Actividade Vulcânica 2017

Tópico em 'Sismologia e Vulcanismo' iniciado por luismeteo3 4 Jan 2017 às 13:41.

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  1. luismeteo3

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    Dr Janine Krippner‏Conta verificada
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    3/n On 28 November 2017 the eruption produced an ash column reaching 4000 m above the peak. On November 29, 2017 the eruption produced an ash column height reaching 2000 m above the peak.

    2/n After the eruption, the next eruption occurred again on November 25, 2017 at 17:20 WITA with an ash plume height of 1500 m above the peak. On 26 and 27 November 2017 eruptions occurred with the ash column height reaching 3000 m above the peak.


    1/n * Monitoring Data Analysis *
    -Visual-
    After undergoing a volcanic earthquake swarm over the period Sept-Oct 2017, finally on 21 November 2017 at 17:05 WITA the phase of eruption of Mount Agung evolved to produce volcanic ash as high as 700 m above the peak.
     
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  2. luismeteo3

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    8/n Continuous tremors with amplitudes over the background level, until overscale (beyond the capability of recording devices) continue to be recorded since November 28, 2017 to today (December 1, 2017). This indicates a high intensity of activity near the surface.


    7/n This happens because the magma path to the surface is now more open. Therefore, although the number is not much, but it does not mean that volcanic activity has subsided.

    6/n
    - Seismicity -
    Earthquakes are still dominated by the occurrence of deep and shallow volcanic earthquakes. This indicates that there is still magma movement at depth. Currently the number of volcanic earthquakes is no longer as much as the period September-October 2017.
     
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  3. luismeteo3

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    11/n
    ... whereas that GPS showed inflation of the body of Mount Agung [slight outward moving of the volcanic flanks] since August 2017 until mid-September 2017.




    10/n - Deformation -
    GPS measurement results do not record a clear pattern of inflation ahead of the eruption. This is different from the pattern shown by GPS prior to the occurrence of swarms (sequence of volcanic earthquakes) in the period September-October 2017...


    9/n Low-frequency earthquakes are recorded several times and this is related to the movement of Magmatic fluid to the surface.
     
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  4. luismeteo3

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    14/n
    ... Based on the results of this laboratory test, it can be concluded that the first eruption of Gunung Agung was phreatomagmatic. This eruption can occur when the new magma interacts with water in the aquifer system under the crater of Mount Agung.



    13/n - Geochemistry -
    Lab test results of the volcanic ash produced by the opening eruption on November 21, 2017 show the existence of juvenile content (new magma material). Within the ash, older material from the 1963 eruption was also identified...



    12/n The pattern shown by the tiltmeter measurements is in the form of inflation before eruption and deflation after eruption takes place.
    [tiltmeter general info here: https://earthquake.usgs.gov/monitoring/deformation/data/instruments.php …]
     
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  5. luismeteo3

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    18/n
    Satellite data also indicate that the effusive eruption (lava flow to the surface) is still occurring within the crater.



    17/n - Remote Sensing Satellite -

    Satellite data consistently records hotspots [higher heat output] on 27, 28 and 29 November 2017 with temperatures ranging from 286.6-298.8 +/- 6 degrees Celsius, with a maximum power of 97 megawatts.



    16/n
    ... the concentration of SO2 gas is still consistently measured. Higher concentrations of SO2 was observed over the period of 26-27 November 2017, after which, the concentration of SO2 relatively decreased.



    15/n
    Prior to the Nov 21, 2017 eruption, CO2 gas could be measured at high concentrations by the MultiGAS equipment flown by Drone. However, the SO2 gas concentration was not yet measurable. After the Nov 21, 2017 eruption, to this day...
     
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  6. luismeteo3

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    21/n
    Therefore, the status of Agung is still at Level IV (Awas). Communities around Agung and climbers/visitors/travelers are urged to NOT climb Agung and not to engage in any activity within the Danger Zone...


    20/n * Conclusions*
    Based on multi-parameter data analysis, it can be concluded that until now (December 1, 2017) volcanic activity of Agung is still high and still in the phase of eruption.
     
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  7. luismeteo3

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    23/n
    It is still safe to travel in Bali as long as you do not enter the above Danger Zone.

    Ministry of ESDM
    Geological Agency of Volcanology and Geological

    Hazard Mitigation
    -- END--


    22/n
    ... within the area of the Agung crater and in all areas within a radius of 8 km from the Agung crater, plus the sectoral expansion to the North-Northeast and Southeast-South-Southwest out to 10 km from the Crater of Mount Agung.



    21/n
    Therefore, the status of Agung is still at Level IV (Awas). Communities around Agung and climbers/visitors/travelers are urged to NOT climb Agung and not to engage in any activity within the Danger Zone...
     
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  8. luismeteo3

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  9. luismeteo3

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  10. luismeteo3

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    Slow increase in earthquake activity in Öræfajökull volcano
    Posted on December 1, 2017 by Jón Frímann
    There seems to be a slow increase in earthquake activity in Öræfajökull volcano. For the last 48 hours the number seems to be rising. This is how it looks on this graph from Icelandic Met Office.


    This increase in earthquake activity suggest that more magma is pushing up the volcano at faster rate. The main idea now is that the magma that is pushing up Öræfajökull volcano is rhyolite in nature and that seems to be confirmed to an extent by the earthquake activity as it now appearing.

    How this develops is a big question due to lack of accurate historical accounts. What is known about the eruption in 1362 was written down up to two centuries later and when that happens lack of accuracy is passed into the written record. The written record for the eruption in 1727 – 1728 is slightly better but is far from being accurate.

    http://www.jonfr.com/volcano/?p=7208&cpage=1#comment-75037
     
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  11. luismeteo3

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  12. luismeteo3

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    12.33pm: Mount Agung one-third filled with scorching magma, PVMBG warns

    Indonesia’s PVMBG has warned that seismic activity ripping through the volcano suggests magma is pushing towards the crater.

    Gede Suantika, head of the PVMBG, said: “We calculate it based on the monitoring results of Himawari satellite images of seismic recording data, deformation and geochemistry.”

    The findings suggest that dangerous lava is filling the volcano, threatening to reach a “critical phase”.

    Experts are warning that an “imminent eruption” is at hand and that the hot lava "will certainly spill over to the slopes”.

    12.18pm: Volcanic activity spikes as magma rises through Mount Agung

    The Center for Volcanology and Geological Hazard Mitigation (PVMBG) recorded intense tremors rocking the volatile volcano on Saturday.

    The PVMBG said: "The continuous quake for 22 minutes at 14.34 to 14.56 Indonesian Central Time indicates the addition of magma supply to the crater wall continues.

    "This continuous earthquake happens almost every day, or has been going on six times since November 28, 2017.”
     
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  13. luismeteo3

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    11.22am: Mount Dukono eruption puts Indonesia on alert

    As Mount Agung continues to spew dark ash into the skies, a new threat has emerged on the Indonesian island of Halmahera.

    A notice issued by the Volcanic Ash Advisory Center Darwin (VAAC) has warned that the spewing Dukono volcano is erupting on the island.

    VAAC said in a statement: “Volcanic ash unidentifiable on satellite imagery due to met cloud and darkness, however, volcanic ash still expected in area.

    “Height and movement based on consensus model guidance.”

    Ash cloud maps issued by VAAC forecast the ash cloud to head east towards the island’s east coast.
     
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