June 07 , 2016. EN. Bromo , Mauna Loa , Ruapehu , Pavlof .
June 07 , 2016.
Bromo , Indonesia :
Spotlight on the Bromo, through the news that we reported our friend Oystein Lund Andersen on site.
The latest eruptive phase of Bromo started in December 2015. The eruptive activity was in the beginning dominated by the ejection of ash and lapili. In late January and February the activity increased and larger explosions were seem, sometimes accompanied by the ejection of lava-bombs/blocks, loud eruption/rumbling sounds and shock-waves. In this period there were also days when strong crater-glow was seen above the crater at night.
The eruptive activity had a short period of rest between the end of February until the end of March. During this period the activity was dominated by degassing but no ash-venting/eruptions.
The Indonesian Volcanology Survey (PVMBG) noted a increase in seismic activity in the first week of April, that was followed by new eruptive activity. Ash-venting and crater-glow was observed. The ash-output was lower than February/March levels. Eruption/rumbling sounds was also present, but lower than january/February levels.
During the second week of April, the activity decreased again and only weak to moderate degassing plumes was observed during until first week of May.
The last week of May the activity increased again, and resumed eruptive activity similar to the activity observed in April.
Note: The eruptive phase is still ongoing.
My 31th trip to Bromo, never get tired of traveling there, especially when there is eruptive activity.
On arrival on the 3th June, Bromo was erupting steady column of ash, that rose to heights between 200-500m, and drifting West toward the city of Malang. Late evening the eruption ceased and the volcano was seen only emitting steam in the morning/midday of 4th June. During this period of calm a period of degassing started, and emitted a body of sulfur gas that could be easily recognized by the nose several kilometers from the volcano.
In the afternoon of the 4th, the volcano had again started to erupt. During a visit to the crater area in the afternoon, the volcano was erupting ash, but the sound of moving/ejected rocks were also very evidently heard from the crater edge. Some rocks were also seen ejected from the crater, however did only reach 20-30m above the bottom of the crater, and did not make it over the crater edge. On the morning of the 5th June the volcano was quiet again, and only a small degassing plume could be seen, and even sometimes faded and the volcano was totally calm
Source et photos : Oystein Lund Andersen :
The entirety of the splendid photo here:
Mauna Loa , Hawai :
19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
6 JUNE 2016. A sudden swarm of earthquakes on the rift of Mauna Loa caught the attention of scientists with the USGS Hawaiian Volcano Observatory last week. The small earthquake swarm occurred beneath Mauna Loa’s west flank from Saturday, May 28 through Tuesday, May 31. The USGS reported that most of the earthquakes occurred at depths between 3 to 5 miles below the surface. The largest quake was a magnitude 2.8.
“This activity is part of the expected range of behaviors for Mauna Loa and does not represent a significant change,” USGS wrote in a June 2 update. “Seismicity rates have since decreased, though are nonetheless elevated above the long-term background.”
This map shows horizontal velocities measured with GPS from 2004 to 2005, a period of rapid motion similar to 2014-2015. The arrows represent the speed (proportional to length) and direction of motion at both continuously recording and survey GPS stations on Mauna Loa. The ellipses at the arrow tips provide information about the uncertainty associated with the measurements. The pattern results from inflation of a complex magma reservoir beneath Mauna Loa’s summit area.
Scientist-in-charge Tina Neal told Sherry bracken during a June 3 interview that the event was a reminder that the world’s largest volcano is in a period of unrest.
In addition, measurements continue to show deformation related to inflation of a magma reservoir beneath the Mauna Loa summit and upper Southwest Rift Zone, with inflation recently occurring mainly in the southwestern part of the magma storage complex.
Mauna Loa is not erupting. A small earthquake swarm occurred beneath Mauna Loa’s west flank from Saturday, May 28 through Tuesday, May 31. Most of the earthquakes occurred at depths between 5-8 km (3-5 mi) below the surface and the largest event was a magnitude 2.8. This activity is part of the expected range of behaviors for Mauna Loa and does not represent a significant change. Seismicity rates have since decreased, though are nonetheless elevated above the long-term background. Global Positioning System (GPS) measurements continue to show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone, with inflation recently occurring mainly in the southwestern part of the magma storage complex.
Source : BIG ISLAND VIDEO NOUVELLES , GVP .
Ruapehu , New Zealand :
Volcanic Alert Level 2 (no change)
Aviation Colour Code: Yellow (no change)
14:00 pm Tuesday 7 June 2016
Mt Ruapehu remains in a state of heightened volcanic unrest. The temperature of the summit Crater Lake has declined from 46 ºC and is now 32 ºC. Moderate levels of volcanic tremor continue. Further gas measurements and water samples were collected last week from the lake. The Volcanic Alert Level remains at Level 2 (moderate to heightened unrest). The Aviation Colour Code is also unchanged, at Yellow.
Recent visits to the volcano have confirmed the output of volcanic gas (carbon dioxide CO2, hydrogen sulphide H2S and sulphur dioxide SO2) remains elevated above background levels but is declining. The lake temperature reached a high of 46 ºC on May 11 then the lake started to cool, declining to 30 ºC by June 2. Since then it has risen to the current temperature of 32 ºC. Water samples have been collected from the Crater Lake for chemical analysis. Moderate to low levels of volcanic tremor continue.
Data available at present indicates volcanic unrest continues at Mt Ruapehu. The volcanic alert level for Mt Ruapehu is Volcanic Alert Level 2 (moderate to heightened unrest). The Aviation Colour Code is Yellow. GNS Science volcanologists continue to closely monitor Ruapehu through the GeoNet project.
Source : Geonet.
Pavlof , Alaska :
55°25’2″ N 161°53’37 » W,
Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Seismicity remains low at Pavlof Volcano. No activity was observed in mostly cloudy satellite and web camera images.
A spectacular view to the northeast of the Pavlof eruption taken at 20,000 feet, by our friends at the U.S. Coast Guard. Lieutenant Commander Nahshon Almandmoss
Pauses in activity of days to weeks are common during eruptive episodes of Pavlof Volcano. A return to 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 : Almandmoss, Nahshon