April 17 , 2017. EN. Poas , Turrialba , Reventador , Bogoslof .

Home / Alaska / April 17 , 2017. EN. Poas , Turrialba , Reventador , Bogoslof .

April 17 , 2017. EN. Poas , Turrialba , Reventador , Bogoslof .

April 17 , 2017.

Poas , Costa Rica :

Poas Volcano Activity Report, 16 April 2017, updated at 11:00

Over the last 24 hours, Poas Volcano has exhibited a tremor of varying amplitude, which increased in amplitude as the day progressed. Frequent small short-term water eruptions have been recorded by seismographs. On average, they are recorded between 2 and 3 eruptions per hour. The major eruptions took place between noon and 3 pm and 6:45 pm on April 15th.

 

In the last hours of April 16, the tremor became spasmodic with moderate to high amplitudes accompanied by small eruptions. Of these, the most important is the 9:46 eruption which lasted about. 10 minutes whose height is unknown due to high clouds. No ash falls have been reported. The prevailing wind was prevailing towards the Southwest and the cloud cover on the summit. In the present conditions of the Poas volcano, it is possible that other larger eruptions will occur in the short term.
From April 10 to 13, IMO / NASA instruments detected a large cloud of volcanic sulfur dioxide gas, SO2, emitted by the Poas volcano between the lower and upper troposphere, at an altitude between 3000 and 6000 meters.

Source : Ovsicori

Photo : Javier Pacheco.

 

Turrialba , Costa Rica :

Activity report of the Turrialba volcano, 16 April 2017, updated at 11:00

The Turrialba volcano remains with a discontinuous signal of volcanic tremor of low to moderate amplitude, tending towards passive time intervals of longer duration and a moderate degassing. Persistence of low frequency (LP) discrete volcanic earthquakes with medium to high amplitudes. In general, the volcano remained with a persistent but passive ashless degassing. The height of the gas and aerosol plume can not be estimated due to the dense fog conditions at the top of the volcano this morning.

 

OVSICORI-A remains vigilant on volcanic activity and will publish periodic reports on the evolution of its behavior and at each important changes.

Source : Ovsicori

 

Reventador , Ecuador :

Reventador Volcano Activity Bulletin, Sunday April 16, 2017

  SUMMARY OF THE VOLCANIC ACTIVITY:
The volcano maintains its strong activity. Yesterday afternoon it was discovered and an emission of steam and ash was observed in the West. In the morning it was cloudy.

TECHNICAL APPENDIX AND OBSERVATIONS

Seismicity:
Since 11:00 am (TL) yesterday until 11:00 am (TL) today, 10 episodes of tremor harmonic (TRA), 21 events long period (LP) and 42 explosions (EXP) were recorded.
Observations, emissions and ash:
Yesterday afternoon, a moderate steam emission with a moderate ash load was observed, less than 1 km in a westerly direction. Since the morning, the volcano remains covered. .
Rains and lahars:
There were no rains.

 

GENERAL INFORMATIONS

This report on a daily basis will be published at 12:00 (TL). In the event of an increase or a change in the behavior of the volcano, it will be immediately published a special report.

 

Source : IGEPN

Photo : Hosteria

Bogoslof , Aleutians , 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

An increase in earthquake activity from Bogoslof was detected from stations on nearby islands starting April 15 around 15:01 AKST / 23:01 UTC and subsided a few hours later. At this time there has been no evidence of renewed eruptive activity from infrasound, lightning, or satellite data. Similar sequences of earthquakes have preceded some of the explosive events during the ongoing unrest. Because this uptick in seismicity increases the likelihood of future explosive activity, AVO raised the Aviation Color Code for Bogoslof to ORANGE and the Volcano Alert Level to WATCH.


Bogoslof Volcano seen from the M/V Miss Alyssa during attempted hydrophone deployment. Steam from the crater is seen in the center of the image.

Bogoslof volcano remains at a heightened state of unrest and in an unpredictable condition. Activity may ramp back up with additional explosions producing high-altitude (>15,000 ft) volcanic clouds with little precursory activity. 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 is typically a lag of tens of minutes until we can characterize the magnitude of the event and the altitude of the volcanic cloud. It is possible for low-level unrest, including explosive activity, to occur that we are unable to detect with existing data sources. Such low-level periods of unrest and possible explosions could pose a hazard in the immediate vicinity of the volcano. .

Source : AVO

Photo: Read, Cyrus, 7 avril 2017 12h20

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