August 12 , 2017. EN. Piton de la Fournaise , Bogoslof , Tupungatito , Taupo .

Home / Alaska / August 12 , 2017. EN. Piton de la Fournaise , Bogoslof , Tupungatito , Taupo .

August 12 , 2017. EN. Piton de la Fournaise , Bogoslof , Tupungatito , Taupo .

August 12 , 2017.


Piton de la Fournaise , La Réunion :

Activity Bulletin of Friday, August 11, 2017 at 14:30 (Local time).

The eruption begun on July 14 at 00:50 local time continues. Volcanic tremor (surface eruptive indicator) has increased slightly over the past 24 hours but remains at a low intensity level (Figure 1).


Figure 1: Evolution of RSAM (volcanic tremor and eruption intensity indicator) between 00:00 (20h UTC) on July 14th and 14h30 (10h30 UTC) on August 11th on the seismic station of RVL, located on the flank South of the volcano. (© OVPF / IPGP)

– A volcano-tectonic earthquake was recorded under the summit craters during yesterday’s day.
– A slight inflation (swelling) of the entire terminal cone of the volcano is always observed (<1 cm since the beginning of the eruption).


L’image contient peut-être : nuit

Only small projections of lava are visible at the level of the small mouth that remained active on the northern flank of the eruptive vent. No casting was visible this day from the OVPF and OVPF / IRT webcams.

Most of the activity occurring in the lava tunnel, no estimate of flow could be made on this day.


Source : OVPF

Photo : S Michel ( 23/07)


Bogoslof , Alaska :

53°55’38 » N 168°2’4″ W,
Summit Elevation 492 ft (150 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Following nearly a month of quiet, Bogoslof erupted again on Monday, August 7th, as detected in seismic, infrasound, lightning, and satellite data. The eruption began at about 10:00 AM AKDT (18:00 UTC) and continued through about 13:00 AKDT (21:00 UTC), producing an ash cloud to at least 32,000 feet. Satellite measurements of sulfur dioxide (SO2) in the eruption cloud indicated the second highest mass erupted since the onset of the eruption in December 2016. Satellite images of the island taken on August 8th show new tephra deposits have surrounded the vent area, forming a new crater lake, and extending the north shore of the island another 820 feet (250 meters).



AVO Image

Worldview true color satellite image of Bogoslof volcano collected on August 8, 2017, a day after a 3-hour-long explosive eruption. Ash fall deposits have greatly expanded the island towards the north as the result of the eruption and forming a crater lake. Note that at the time of this satellite overpass, the level of the crater lake is below sea level. Previous events such as these (that formed a shallow crater lake) formed a deep crater that was subsequently filled by the influx of ocean water. Vigorous steaming is observed from the likely site of the initial explosive event in mid-December 2016. Sediment coming from erosion of the island is seen in the ocean. Data provided under the Digital Globe NextView License

AVO Image

For comparison, the satellite image of 23:13 UTC on 12 June 2017.

No additional eruptive activity has been observed since Monday, but renewed activity could occur at any time and may include additional explosive events and/or effusion of a lava dome. Volcanic explosions producing high-altitude (>15,000 ft asl) volcanic clouds with little or no warning remain possible. Some previous explosions have been preceded by an increase in earthquake activity that allowed for short-term forecasts of imminent significant explosive activity. Although we are able to detect energetic explosive activity in real-time, there can be a lag of tens of minutes until we can characterize the magnitude of the event and the altitude of the volcanic cloud.

Source : AVO

Photo : Schneider, Dave , 8 Aout 2017 , 12:00 AM


Tupungatito , Chile :

Special report on volcanic activity (REAV),
Metropolitana Region August 11, 2017 04:00 hours (local time).

The National Service for Geology and Mining (Sernageomin) publishes the following information obtained from the monitoring teams of the National Volcanic Monitoring Network, processed and analyzed at the Southern Andes Volcanological Observatory:

Yesterday, on Friday, August 11, 2017, between 03:06 local time (07:06 GMT) and 04:00 local time (08:00 GMT), monitoring stations installed near the Tupungatito volcano recorded a seismic swarm of forty-two (42) volcano tectonic events (seismicity associated with rock fracturing). The swarm began with an event of local magnitude equal to M4.1, located 8.6 km to the west (O) of the main crater. Similarly, there were 3 events of magnitude M2.7, M2.7 and M2.9 located in the same sector.

The localization obtained was as follows:

Original time: 03:06 hours local time (07:06 GMT)
Latitude: 33 ° 22’19 « South
Longitude: 69 ° 55’01 « West
Depth: 10, 3 KM
Local magnitude: M4,1


Résultat de recherche d'images pour "Tupungatito"

At the time of publication of this report, events with similar, but smaller, characteristics continue to be recorded. There is no information from the authorities or the community in general on perceptions in neighboring areas.
The volcanic technical warning remains at the green level.
The Sernageomin continues with on-line monitoring, and will report in a timely manner on possible changes in volcanic activity in the region.

Source : Sernageomin

Photo :


Taupo , New Zealand :

Taupo mildly shaken by earthquakes overnight.

Published: Wed Aug 9 2017 9:30 AM

Around 11 pm last night a small sequence of earthquakes occurred north of Taupo, concentrated in the Wairakei Geothermal Field. They were widely felt in Taupo. Small earthquakes are common in the Rotorua-Taupo area, known as the Taupo Volcanic Zone.



Earthquake locations in the last year (313), month (22) and week (6) near Taupo.

The residents of Taupo often feel small earthquakes and last night’s were no different. The two larger events, 5 minutes apart, were widely felt locally. The earthquakes were small (M2.2 and 2.1), shallow and located to the north Taupo. 125 people reported feeling the first one and 245 the second one. Small earthquakes are very common in this area and tend to cluster about the Wairakei-Tauhara and Rotokawa geothermal areas. Some also occur out in the lake area.

Résultat de recherche d'images pour "taupo nouvelle zélande"

In the last week GeoNet has located 6 events in this area, while in the last month there has been 22 locatable earthquakes and 313 in the last year. All of them are shallow, less than 10 km deep.

Taupo, like Rotorua, Reporoa, Ngakuru and Turangi, lie within the area called the Taupo Volcanic Zone. This is an area where many large caldera volcanoes and geothermal systems are present and is also an area where small earthquakes are frequent.

Source : Geonet

Photos : Geonet , Reflectim.

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