Moyorodake [Medvezhia] volcano (Iturup, Etorofu) Island, Japan/Russia) - Smithsonian / USGS Weekly Volcanic Activity Report for 26 July-1 August 2017 (New Activity / Unrest)

Wed, 26 Jul 2017, 06:00
06:00 AM | BY: VN
The Institute of Volcanology and Geodynamics (Russian Academy of Natural Science) reported that during the morning of 31 July volcanologists working on Kudryavy, a stratovolcano of the Medvezhia volcanic complex, noted a sharp increase in the volume of vapor-and-gas emissions, with a plume rising more than 1 km. The emissions rose from a new crater, Malysh, that was formed after the 1999 phreatic eruption. A significant increase in temperature (an average of 100 degrees Celsius) was measured at fumarolic sites, and new high-temperature areas were noted.
Crusts of native sulfur at the boundaries of high-temperature areas were melting and burning. Two people at the top of the volcano and workers at the main base camp (3.5 km S) self-evacuated.



The report noted that a M 5.7 earthquake had occurred at 0800 that same morning, 200 km NE, within the same system of tectonic faults that the volcano resides on. The volcano has a permeable system of fissures, through which there has been constant degassing for more than 130 years.

Source: Institute of Volcanology and Geodynamics, Russian Academy of Natural Science
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From: Global Volcanism Program, 2017. Report on Moyorodake [Medvezhia]. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 26 July-1 August 2017. Smithsonian Institution and US Geological Survey.

Previous news

Thu, 26 Mar 2015, 17:39
Satellite images showed a weak thermal anomaly over Kudryavy, a stratovolcano of the Medvezhia volcanic complex, on 18 March. ... Read all
Wed, 18 Mar 2015, 06:00
SVERT reported that satellite images showed a weak thermal anomaly over Kudryavy, a stratovolcano of the Medvezhia volcanic complex, on 18 March. ... Read all
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