Volcano activity May 5, 2013

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. -

May 5, 2013 volcano activity

AVO reported later yesterday that low-level explosive activity has become continuous at Cleveland volcano (Aleutian arc) (not seismically monitored).  Recent satellite images show a now pronounced "hotspot" at the volcano's summit with a trailing eruption plume.  Small seismic events continue to be frequent at Korovin volcano (Aleutian arc) (station KOWE).


KVERT reported no significant changes in eruptive/seismic activity overnight at the five Kamchatkan volcanoes: Tolbachik, Sheveluch, Bezymianny, Kizimen, and Karymsky.  Moderate seismicity continues at Gorely volcano, in concert with strong hydrothermal emissions there.

Small earthquakes are frequent beneath Mammoth Mountain volcano (CA) (station MRD).

At the time of this writing, the Colima (Mexico) volcanocam showed a hazy dust/ash plume drifting from the volcano.  MODIS satellite thermal imagers detected several "hotspots" on the lower flanks of the active Fuego cone.  Whether they are related to recent pyroclastic flows from the volcano, or from agricultural burning is unclear.  Activity at Popocatepetl volcano has remained relatively minor in nature, with essentially continuous degassing punctuated an average of once an hour by small explosive outbursts of gas and ash.  The Popo seismogram shows several larger exhalation events occurring in the past several hours.



Activity at the Guatemalan volcanoes also remains mainly internal with small strombolian explosions affecting Pacaya (station PCG) and Fuego (station FG3) volcanoes, and a single vulcanian explosion overnight at Santiaguito Dome Complex (Santa Maria volcano)(station STG3).  Small avalanches of incandescent blocks and ash also occasionally occur at both Fuego and Santiaguito.


Amplitudes of volcanic earthquakes have decreased overnight at San Miguel (El Salvador) (station VSM).  Bands of telemetry interference mar the seismic records.

Small seismic events (including at least one volcanic earthquake) dot seismograms again today at Poas volcano (Costa Rica) (station POA2).

Volcano-tectonic earthquakes continue to rattle Nevado Del Ruiz volcano (Colombia) (station OLLZ).  Volcanic tremor amplitude also periodically increased at the volcano overnight.  Tiny earthquakes are also evident on seismograms form Machin volcano (station CIMA).  Gas and ash emission events mark seismograms at Galeras volcano (station CUVZ) again today.

Eruptive activity remains at a moderate level today at Tungurahua volcano (Ecuador) (station RETU).  Several "cannon-like" explosions have been reported overnight and light ashfall has affected virtually all sectors surrounding the volcano.  Volcano seismicity is reduced at Reventador volcano (station CONE).


The Planchon-Peteroa (Chile) volcanocam shows no untoward activity occurring at the volcano today.


Recent OMI satellite images show SO2-enriched plumes drifting from:  Popocatepetl, Reventador, Tungurahua, and Sangay volcanoes.  MODIS satellite thermal imagery captured "hotspots" at Tolbachik, Colima, Popocatepetl, and Stromboli (Italy) volcanoes.