January 11 , 2018 .
Kadovar, Papua New-Guinea :
Elevation 365 m
The first confirmed historical eruption at Kadovar began around mid-day local time on 5 January, according to witnesses. The island is approximately 1.4 km in diameter with very steep slopes, located about 25 km NNE from the mouth of the Sepik River on the New Guinea mainland. The Rabaul Volcanological Observatory (RVO) warned of potential explosive activity, landslides, and resulting possible tsunamis.
Aerial photos and observations from Samaritan Air flights showed dark gray ash and steam plumes rising from a crater on the SE side of the summit. It was estimated that up to 60% of the island was covered in volcanic products, which primarily appeared to be ash along with some pyroclastic flows. Ashfall was reported on Kairiru and Mushu islands (115 km WNW), Mt. Uru in Yangoru (130 km W), and Woginara (140 km W), along with locations along the W coast of the Wewak District.
The NOAA/CIMSS Volcanic Cloud Monitoring system generated an alert for the ash cloud moving WNW, as imaged by S-NPP VIIRS at 0330 UTC on 5 January; Himawari-8 imagery subsequently showed that the eruption began around 0220 UTC. The Darwin VAAC issued a sequence of ash advisories starting on 5 January that noted ash moving W at an altitude of about 2.1 km (7,000 ft) a.s.l., and set the Aviation Color Code to Orange. Both discrete eruptions and continuous ongoing activity was seen in satellite imagery through 9 January, with the plume visible at distances of over 200 km W and WNW.
Although initial news reports regarding the population and evacuation status were unclear, the East Sepik Governor, Allan Bird, told media on 8 January that 591 residents of Kadovar had been evacuated to Blup Blup island (about 10 km N) due to the organizational efforts of village councilors on the two islands.
The RVO said that from 7 to 8 January, ashes continued to be issued and dispersed tens of kilometers to the west.
Two members of the Rabaul Volcanological Observatory were sent to Kadovar to install seismometric sensors. Others are expected to conduct an inspection overflight of Kadovar Island.
Sources: GVP , Centre consultatif sur les cendres volcaniques de Darwin (VAAC), Observatoire du volcan Rabaul (OVR), Boucle, Institut coopératif de la NOAA pour les études de satellites météorologiques
Nevado del Ruiz , Colombia :
Subject: Bulletin of activity of the Nevado del Ruiz volcano.
The level of activity continues at the level: Yellow activity level or (III): changes in the behavior of volcanic activity.
With regard to monitoring the activity of the Nevado del Ruiz volcano, the COLOMBIAN GEOLOGICAL SERVICE informs that:
During the last week, the various monitoring parameters show that the Nevado del Ruiz volcano continues to display unstable behavior.
The seismicity caused by the fracturing of the rocks that make up the volcano showed a slight increase in the number of earthquakes and released seismic energy compared to the previous week.
The increase in seismic activity, on 4 January, was highlighted, located 3 km north of Arenas crater, at depths between 4 and 6 km. During this increase, the largest earthquake of the last week was recorded, with a value of 2.1 ML (Local Magnitude), at 08:37 (local time), located 3.1 km to the North The other active sources during the last week were the Arenas crater and the North, Northeast, Southeast and Southwest zones, with depths of between 1.1 and 7.7 km away.
The seismic activity associated with fluid dynamics in the channels of the volcanic structure decreased both by the number of recorded earthquakes and the released seismic energy, compared to the previous week. This type of activity is characterized mainly by the occurrence of multiple fluid earthquakes, long periods and very long periods, as well as tremor impulses. The earthquakes were located mainly in the vicinity of the Arenas crater and in the south-east and south areas of the volcano.
The volcanic deformation measured from electronic inclinometers, Global Navigation Satellite System (GNSS) stations and radar images, show a stability behavior without recording any significant deformation process of the volcanic structure.
The volcano continues to emit water vapor and gases into the atmosphere, among which the sulfur dioxide (SO2) is distinguished, as evidenced by the values obtained by the SCANDOAS stations installed on the volcano and the analysis satellite images. In tracking the information provided by the MIROVA and NASA FIRMS portals, several thermal anomalies were recorded in the vicinity of the Arenas crater.
The column of gas and steam reached a maximum height of 800 m measured at the top of the volcano, January 7. The direction of the dispersion of the column was governed by the direction of the wind in the area, which during the week predominated to the northwest and southwest relative to the crater Arenas.
The Nevado del Ruiz volcano continues at the level of yellow activity.
Source : SGC
Sinabung , Indonesia :
Activity Level of level IV (AWAS). The Sinabung (2460 m altitude) since yesterday until this morning was often covered with fog. The smoke rising from the crater, during the periods when the volcano was discovered, could be observed rising from 50 to 500 m above the volcano. The wind is blowing moderately to the east. Thanks to the recording of the seismographs of January 10, 2018, 3 eruption / emission events were recorded with ash columns rising at altitudes of 700 to 1500 m above the ridges. Finally, 60 avalanche events with slip distances of 500 to 1500 m were recorded on the South, South – East and East slopes.
Communities / visitors should not do activities within 3 km of the summit, and by sector, 7 km to the South-South-East, 6 km East-South-East and 4 km to the South-East. km northeast.
The deposits formed a dam upstream on the Laborus River. People living in downstream river basins and around the Laborus River need to be vigilant because these dams can collapse at any time and no longer retain water volume, resulting in downstream lahars / floods .
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA.
Issued: January 11 , 2018.
Volcano: Sinabung (261080)
Current Aviation Colour Code: ORANGE
Previous Aviation Colour Code: orange
Source: Sinabung Volcano Observatory
Notice Number: 2018SIN29
Volcano Location: N 03 deg 10 min 12 sec E 98 deg 23 min 31 sec
Area: North Sumatra, Indonesia
Summit Elevation: 7872 FT (2460 M)
Volcanic Activity Summary:
Eruption with ash clouds at 03:02 UTC (10:02 local time). The eruption lasted for 290 seconds.
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 12032 FT (3760 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information:
Ash cloud is moving to west
Seismic activity is characterized by the Deep Volcanic Earthquake, Low Frequency Earthquake, and Hybrid Earthquake.
Source : VSI , Magma .
Photos : Endro Lewa , Firdaus Surbakti / Beidar Sinabung.
Popocatépetl , Mexico :
January 10, 11:00 am (January 10th, 17:00 GMT)
During the last 24 hours, thanks to the monitoring systems of the Popocatepetl volcano, 301 low intensity exhalations accompanied by steam, gas and sometimes small amounts of ash have been identified. Two more explosions were recorded yesterday at 12:35 and 12:49.
In addition, 342 minutes of low-amplitude harmonic tremors and eleven volcano-tectonic earthquakes of magnitude between M1.3 and M3.0 were recorded, which occurred yesterday at 23:39 h.
At the time of this report, a slight emission of water vapor and other gases that disperse in the South-South-West direction is observed.
CENAPRED asked not to approach the volcano and in particular the crater, because of the risk of falling of projectiles, and in case of heavy rain to stay away from the bottoms of the ravines, following the danger of landslides and flows of mud.
The Popocatepetl volcanic warning light is located at Amarillo Phase 2.
Source : Cenapred.
Photo : Cristobal Garciaferro ( archives)