July 28 , 2017. EN. Piton de la Fournaise , Nishinoshima , Sheveluch , Sinabung .
July 28 , 2017.
Piton de la Fournaise , La Réunion :
Activity report for Thursday, July 27, 2017 at 4:30 pm (Local time).
The eruption begun on July 14 at 00:50 local time continues. The intensity of the volcanic tremor (surface eruptive intensity indicator) has been maintained at a relatively steady level for the past 24 hours (Figure 1).
Figure 1: Evolution of RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 16h00 (12h00 UTC) on July 27th on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)
– No earthquakes have been recorded in the past 24 hours.
– The trend towards a slight recovery in inflation observed over the past few days on deformation sensors, in particular GPS, is confirmed.
Due to poor weather conditions, no field reconnaissance and no estimate of satellite discharges could be made today.
The comments of Objectif Volcan :
The eruptive cone reaches twenty meters at the top and contains two distinct mouths. Surprisingly, the upstream vent on the north wall of the cone did not close as expected, but it built a small rampart on the west side, which gives it a nice shape! Although some projections are issued sporadically, a pretty flame dominates the activity.
The main vent is much more active, with projections reaching between 20 and 30 meters in height and thus continuing to build the cone. The latter is completely asymmetrical, since a rampart has been rapidly constructed between the two active vents and the cone is always equouled on the other side, exactly to the south-east.
The lava is discharged directly into a tunnel (or network of tunnels) from the cone over 200 meters and then flows into a channel for a few hundred meters. Changes in eruptive flow cause resurgences and overflows at the tunnel and channel respectively, which tends to thicken the lava field rather than to advance it.
Source : OVPF, Objectif Volcan.
Photo : Laurent Perrier.
Nishinoshima , Japan :
The island of Nishinoshima still active.
Volcanic activity resumed on April 20, 2017, after almost a year and a half without eruption and during the nesting period of seabird species.
Now we have less data, but sometimes there are pictures of the eruption and satellite images where it is possible to see that the strombolian eruption continues, with lava flows reaching the sea by increasing the surface area of the island.
The island of Nishinoshima in the Ogasawara Islands in Japan erupted in November 2013 and was continuously until November 2015. The island already existed due to an eruption in 1973. After two years of eruption , The previous island was practically covered and had also increased by 12 times its original size.
Source : Avcan / Olga Rodriguez.
Sheveluch , Kamchatka :
56.64 N, 161.32 E;
Elevation 10768 ft (3283 m), the dome elevation ~8200 ft (2500 m)
Aviation Color Code is ORANGE
Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800-49,200 ft (10-15 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
A growth of the lava dome continues (a viscous lava flow reveal in the northern its part), strong fumarole activity, ash explosions, hot avalanches and an incandescence of the dome blocks and hot avalanches accompany this process. According to satellite data by KVERT, a thermal anomaly over the volcano was noting all week. Strong explosions sent ash up to 11-12 km a.s.l. on 23 July, and on 23-24 July ash plume extended for about 1400 km to the east from the volcano.
Source : Kvert
Photo : Volkstat ru
Sinabung , Indonesia :
Volcano Observatory Notice for Aviation (VONA):
Last Issued: 20170728/0232Z
Current Aviation Color Code: ORANGE
Volcanic Activity Summary:
Eruption with ash clouds at 02:26 UTC (09:26 local time). The eruption lasted for 146 seconds.
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 11072 FT (3460 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 NorthEast – Southeast
Seismic activity is characterized by the Deep Volcanic Earthquake, Low Frequency Earthquake, and Hybrid Earthquake. Rock avalanche (Incandescent lava) is not identified.
G.Sinabung’s level of activity remains at Level IV (Awas)
Community and visitors / tourists should not operate within a radius of 3 km around the summit, 7 km in the South – East sector, 6 km in the East – South – East sector, and At a distance of 4 km in the north-east sector of Sinabung. And the people who live near the rivers that spill from Sinabung must remain vigilant about the potential dangers of lahars.
The materials formed a dam upstream on the Laborus River. People who live and move around the watershed downstream must maintain vigilance because these dams can collapse at any time, resulting in downstream lahar / flooding. BPBDs Tanah Karo will immediately disaster or flood threat for people who live and move downstream along and around the Laborus River.
Source : VSI , Magma .
Photo : Beidar Sinabung.