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. -
March 6, 2013 volcano activity
We did not want to withhold our readers this absolutely great video from KDEtna (Klaus Dorschfeldt). The images have been taken during the nightly Paroxysm from early this morning. Enjoy the greatest video of Etna in 2013 !
- Rodgers daily volcano activity overview will arrive later today.
KVERT reports only a slight increase of volcanic tremor amplitude at Tolbachik volcano (Kamchatka Peninsula) overnight. Seismicity remains at a moderate level at Kizimen and Gorely volcanoes and weak at Sheveluch, Bezymianny, Kliuchevskoi, and Karymsky volcanoes.
Seismicity has risen again at Iliamna volcano (Alaska Range) (station INE) in the past day. Events as large as M1.4 occur along a (ring?) fracture located south of the volcano’s summit.
Explosions and small volcanic earthquakes continue at a frequent pace at Colima volcano (Mexico). An overflight yesterday by CENAPRED officials verified new lava extrusion (dome) is occurring within the summit crater of Popocatepetl volcano. The Popo seismogram shows exhalation (explosion) signals early-on in the record and small local earthquakes later. Exhalations occurred at an average rate of just under once per hour at Popocatepetl overnight (though note the seismogram which shows clustering of exhalations rather than periodic eruptive behavior).
Volcanic tremor appears to be on the increase at Fuego volcano (Guatemala) (station FG3) again this morning. INSIVUMEH reports that a hot avalanche descended the Rio Ceniza drainage overnight and that small strombolian explosions continue at the volcano’s summit. Four moderate vulcanian explosions occurred through this morning at the Santiaguito Dome Complex (Santa Maria volcano). Volcanic ash was propelled to 1.5 km height by the bursts and was deposited to the west over San Jose village and the Calahuache area. Volcanic tremor has become sustained and stronger at Pacaya volcano (station PCG) overnight.
Periods of weak banded tremor and a few stronger volcanic earthquakes jiggle San Cristobal volcano (Nicaragua) (station CRIN) again today. Local earthquakes continue at Momotombo volcano (station MOMN), now striking about once every 6 hours. Volcanic earthquakes and periods of tremor are more frequent at Concepcion volcano (station CONN) the past few days. Episodes of tiny volcano-tectonic events have been apparent on records from Concepcion during the same period.
Unrest (in the form of strong volcanic tremor, earthquakes and a satellite detected “hotspot”) has eased slightly, but continues at San Miguel volcano (El Salvador) (station VSM). MODIS satellite data were not updated today, so I am unable to check the status of a strong thermal anomaly detected at San Miguel yesterday.
Small earthquakes remain frequent at Machin volcano (Colombia) (station CIMA). Judging by P-S intervals on the larger events, the earthquakes are part of the southeastern “nest” of deep events (12 – 15 km depth) which has formed at the volcano over the past few years.
Volcanic tremor and earthquakes continue to intensify at Tungurahua volcano (Ecuador) (station RETU). The clouds briefly parted this morning to allow a quick glimpse of also strengthening explosive activity at the volcano’s summit. Volcanic tremor and earthquakes ebb and flow at Reventador volcano (station CONE).
A swarm of volcano-tectonic earthquakes rattled White Island (New Zealand) overnight, as tremor continues its slow climb in amplitude at the volcano.
Recent satellite imagery shows SO2-enriched plumes drifting from Popocatepetl, Nevado Del Ruiz, and Nyiragongo (DRC) volcanoes. As mentioned above, MODIS satellite thermal imagery was not updated today.