February 03, 2017 . EN . Nevado Del Ruiz , Piton de la Fournaise , Kilauea , Ruapehu, White Island,
February 03 , 2017.
Nevado Del Ruiz , Colombia :
Subject: Activity level of the volcano Nevado del Ruiz.
The level of activity continues:at level of activity yellow or (III): changes in the behavior of volcanic activity.
Regarding the monitoring of the activity of the volcano Nevado del Ruiz, the Colombian Geological Survey reports that:
During the week, various monitoring parameters show that the volcano Nevado del Ruiz remains unstable.
Seismic activity related to fracturing of volcanic rock under the volcano showed decreased earthquakes, but the seismic energy levels released were similar to those recorded the previous week immediately. This seismicity was located mainly in the North, South-South-East, South-West , North-East Sources and, to a lesser extent, in the Arenas Crater and in the Northeast and Southeast sources. Depths of earthquakes varying between 0.3 and 7.8 km. The maximum magnitude recorded during the week was 2.3 ML (local magnitude), corresponding to a mark on 24 January at 04h34 (local time) earthquake, 2.4 km deep, located at 2.3 Km south-south-east of the Arenas crater.
Seismicity related to fluid dynamics in ducts of the volcanic structure has been characterized by the appearance of earthquakes, with varying levels of energy, long period (LP) and very long period (VLP) type, Tremor pulses and multiple fluid earthquakes. This type of seismicity retained the same tendency to both the number and the seismic energy released, observed during the previous week. The earthquakes were mainly located in the Arenas crater, in the south-eastern of the volcano and to a lesser extent in the northern part of the area. Some of these seismic signals have been associated with the emission of gas and ash into the atmosphere, as confirmed from images captured by the cameras installed in the volcano region and reports from officials of the Los Nevados National Natural Park (Pnnn) . The recording of such seismic signals is not excluded with higher energy levels which may be associated with the emission of gas and ash. It is important to remember that ash emission processes can occur for several days and sometimes several times a day, without involving the individual report of each episode.
Volcanic deformation, measured from electronic inclinometers, Global Navigation Satellite Systems (GNSS) and satellite images to determine changes in inclination, position and shape of the volcano, continues to record over the last few decades Months a deflationary process and intermittent inflation / deflation impulses possibly related to the emission of gas and ash.
The volcano continues to emit significant amounts of water vapor and gas, including sulfur dioxide (SO2), as evidenced by the values obtained by the SCANDOAS stations installed in the field of analysis of the volcano and on the satellite image. In the tracking information provided by the Mirova site, several low-energy thermal anomalies were identified, most of which were recorded on January 24 with a value of 9.0 MW.
The column of gas, steam and ash from time to time reached a maximum height of 900 m measured on the top of the volcano on 24 January. The direction of the dispersion of the column was in line with the dominant wind regime in the area, which prevailed during the week southwest of the volcano.
The volcano Nevado del Ruiz continues the Amarillo activity level.
Source : SGC
Photos : Archives
Piton de la Fournaise , La Réunion :
The eruption begun on January 31, 2017 at 7:40 pm local time continues. The volcanic tremor (indicator of surface eruptive intensity) remains at an average level (about half that observed at the beginning of the eruption), with less fluctuations in the last 8 hours compared to the first 24 hours (Figure 1) .
Figure 1: Evolution of the RSAM (volcanic tremor and eruption intensity indicator) between 7:00 am (1:00 am UTC) on January 31 and 4:00 pm (12:00 pm UTC) on February 2 on the seismic station of Château Fort, located on the Southern flank of the volcano. (© OVPF / IPGP)
– No significant deformation was recorded during the day on the terminal cone.
– No seismicity was recorded during the day under the Piton de la Fournaise volcano.
– The CO2 concentrations in the soil at the Volcanic Gite remain at high values.
The observations and observations made this morning by the observatory allowed:
– Shooting thermal images. Outlet temperatures at the vent are between 1200 and 1250 ° C (Figure 2).
Figure 2: Thermal images of the eruptive site taken in aerial view on 02/02/2017, 8:45 local time (left and middle) and on the ground on 01/02/2017, 10:00 local time. (© OVPF / IPGP)
– Monitoring the edification of the eruptive cone. The eruptive cone continues its edification. A main fountain is at the origin of the construction of a southern wall more prominent than the north wall. A second lava fountain is always visible (Figure 3).
