October 23 , 2015. EN. Cotopaxi, Sheveluch , Piton de la Fournaise .

Home / blog georges Vitton / October 23 , 2015. EN. Cotopaxi, Sheveluch , Piton de la Fournaise .

October 23 , 2015. EN. Cotopaxi, Sheveluch , Piton de la Fournaise .

October 23 , 2015.



Cotopaxi, Equateur :

During the last week, the activity of the volcano Cotopaxi was characterized by the sporadic presence of seismic signals related to emissions, called tremor of emission, and the generation of volcano tectonic earthquakes (VT) who have had an average of 50 ~ events / day. The amplitudes of VT events are generally less than M 1  , but some events were recorded with an amplitude of M 2.7 , on 14 October. The emission tremor was characterized by low to moderate amplitude and duration between 1 and 12 hours. The energy associated with the activity experienced a slight increase in the second to third week of October. Most VT events are located under the crater, less than 12 km deep. In addition, there have been other types of events, such as hybrid and very low frequency events (VLPs). A typical day of seismic recording took place on October 17 in which were recorded 11 hours of tremor of emission followed by several  VT type events.


Locating events volcano Cotopaxi 2015. October 1 to 16 The vast majority of localized events correspond to the volcano tectonic earthquakes Type VT (blue triangles) and some type LP (pink circles). All events are located around and beneath the crater at depths below 12 km (although most are less than 9 km).

SO2 emissions:
The values of the flow of SO2 obtained by the permanent network DOAS show variations. Between October 07-09, these values were about 1,400 tons / day. Then between 10 and 12 October an increase in the concentration of the gas rising between 4100 to 7600 tonnes / day. Since October 13, the flow is in the approximately 1500 tons / day.

Dispersion and ash fall:
From 08 October to present, there have been reports of fall of fine light ash in the WestSouthwest (San Ramon, San Agustin de Callo) and Barrancas, on the evening of October 16. Ash falls were reported in Rumipamba and Vallecito in Canton Rumiñahui on October 17. On Sunday, October 18th ashes were spread in the west of the volcano.




Visual observations:
Because of cloudy weather during the last week, it was rarely possible to see the summit of the volcano and its emissions. A columns were lightly to moderately loaded view ash up to 1.5 km above the summit. However, on October 19 in the morning there was sufficient visibility to observe a column of at least 1.5 kilometers high, seen from a camera from the cable car.


Source : IGEPN

Photo : José Luis Espinosa Naranjo.



Sheveluch , Kamchatka :


Shiveluch Volcano in Russia’s Far East sends plumes of ash up to 6km into sky – TASS21 OCTOBER 2015. Shiveluch Volcano on Russia’s Far Eastern Kamchatka Peninsula has spewed a plume of ash to a height of 4.5 kilometres above sea level. « Seismic stations nearby Shiveluch have registered that the giant volcano sent a plume of ash up to six kilometres into the sky today [October 22], » a spokesperson for the Kamchatka branch of the Russian Academy of Sciences’ Geophysical Service told TASS on Thursday.


« However, video surveillance has failed due to a heavy snowstorm in the Ust-Kamchatka district, » he said. Along with this, Kamchatka’s department of the Russian Emergencies Ministry said that populated localities had not suffered from ash falls.Earlier, TASS cited the Klyuchevskaya volcano observatory of the Far Eastern branch of the Russian Academy of Sciences as saying that Shiveluch had been demonstrating increased activity in recent days as fire avalanches were going from the lava dome down up to 0.5-1km along the volcano slopes towards the Baidarnaya and Bekesh rivers.


Source : TASS

Photo :   Y.Demyanchuk / Volkstat.ru



Piton de la Fournaise , La Réunion :

Activity Bulletin Thursday, October 22, 2015 at 17:30 (Local Time)

During the day the OVPF recorded a slight upward trend of the tremor present since the end of the effusive eruption phase (see bulletin of 19 October).


Moreover, an independent observer reported observing projections of lava associated with small explosions inside the vent. These projections seem related to the percolation of gas through a layer of further liquid lava located in sub-surface.

All these observations confirm that although the effusive activity of Piton de la Fournaise is currently stopped, the eruption does not mean complete.

Seismic activity:
Since this morning around 8:00 am on October 22, 2015, we have witnessed a gradual increase in the intensity of the tremor which, for the record, has continuously been present since the end of the effusive phase of Sunday 19 to 8:02.
  Since 12:00 , the level of the recorded tremor has doubled. But it is still 40 times less intense than during the eruption.



No significant deformation was recorded.
Volcanic gas flow:
An isolated burst of SO2 was recorded at 10:00 this morning.



Second phase of the effusive eruption in progress.

From 19:30 on October 22, the Volcanological Observatory recorded a strong and progressive increase in the tremor, witnessed a resumption of the transfer of magmatic fluids to the surface. To 10:45 p.m., the volcano observatory was confirmed by the image of the Piton de Bert camera the resumption of surface lava flows.

On the morning of October 23 at 6:30 am the weather on the top of the Piton de la Fournaise is mixed (alternating passages sunny and fog) making the observation of the eruption uncertain . As before the activity is concentrated near the crater Rivals.

To recall, in eruptive phase and no major change in the activity or in the recorded signals, the transmission frequency of detailed bulletins from the observatory is one by week.


Source : OVPF

Photo : Mamz’l Ha

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