December 20, 2015. EN. Piton de la Fournaise , Popocatepetl , Masaya .

Home / blog georges Vitton / December 20, 2015. EN. Piton de la Fournaise , Popocatepetl , Masaya .

December 20, 2015. EN. Piton de la Fournaise , Popocatepetl , Masaya .

December 20, 2015.



Piton de la Fournaise, La Réunion :


Activity Bulletin Tuesday, December 15, 2015 at 12:00 (Local Time)
  Update on the situation:

On October 31, 2015 after a little more than 67 days of activity, the eruption that began on August 24, 2015 at 18:50 stopped in his effusive phase.
The OVPF has, over the following days, recorded numerous geophysical and geochemical events reflecting a continuation « non-effusive » in activity of the volcano
On 17 November 2015, the Prefecture of La Reunion said the official end of the eruption and the return to the vigilance phase.

The OVPF recorded 322 volcano tectonic earthquakes (Fig. 1) from the end of the effusive stage including 77 since the return to alertness.




Figure 1: Illustration of seismicity since 1 November 2015.


 Figure 2: Illustration of the deformation. Are shown here two base lines (distance between two GPS) at the top (left) and the base of the summit cone (right).

Regarding the strain measurements, the OVPF recorded since the end of the effusive phase as a first step a relatively quick recovery in inflation and, since the end of November a stop inflation.


Regarding the gas flow, the OVPF also records since the end of November relatively low flows.
Conclusion: Since the beginning of December, the Volcano Observatory observed a return to calm of the Piton de la Fournaise. Given the eruptive history of the volcano, we do know that the situation can change at any time.

Source : OVPF

Photo : Fournaise info ( archives)


Popocatepetl, Mexique :

December 19, 11:00 h (December 19, 17:00 GMT)

In the last 24 hours the seismic records of the monitoring system at Popocatepetl volcano registered 18 low-intensity exhalations. Aditionally, one explosion was recorded at 19h48 . It generated a small plume of steam, gases and small amounts of ash which the winds dispersed towards the east.



During the evening and night a continuos faint emission of steam and gases was observed being dispersed eastwards . From dawn and up to the time of this report the same emission has been observed but moving westwards .

CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .
This type of activity is included within the scenarios Volcanic Traffic Light Yellow Phase 2.

Source : Cenapred .

Photo : Cristobal Garciaferro fotografia


Masaya, Nicaragua :

The crater Santiago , of the Masaya volcano  continues to record small gas explosions, which are felt by the rangers of the volcano as the sounds of strong « waves » .
The seismic amplitude in real time (RSAM) of the volcano remains low to moderate between 70 and 1540 units.
At present, this activity does not represent the greatest danger to the population.


Masaya is one of Nicaragua’s most unusual and most active volcanoes. It lies within the massive Pleistocene Las Sierras pyroclastic shield volcano and is a broad, 6 x 11 km basaltic caldera with steep-sided walls up to 300 m high. The caldera is filled on its NW end by more than a dozen vents that erupted along a circular, 4-km-diameter fracture system. The twin volcanoes of Nindirí and Masaya, the source of historical eruptions, were constructed at the southern end of the fracture system and contain multiple summit craters, including the currently active Santiago crater. A major basaltic plinian tephra erupted from Masaya about 6500 years ago. Historical lava flows cover much of the caldera floor and have confined a lake to the far eastern end of the caldera. A lava flow from the 1670 eruption overtopped the north caldera rim. Masaya has been frequently active since the time of the Spanish Conquistadors, when an active lava lake prompted attempts to extract the volcano’s molten « gold. » Periods of long-term vigorous gas emission at roughly quarter-century intervals cause health hazards and crop damage.


Source : Ineter, Gvp.

Photo : Thisfabtreck

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