This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Rodger Wilson who specializes in Volcano seismicity and Armand Vervaeck. Please feel free to tell us about new or changed activity if we haven't written about it. -
January 25, 2013 volcano activity
KVERT reports that eruptive activity, in the form of lava extrusion, continues at: Tolbachik, Kizimen, Sheveluch, and Bezymianny volcanoes. Occasional collapses and explosions accompany dome extrusion at Sheveluch, while Strombolian explosive activity occurs at the summit of Klyuchevskoi volcano. Strombolian to Vulcanian explosive activity continues at Karymsky volcano as well. Continuous strong volcanic tremor is reported at Tolbachik and moderate to low levels of seismicity affect the other erupting Kamchatkan volcanoes. A moderate level of seismicity also occurs at Gorely volcano which currently only displays strong degassing activity.
Apparently jealous over another Pacific Northwest volcano (Mount Rainier) getting some press (in yesterday's report), Mount Hood volcano (OR) (station TDH) fired-off a volly of small earthquakes. A few tiny events continue at the volcano.
Small earthquakes also continue at Mammoth Mountain volcano (CA) (station MMS). Events with extended codas (tails) are regional earthquakes from a swarm taking place in Nevada.
Volcanic earthquakes, small explosions, and rockfalls continue at Colima volcano (Mexico). Exhalations continue to occur at an average rate of about one per hour at Popocatepetl volcano. The Popo seismogram shows volcanic tremor and small, local earthquakes again today.
Episodes of volcanic tremor (likely accompanied by explosions/exhalations) are visible on seismograms recorded at Santa Maria volcano (Guatemala) (station STG6). The "spikey" nature of the seismic record is due to equipment malfunction not volcanic activity.
Numerous volcanic earthquakes continue to hum within San Cristobal volcano (Nicaragua) (station CRIN). A few, small volcanic earthquakes are visible on seismic records from Cerro Negro volcano (station CNGN) today.
Fluctuating volcanic tremor and volcanic earthquakes continue at San Miguel volcano (El Salvador) (station VSM).
Seismograms from the Colombian volcanoes were not accessible at the time of this writing.
Strong volcanic tremor and earthquakes accompany lava extrusion and explosive activity at Reventador volcano (Ecuador) (station CONE).
Curious about yesterday's SO2 anomaly over Ubinas volcano (Peru), I checked the Instituto Geofisico del Peru's webpage and found that long-period seismicity (associated with fluid/gas movement) has been more frequent at the volcano this past week.
SERNAGEOMIN reports a continued high level of internal activity at Copahue volcano (Chile-Argentina border). A gas (with some ash?) plume eminating from the volcano is visible in today's volcanocam picture.
Strong volcanic tremor and frequent hybrid earthquakes (red spikes) continue at White Island volcano (New Zealand) today. Seismicity is low at restive compatriot volcanoes Tongariro and Ruapehu.
GNS Science New Zealand published a new report on White Island earlier today :
A gas flight was undertaken this morning at White Island by GNS scientists. It showed a level of gas emitted from the volcano similar to that of December 2012. Mud geysering is continuing in the crater lake and earthquake activity remains above background. Carbon dioxide (CO2) flux was 1,800 tons per day, sulphur dioxide (SO2) flux was 366 tons per day and hydrogen sulphide (H2S) flux was 15 tons per day. These values are similar to that from the last gas flight survey on 19 December 2012. Observations during the flight revealed that the mud geysering in the main crater lake is still vigorous. While the new gas data do not suggest an imminent large eruption, both the ongoing mud geysering and the increased seismic activity indicate that White Island is still at an elevated state of unrest. Future eruptions are possible with little or no warning. The level of unrest does mean that there is an increased hazard to visitors.
Recent satellite imagery shows SO2-enriched plumes of various sizes drifting from Tolbachik, Popocatepetl, Fuego (Guatemala), Ambrym (Vanuatu), and Raung (Java) volcanoes.