All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.
Observations for January 1, 2016 (0000h PST) through January 31, 2016 (2359h PDT):
Mt Shasta: No earthquakes at or above M1.0 were detected.
Medicine Lake: No earthquakes at or above M1.0 were detected.
Lassen Volcanic Center: Eleven M1.0 or greater earthquakes were detected, with the largest registering M2.26. Many of these events occurred during two minor seismic swarms on January 2, 2016 near the Shasta-Tehama-Plumas County lines about 12 km northeast of the town of Mineral and on January 10-11, 2016 near the Tehama-Plumas County line about 15 km east of the town of Mill Creek.
Clear Lake Volcanic Field: Two earthquakes of M1.0 or greater were detected. The largest was M1.18. [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.95].
Long Valley Volcanic Region: In Long Valley Caldera, 7 earthquakes of M1.0 or greater were detected. The largest event registered M1.81. In the Mono Craters region, 5 earthquakes of M1.0 or greater were detected, with the largest registering M2.59. One earthquake of M1.0 or greater was detected under Mammoth Mountain (M1.16). [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M2.17].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Three earthquakes of M1.0 or greater were detected. The largest registered M2.06.
Coso Volcanic Field: The typical high level of seismicity was observed, with 9 earthquakes M1.0 or greater. The largest registered M2.31.
February 05 , 2016. California Volcanoes, United States :
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN
Source : Calvo.
Photos : Marli Bryant Miller / Geology and Earth science images