February 09 , 2017. EN. Takawangha , Piton de la Fournaise , Nevado Del Ruiz , Pacaya , Mauna Loa .
February 09 , 2017.
Takawangha , Alaska :
Current Volcano Alert Level: NORMAL
Previous Volcano Alert Level: ADVISORY
Current Aviation Color Code: GREEN
Previous Aviation Color Code: YELLOW
Issued: Wednesday, February 8, 2017, 11:13 AM AKST
Source: Alaska Volcano Observatory
Location: N 51 deg 52 min W 178 deg 1 min
Elevation: 4754 ft (1449 m)
Volcanic Activity Summary: The energetic earthquake swarm on Tanaga Island that began on January 23, 2017, has declined significantly and seismicity is near background levels. Therefore, AVO is lowering the Aviation Color Code to GREEN and Alert Level to NORMAL for Takawangha volcano.
Remarks: Takawangha is a remote, 1,449 m (4,754 ft)-high stratovolcano located on the northeast portion of Tanaga Island, roughly 95 km (59 miles) west of Adak in the Andreanof Islands. Takawangha’s summit is mostly ice-covered, except for four young craters that have erupted ash and lava flows in the last few thousand years. Parts of Takawangha’s edifice are hydrothermally altered and may be unstable, possibly leading to localized debris avalanches from its flanks. Takawangha lies across a saddle from historically active Tanaga volcano to the west. No historical eruptions are known from Takawangha; however, field work shows that recent eruptions have occurred and it is possible that historic eruptions attributed to Tanaga may instead have come from Takawangha.
Source : HVO
Photo : Coombs, M. L.
Piton de la Fournaise , La Réunion :
The eruption begun on January 31, 2017 at 7:40 pm local time continues. Volcanic tremor (an indicator of surface eruptive intensity) is maintained at a high level of intensity comparable to that seen at the beginning of the eruption (Figure 1, attention: the higher values recorded over the last 24 hours may be influenced by Wind and rain disrupting signals).
Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between January 31st and February 8th (5pm local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)
– No seismicity was recorded during the day under the Piton de la Fournaise .
– With regard to long-term deformations, the trend towards a slight upturn in the inflation of the volcano seems to be clear. This parameter will be followed and confirmed in the next few days.
Due to bad weather, no ground or aerial reconnaissance was carried out today by the volcanological observatory. The large cloud cover still present on the massif, did not allow the estimate of surface flow.
On the other hand, the COSMO-SkyMed radar satellite imagery (realized by the OI2 platform – OPGC Clermont Ferrand) made it possible to carry out a mapping of the flow as it was at 07 February (Figure 2). This technology and the applied treatment make it possible to identify the surfaces newly covered by the flows and to get rid of the presence of clouds. On the other hand, the resolution of the rendered contours is less than that of the treatments applied in aerial photographs. The length of the lava flows has reached an extension of the order of 2.8 km and is located in the heights of the « Grandes Pentes ».
A survey conducted this morning by the air section of the gendarmerie and the PGHM confirms the position of the front of the flow in this sector on February 08.
Outline of the flow on 07/02/2017, deduced from the COSMO-SkyMed radar satellite images (Base map: IGN). (© OVPF / IPGP)
A short-lived lull in weather conditions around 1:35 am TU (05:35 local time) allowed a visual feedback on the webcams, and to always confirm the presence of a single eruptive vent (Figure 3 ).
Nevado Del Ruiz , Colombia :
The Colombian Geological Survey reports to authorities and the community on February 4, 2017, at 1:06 pm (local time), indicate that an seismic signal with energy level similar to other significant events reported in recent weeks has been registered.
It was connected to the flow of fluids inside the volcano Nevado del Ruiz. This signal was eventually associated with an emission of gases and ash into the atmosphere, but given the weather conditions in the area, this could not be confirmed by the surveillance webcams.
Ash falls can occur on populations that are in the direction of the wind regime, which is currently mainly on the northwest volcano (NW), as on Manizales, Villamaría and Chinchiná.
Pacaya , Guatemala :
Activity type: strombolian.
Morphology: Stratovolcan composite
Geographical location: 14 ° 22’50˝ Latitude N; 90 ° 36’00˝ Longitude W.
Weather conditions: Partly Cloudy
Wind: North 5 km / h Precipitation: 0.0 mm.
Constant white and blue degassing activity culminating at a height of about 3,100 meters (10,170 feet), spreading southward. The seismic station PCG shows the tremor which is the product of the ascent of the magma and gases found in the crater. In the hours of the night and early in the morning, incandescent pulses of 5 to 25 m high that are reflected and shining in the crater are observed.
Source : Insivumeh
Photo : Archive
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
Mauna Loa is not erupting. Rates of deformation and seismicity have not changed significantly in the past week and continue to be above long-term background levels. No significant change in summit fumarole temperature was noted over the past week.
During the past week, small-magnitude (up to magnitude 3.0) earthquakes continued, primarily beneath the upper Southwest Rift Zone and the Northeast Rift zone at depths less than 5 km (3 miles). A small number of earthquakes also occurred on the west flank of the volcano at depths above 13 km (8 miles).
Global Positioning System (GPS) measurements continue to show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone.
Measurements from a continuously-monitored fumarole site within the summit caldera showed an increase in temperature during the first half of January, however, relatively steady fumarole temperatures were measured over the past week. No significant change in either sulfur dioxide or carbon dioxide concentrations was measured in the volcanic gas emissions.
Source : HVO