volcanoes monitored by CalVO show normal background earthquake activity and ground movement. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.ĬALIFORNIA VOLCANO OBSERVATORY WEEKLY UPDATE The Alaska Volcano Observatory is a cooperative program of the U.S. Jessica Larsen, Acting Coordinating Scientist, UAFGI jflarsen (907) 378-5460 Matt Loewen, Acting Scientist-in-Charge, USGS (907) 786-7497 Trident Volcano is monitored by local seismic sensors, web cameras, regional infrasound and lightning networks, and satellite data. We expect additional shallow seismicity and other signs of unrest, such as gas emissions, elevated surface temperatures, and ground movement, to precede any future eruption if one were to occur. Increases in seismic activity have been detected previously at Trident Volcano and other similar volcanoes and did not result in eruptions. The current period of seismic unrest began in August 2022. No volcanic activity was observed in partly clear webcam or satellite images over the past 24 hours. Small earthquakes continue to occur near Trident and neighboring volcanoes. Local seismic and infrasound sensors, web cameras, regional infrasound and lightning networks, and satellite data are used to monitor the volcano.ĥ8☁4'3" N 155☆'9" W, Summit Elevation 3599 ft (1097 m) No explosive events have occurred since a single event in May 2021. The current lava flow began erupting in July 2021. Satellite and web-camera views were obscured by clouds. Earthquake activity remained low over the past day. Slow eruption of lava in the summit crater of Great Sitkin Volcano likely continues. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to detect eruptions.ĥ2☄'35" N 176☆'39" W, Summit Elevation 5709 ft (1740 m) Local seismic and infrasound sensors, web cameras, and a geodetic network monitor Shishaldin Volcano. However, previous eruptions of Shishaldin Volcano have lasted weeks to months with repeated cycles of eruptive activity like those seen since July. It is unknown how long this period of ongoing activity will last. These events have been preceded by increases in seismicity in the hours to days before they occur. ![]() Twelve significant explosive events have occurred at Shishaldin since July 12, 2023. Webcam and satellite views of the volcano have been blocked by clouds over the past day. Seismic activity remains elevated and consists of seismic tremor and small, low-frequency earthquakes. ![]() ![]() Volcanic unrest continues at Shishaldin Volcano.
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