April 08 , 2016. EN. Pavlof , Lokon-Empung , Kiebesi , Reventador .
April 08 , 2016.
Pavlof , Alaska :
Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE
Location: N 55 deg 25 min W 161 deg 53 min
Elevation: 8261 ft (2518 m)
Area: Alaska Peninsula Alaska
Volcanic Activity Summary:
The recent period of eruptive activity at Pavlof Volcano that began on March 27, 2016 has ended. Over the past week, seismicity at the volcano has remained at low levels and shows no indication of activity associated with ash emissions or lava effusion. Satellite observations show no evidence for continuing eruptive activity. Thermal signals at the summit are occasionally visible, but are likely being generated by the cooling of previously erupted lava and debris.The low levels of seismic activity and the lack of evidence for ash emissions or lava effusion indicate that the eruption has ended and thus AVO is lowering the Aviation color code and Volcano Alert Level to YELLOW/ADVISORY.
Pauses in vigorous eruptive activity of days to weeks are common during eruptive episodes of Pavlof Volcano. A return to robust eruptive activity remains possible and could occur with little or no warning. Thus, AVO will continue to monitor the volcano closely and will issue additional information as necessary.
Source : Avo.
Photo : Sigurdson, Robert ( June 7, 2013 6:02 AM)
Lokon-Empung , Indonésia :
The activity of Lokon, in the period from February 5, 2016 until March 7, 2016, visually did not indicate any abnormalities or changes to important parts of the crater. The activity is currently dominated by a strong seismic activity in bursts with gas columns that reached 200 m above the crater.
The evaluation data for the period from 5 February to 7 March 2016 can be described as follows:
Statistics show that there has been no eruption seismicity during the period from September 2015 to March 7, 2016. Volcanic earthquakes, particularly shallow (VB) increased on March 6, 2016, up to the number than 98. According to the calculations of volcanic energy, volcanic activity until 7 March showed an increase. Tremor type of events have also experienced an increase in value of maximum amplitude.
The volcanic activity of Lokon during the period from 5 February to 7 March 2016 was characterized by shallow earthquakes being recorded (VB) with numbers that fluctuate so that phreatic eruptions (steam explosion) can occur suddenly, especially during heavy rainfall.
The EMP seismogram station (Mount Empung) in the last 24 hours indicates that the recording sequence of the seismicity is dominated by volcanic earthquakes shallow waves with characteristics arrival / occurrence of earthquake more affirmed and have tend to be of greater amplitude.
Earthquakes of dominant frequencies which have been detected in the period from 24 February to 7 March 2016 are generally higher than 8 Hz (high frequency). Physically, the high frequency volcanic activity indicates a fracturing of rocks in the edifice due to increased volcanic pressure, magmatic / hydrothermal.
The deformation using the tiltmeter method (Tilting) shows changes to the Y / radial axis (crater), which indicate the inflation of the Lokon. Inflation can occur due to the increased pressure under the surface due to movements of the dynamics of magmatic / hydrothermal fluids. As for the X axis / tangential (perpendicular to the crater), it showed no significant change.
The results of the evaluation of data on visual observations, seismicity and deformation during the period from 5 February to 7 March 2016 showed that the activity of Mount Lokon has increased significantly. Therefore, the level of activity of Lokon is raised from level II (Waspada) to Level III (Siaga) from March 8, 2016 at 2:00 p.m..
Source : VSI
Photos: french.people.com.cn ( 2012 ) ,
Kiebesi , Indonesia :
Visual observations showed no change in the high gas and smoke gusts that rise beyond the walls of the crater. Gas emissions are confined on the floor of the crater as « pits solfataras« with strong smoke intensity.
Seismic recordings showed that volcanic earthquakes (VA, FL and Tremor) since the start of January 2016 saw their numbers increase until early March 2016.
The maximum duration of the vibration amplitude of Tremor increased at the beginning of March 2016, indicating a fluid flow that comes close to the surface. The presence of LF seismic events since January 2016 also indicates that the pressure / pulse of fluid from inside the body of the volcano is greater.
During the period from 1 January to 6 March 2016 the seismic activity is dominated by distant and local tectonic earthquakes. Indeed, the location of KieBesi, is located on the east side of the crest of the ridge of Mayu, where the seismicity is very high. The earthquake felt in November 2015 played a role in the increased seismic activity of the KieBesi indicated by the increase in depth of volcanic earthquakes (VA) and their low frequency (LF) in January 2016. Therefore, is necessary to pay attention to local tectonic earthquakes that can cause a rapid rise in activity.
Based on the visual and instrumental observations and potential danger of eruption, the Kiebesi activity level went from NORMAL (level I) at Waspada (Level II) from the date of March 7, 2016 10:00.
Source : VSI
Photo : Ruska Hadian, 1985 (Volcanological Survey of Indonesia).
Reventador , Ecuador :
SUMMARY OF THE ACTIVITIES OF THE VOLCANO
Continuation of the high activity of the volcano. In the morning, was observed the emission of incandescent blocks up to 1000 m below the rim of the crater on the South – East flank .
ANNEX TECHNICAL AND OBSERVATIONS
From 11:00 (TL) yesterday until 11:00 (TL) today, 34 explosions (EXP), 35 events long period (LP), 3 episodes of harmonic tremor (TA) and 6 episodes of tremor emission (TREM) were recorded.
Observations emissions and ashes:
During the morning it was observed glowing blocks fall up to 1000 meters below the crater on the South – East flank of the volcano. At the moment the volcano is quite clear.
Rain and lahars:
There was no rain in the volcano area.
This report on a daily basis will be published at 12:00 (TL). In the case of an increase or a change in the behavior of the volcano will be issued a special report immediately.
Source : IGEPN
Photo : 1freewallpapers.com .