June 24 , 2017. EN. Bogoslof , Kilauea , Rincon de la Vieja , Reventador .

Home / Alaska / June 24 , 2017. EN. Bogoslof , Kilauea , Rincon de la Vieja , Reventador .

June 24 , 2017. EN. Bogoslof , Kilauea , Rincon de la Vieja , Reventador .

June 24 , 2017.


Bogoslof , Alaska :

AVO/USGS Volcanic Activity Notice

Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Issued: Friday, June 23, 2017, 5:31 PM AKDT
Source: Alaska Volcano Observatory
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians



AVO ImageTimeline of eruptive events at Bogoslof volcano associated with the formation and destruction of the first known subaerial lava dome emplaced during the 2016-17 eruption. The eruption on June 10 destroyed the lava dome that developed June 5-10 and also appears to have destroyed all remaining parts of the 1992 lava dome. The blocks strewn over the surface on the southwest part of the island are likely all that remains of these two lava domes. COSMOS SkyMed compilation by Dave Schneider, USGS-AVO. Lava dome observations from Kim Angeli, USGS. Image on right provided under the Digital Globe NextView License. Images on left courtesy of the Italian Space Agency.

Volcanic Activity Summary:
An explosion was detected in seismic and infrasound data at Bogoslof volcano beginning at 00:49 UTC, June 24 (16:49 AKDT, June 23) and lasting about 10 minutes. A small ash cloud was observed in satellite data starting at 0100 UTC.

We are evaluating the magnitude of this eruptive episode. The Aviation Color Code remains at ORANGE and the Volcano Alert Level remains at WATCH at present. We will update this report as more information becomes available.

Recent Observations:
[Volcanic cloud height] Preliminary SIGMET issued by NWS to 30,000 ft asl.
[Other volcanic cloud information] Observed in satellite beginning at 0100 UTC
[Lava flow/dome] N/A
[Lava flow] N/A

The National Weather Service Alaska Aviation Weather Unit has issued an eruption SIGMET warning for aviation up to 30,000 ft above sea level.



Bogoslof - photo du 22.06.2017 / 13h courtesy of Dave Eilertsen via AVO

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Friday, June 23, 2017, 6:20 PM AKDT


Volcanic Activity Summary:
A significant explosive eruption at Bogoslof volcano occurred at 00:49 UTC, June 24 (16:49 AKDT, June 23) and lasted about 10 minutes. The eruption produced a volcanic cloud that reached about 36,000 ft above sea level, and was accompanied by strong seismcity, lightning and infrasound. Thus, AVO is raising the Aviation Color Code to RED and Alert level to WARNING for Bogoslof volcano.

Satellite data through 1:30 UTC shows a volcanic cloud with an estimated altitude of 36,000 ft asl moving towards the northeast. Seismic and infrasound data suggest that the ash emissions are no longer continuing. The volcano is in a restless condition and additional explosive events may occur.

Recent Observations:
[Volcanic cloud height] 36,000 ft asl estimated by satellite and pilot report of cloud to 30,000 ft asl.
[Other volcanic cloud information] Cloud moving towards northeast

Hazard Analysis:
[Ashfall] Possible trace ash fall over Bering Sea northeast of the volcano

The SIGMET warning message for aviation, issued by the National Weather Service Alaska Aviation Weather Unit currently is in effect up to 36,000 ft above sea level.


Source : AVO.

Photo : Waythomas, Chris ;  Eilertsen , Dave


Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
No significant change. Kīlauea Volcano continues to erupt at the summit and at Puʻuʻōʻō vent on the East Rift Zone. The episode 61g lava flow from Puʻuʻōʻō is entering the ocean at Kamokuna. Surface flows are active above the pali, but pose no threat to nearby communities. The summit lava lake level continues to drop in concert with deflationary tilt; the lake surface is approximately 52 m (170 ft.) below the floor of Halemaʻumaʻu this morning. There have been no significant changes in seismicity levels or ground deformation trends across the volcano.


