This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Richard 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. -
September 13, 2012 volcano activity
Fuego volcano, Guatemala makes 10,000 people to evacuate
The rising tremor we saw yesterday at Guatemalan volcanoes Fuego (station FG3) and Santa Maria (STG6) culminated in explosive outbursts at both overnight. Pulses of tremor, now interspersed with earthquakes affect nearby Pacaya volcano today.(station PCG)
Nearly 10,000 people living in communities near the volcano have been asked by the authorities to evacuate after that volcan Fuego increased his activity today. The evacuation was ordered by the authorities when a lava flow with a length of 600 meter traveled along the slopes.
The authorities have also asked the population to drive carefully as roads are covered with ash.
Picture below, the tremendous ash cloud from the erupting Fuego volcano, active since along time, but now with a major outburst! Volcanic ash rose 1500 meter above the crater. The volcano activity level increased further and continuous explosions could be heard. Fine ash has fallen in a couple of locations near the volcano.
Although the ash cloud can wel be seen going down the slopes of the volcano, insivumeh does not talk about a pyroclastic flow. More pictures of the volcano eruption.
Little Sitkin volcano, Alaska
18:15 UTC : This episode looks stronger than Tuesday’s! The birth pangs are coming stronger and closer together!
Alaska volcano observatory wrote yesterday : Elevated seismicity at Little Sitkin continues. Satellite views of the volcano have been cloudy the past 24 hours. AVO continues to closely monitor the situation and will issue further updates as conditions change.
Rodger Wilson writes :
I am returning to the field tomorrow, so all the volcanoes should quiet for the next three weeks (Ha!Ha!). Really!…I hope nothing eventful happens at Little Sitkin until I am able to view it in real time! Speaking of Little Sitkin, this morning’s seismogram is in quite stark contrast to the one recorded two days ago. Only a few small seisms visible. (station LSSA)
A few more small local earthquakes today at Popocatepetl (Mexico), complicated by the usual technical glitch which produces a bogus repeating pattern of earthquakes on the seismogram.
San Miguel volcano (El Salvador) rumbles-on with numerous low frequency earthquakes (station VSM). The tremor-like signal at the bottom of the record is transmission static and not caused by the volcano. Seismicity is “normal” at three recently active Nicaraguan volcanoes, but note the wide variance in what is considered normal earthquake activity at each.
Telica (station TELN) San Cristobal (station CRIN) and Apoyeque (APYN).
If Nevado Del Ruiz volcano (Colombia) is returning to slumber, it’s doing so fitfully as another seismic swarm (of both volcano-tectonic and low-frequency events) affects the volcano today. (station OLLZ)
Seismicity is low at Galeras volcano (station ANGV).
Numerous small low-frequency earthquakes and low level tremor have steadily declined in magnitude the past week at Tungurahua volcano (station RETU).
Seismograms recorded at New Zealand volcanoes over the past 24 hours show continuous volcanic tremor at White Island, and a few small earthquakes at the Ngauruhoe/Tongariro volcanic complex.
Recent satellite imagery shows enhanced SO2 output at Ambrym (Vanuatu). Plumes at Popo, Nevado Del Ruiz and Sakurajima (Japan) are comparable to those seen in previous images.