Figure 3: Shooting of the eruptive site on 02/02/2017 at 09:20, local time. (© OVPF / IPGP)
– The approximate layout of lava flows. Compared to yesterday, lava flows increased 500m to the east (Figure 4).
Figure 4: Approximate plot of lava flows on 02/02/2017, 9:20 local time, deduced from aerial images (IGN background map). (© OVPF / IPGP)
Surface flows estimated from satellite data via the HOTVOLC (OPGC – Clermont Ferrand) and MIROVA (Turin University) platforms range from 3 m3 / s to 7 m3 / s
Source : OVPF
Kilauea , Hawai :
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Issued: Thursday, February 2, 2017, 10:05 AM HST
Source: Hawaiian Volcano Observatory
Notice Number: 2017/H27
Location: N 19 deg 25 min W 155 deg 17 min
Elevation: 4091 ft (1247 m)
Volcanic Activity Summary: Sea Cliff at Kamokuna Ocean Entry Highly Unstable
Kīlauea Volcano’s episode 61g lava flow is still active and entering the ocean at Kamokuna on the volcano’s south coast. Recent observations of the ocean entry indicate growing instability of the adjacent sea cliff. Potential collapse of the cliff poses an extreme danger to anyone in the closed area on land, as well as to boats near the ocean entry.
On January 25, HVO geologists noted an extensive crack running parallel to the sea cliff about 5 – 10 m (16 – 33 ft) behind the stream of lava at the Kamokuna ocean entry. Ground inspection of this crack by HVO geologists on January 28 showed 30 cm (about 1 foot) of separation across the crack. Four days later, on February 1, this crack had widened to about 70 cm (2.5 feet). The seaward block bounded by this crack was visibly moving up to 1 cm (about 1/2 inch), possibly in response to explosions below the ocean entry as hot lava mixed with cool ocean water. In addition, ground shaking could be felt up to several hundred meters (yards) away.
These observations show that this portion of the sea cliff is highly unstable and could collapse into the ocean with no warning.
Sudden collapse into the ocean of a slab of sea cliff about 28 m (90 ft) high and about 150 m (490 ft) or more in length would create a significant wave that would travel rapidly out to sea. It would also could shower the immediate area with blocks of hot rock and fragments of molten lava. It could also prompt more powerful explosions as the 61g lava tube is further exposed.
HVO continues to monitor the situation and will issue further updates as new information becomes available. Photographs of this crack and activity at the ocean entry can be found on our web site: https://hvo.wr.usgs.gov/multimedia/
Source : HVO
Ruapehu , White Island, New Zealand :
Busy time for the volcano team
Like everyone else the volcano team has been waiting on summer to arrive, so they can catch up on or complete a few outstanding tasks. Last week summer called by for a couple of days and the team visited White Island (Whakaari), completed a gas flight around Ruapehu and visited the Crater Lake at Mt Ruapehu.
As part of the monitoring at Mt Ruapehu we attempt to sample the Crater Lake about once a month. This allows us to collect water and gas samples and confirm the temperatures from the data logger probe in the lake. The lake was successfully sampled last Saturday. The lake appeared a uniform grey colour as it has on past samplings. This indicates there is some convection (mixing) occurring in the lake as the gases and hot fluids enter it. The lake was overflowing, which is normal for the lake and varies little. The temperature of the Crater Lake is currently around 21 °C and is slowly cooling. A gas flight was also completed on the 24th. The results from this flight indicate low-moderate amounts of volcanic gas continue to come through the lake. The Volcanic Alert Level for Ruapehu remains at Level 1 (minor volcanic unrest).
White Island (Whakaari):
Meanwhile a visit was also made to White Island on the 27th. We visit the island to make many measurements, this trip was to collect gas and water samples, observe the activity from the active crater and make a soil gas survey. The gas chemists collect gas from the hottest accessibly fumaroles (steam vents).
Fumarole #1 is currently the hottest and the team measured 191 °C while sampling it. Basically the same temperature as the previous trip. The activity from the vent in the active crater was also unchanged. The crater floor remains ‘dry’, only a few small ponds and springs are present. The crater lake has not reformed since the eruptions in April and September last year. The soil gas survey measures the CO2 gas leaking from the Main Crater floor.
We make measurements at 61 sites. There has been an increase from the measurements in November 2016, some of this is related to the dryer conditions on the island. The Volcanic Alert Level for White Island remains at Level 1 (minor volcanic unrest).
Source : Geonet