Summit Observations:
Tiltmeters at Kīlauea’s summit continued to record deflation during the past day. The lava lake level continued to drop and was measured at approximately 52 m (170 ft.) below the rim of the Overlook Vent this morning. Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering. Summit sulfur dioxide emission rates remain high.

L’image contient peut-être : nuage, ciel, océan, plein air, eau et nature

Puʻuʻōʻō Observations:
Webcam images over the past 24 hours show persistent glow at long-term sources within the crater and from a small lava pond on the west side of the crater. There were no significant changes in seismicity over the past 24 hours. The tiltmeter near Puʻuʻōʻō crater has been recording deflation since Wednesday morning, when the deflation phase of the current DI event started at the summit. The sulfur dioxide emission rate from the East Rift Zone vents has been steady over the past several months and remains significantly lower than the summit emission rate.


Thermal images collected during the overflight on Wednesday, June 21, show a hot crack spanning much of the width of the lava delta at the Kamokuna ocean entry. These cracks are common on lava deltas, and suggest sagging and instability at the front of the delta.

Lava Flow Observations:
The episode 61g flow is still active and entering the ocean at Kamokuna. The new lava delta is approximately 3.2 acres in size, extending about 100 m (328 ft.) out from the sea cliff. At Puʻuʻōʻō, flows continue on the upper portion of the flow field. These flows do not pose any threat to nearby communities at this time.

Source : HVO.

Photos : Bruce Omori , David Ford , HVO


Rincon de la Vieja , Costa Rica :

Activity report of the Rincón de la Vieja volcano.

On 23.06.2017 at 02:56 local time, an eruption is recorded on the Rincón de la Vieja volcano, with a column that peaked at 2000 meters above the crater and 3916 meters above sea level (12844.48 ft).
Duration of activity: 1 minute.


Rincon de La Vieja - éruption du 23.06.2017 / 14h56 - photo RSN

Ash reports reported in: no ash falls.
Sulfur odor reported in: No reported sulfur odor.

Comments :
The phreato-magmatic eruption produced hot water, gas and rocks that descended along the northern slope. Lahars along streams are reported on the North Slope


Source : Ovsicori

Photo : RSN


Reventador , Ecuador :

Special report on the volcano Reventador N. 1-2017
Changes in eruptive activity.

The activity recorded on the volcano Reventador has been characterized in recent months by the presence of explosions. Their average daily rate is around 50, as well as earthquakes associated with fluid circulation (LPS) with a similar value. With these explosions were observed emission columns with different heights, their maximum range is 2 km above the crater. In addition, there have been observed the descent of many pyroclastic, weak flows, which have descended on almost all sides of the volcano.


Yesterday afternoon from 17:01 (local time) it was observed the beginning of a different activity, which was characterized by the presence of a seismic signal of tremor of continuous emission, but also by a signal of  spasmodic tremor , composed of several signals as well as small explosions. Superficially, and associated with this change in seismic behavior, the presence of weak to moderate pyroclastic flows that have descended throughout the night and during the early morning hours on the northeast flank of the volcano have been recorded. They generated emissions of low-ash columns, which reached about 2.5 km and dissipated to the west.

If the direction of the wind persists, there is the possibility of very light ash falls to the south of the city of Cayambe.

The deposits of pyroclastic flows are concentrated about 4 km in the amphitheater of the volcano and part of the upper watershed of the Reventador, east of the cone of the volcano. The size of these depots is relatively large and clearly visible in the surveillance images of the cameras.
This activity has been maintained up to now, it is important to note that the material deposited in the upper reaches of the El Reventador River, with the presence of heavy rainfall, can be remobilized and generate weak to moderate lahars. Important to be cautious around this river.
The Institute will report on the progress of this process.

The photo shows this activity.


Informe Especial Reventador N. 1 - 2017

Figure 1. Pyroclastic flow down the northern flank of the Reventador volcano at 7:57 today, seen from the Copete camera, on the eastern edge of the caldera.

Source : AA, DA, PR, PC , Instituto Geofísico
Escuela Politécnica Nacional.

Photos : Juan Carlos , IGEPN

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