August 28 , 2016. EN. Sabancaya , Sinabung , Cleveland , Sotara .
August 28 , 2016.
Sabancaya, Peru :
LP-type events (associated with passages of volcanic fluids) continue to show a slight increase for this period, averaging 27 LP / day (Report No. 26-2016: 20LP / day).
As regards the energy of these type of events LP, it remains low
The type of earthquakes VTPS (proximal–Tectonic Volcano, located less than 6 km from the crater), show a decrease in their average (3VTP / day), compared to the previous report (Report No. 26-2016: 8 VTP / day). The maximum energy reached 2.7 Ml (local magnitude).
The type events volcano-tectonic Distal (EDV) located and plotted show 2 seismic foci. The first focus is located 9 km southeast of the town of Maca (14 km northeast of the crater of the volcano Sabancaya).
This seismic focus remains active in the area since the second week of February 2016. This highlights an earthquake of magnitude M3.6 recorded on August 16 at 2:16 UTC, at a depth of 8 km.
The second seismic focus is located 25 km northeast of the crater, this focus has been triggered by the reactivation of the fault of Ichupampa, which remained active from August 14, 2016. The strongest earthquake in this second zone was recorded on August 16 at 11:23 hours UTC, at a depth of 8 km.
The VTPS type events (proximal–Tectonic Volcano, located less than 6 km from the crater) are rare and show an event of magnitude M 2.7 , recorded on August 16 at 13:45 UTC, at a depth of 13 km.
In this period, the fumaroles emitted by the Sabancaya are constantly remained at the level of the crater, according to the satellite data, temperatures have shown an increase since the last week of July 2016.
The steam fumaroles (whitish) continue to be predominant. Sporadically bluish coloration emissions appear (magmatic gases).
Height: no major changes were observed during this period. The fumaroles emissions have reached up to 1800 meters above the base of the crater, approximately.
Abnormalities of SO2:
The satellite system « EOS Aura » GSDM-NASA (http://so2.gsfc.nasa.gov/) shows no significant value of the density of SO2.
He was found two new sites where intense fumaroles are issued on the Northwest and North sides of the Sabancaya. The site « fumarole 1 » which covers an area of 50x20m, is located at 5,600 meters above sea level, at a distance of 900m to the northeast of the crater. The site « fumarole 2″, which has a 100x30m area is located at 5,700 meters and 750 meters of the crater to the northwest. The site « Fumarole 1 » began to be visible starting from August 2014, while the site « fumarole 2 » became apparent in May, 2016.
Both fumaroles generally showed a moderate increase in their intensity in recent weeks.
Source : IGP.
Photos : Losviajesdeali , B Bernard .
Sinabung , Indonésia :
I am quoting Claude Grandpey in his infolave of Friday, August 26:
Infolave of Friday, August 26, 2016.
The Sinabung experiencing new intense eruptive activity, with ash plumes that have now reached an altitude of 6 km. The color of the air alert was raised to the Red ..
Pyroclastic flows were also observed. They raced down the mountainside over 4 km following the previous trajectories, which represented a threat to several villages including Bakerah, Simacem, Sukanalu, Sigaranggarang and Kutagunggung. When the dome collapsed, incandescent avalanches could reach a distance of 7 km from the main crater.
Authorities have distributed thousands of masks to people affected by the eruption, and the army began to order people to leave the red zone.
The source of the intense current activity is probably the viscous lava lobe level that overflowed the crater via a steep ravine. This lobe has become too unstable and is in the process of collapsing.
According to the VAAC Darwin, satellite images indicate that the ash from the volcano has now dissipated. No new eruptive activity was reported ..
Since August 24, seismicity has evolved, with increasing numbers of earthquakes Type Hybrids, which accompanied an increase in lava volume in the dome. This one now exceeds 2.6 million cubic meters. (Source culturevolcans)
Source : Infolave / C Grandpey.
Photo : Endro Lewa
Cleveland, Alaska :
52°49’20 » N 169°56’42 » W,
Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Low-level unrest has persisted at Cleveland Volcano throughout the past week. Weather conditions at the volcano have been cloudy for much of the week, limiting satellite and web camera observations. Minor degassing from the summit was observed in web camera images on August 24. A network data outage occurred over 19-22 August, limiting local observations, but data streams were fully restored Monday morning (August 22). There has been no significant activity detected in seismic or infrasound (pressure sensor) data over the past week.
Source : AVO
Photo : Lopez, Taryn
Sotara , Colombia :
Subject: Weekly activity Bulletin of the Sotara volcano.
The level of activity is continuing: to the activity level Amarillo or (III): changes in the behavior of the volcanic activity.
Analysis and evaluation of information obtained by the Sotara volcano monitoring network. The SERVICIO Geologico COLOMBIANO – Observatory Volcanogical and Seismological of Popayan reports:
Seismic activity has been characterized by low levels in the number of events as recorded in the energy of these.
The monitoring network of the deformation of the volcano Sotara presented a stable behavior.
No surface activity or morphological changes in the images obtained during the week with the webcam installed on the Cerro Crespo were observed.
Therefore, it is concluded that during the volcano evaluation period, this one presented a stable behavior.
The Colombian Geological Service continues to oversee the evolution of the volcanic phenomenon and report timely to the changes that may occur.
Source : SGC