October 31, 2015. EN. Láscar, Piton de la Fournaise , Bulusan .

Home / blog georges Vitton / October 31, 2015. EN. Láscar, Piton de la Fournaise , Bulusan .

October 31, 2015. EN. Láscar, Piton de la Fournaise , Bulusan .

October 31, 2015.



Láscar, Chile :

Special volcanic activity report (REAV))
Antofagasta Region, October 30, 2015 at 09: 45 hl

The National Geology and Mining Service (SERNAGEOMIN) and the Volcanological Observatory of Southern Andes (OVDAS), communicates the following:
A 09: 32HL (12: 32GMT) via the webcam of the Lascar volcano, it was observed an emission of ash to a height of 2500 m, to the north-east flank of the volcano. The seismic signal that has accompanied this process in surface, has a reduced displacement of 1cm2, which is considered low to moderate.



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At the time of publication of this report, emissions of particulate matter have continued their evolution is evaluated.
The eruption was preceded by any warning sign, which leads him to believe that it probably has a phreatic origin. The last major eruption of the Lascar was in 2005 .

Due to the facts above, the technical level of volcanic alert goes to YELLOW.
The SERNAGEOMIN OVDAS continuous online monitoring and report timely changes in the activity of the volcano.



Láscar is the most active volcano of the northern Chilean Andes. The andesitic-to-dacitic stratovolcano contains six overlapping summit craters. Prominent lava flows descend its NW flanks. An older, higher stratovolcano 5 km E, Volcán Aguas Calientes, displays a well-developed summit crater and a probable Holocene lava flow near its summit (de Silva and Francis, 1991). Láscar consists of two major edifices; activity began at the eastern volcano and then shifted to the western cone. The largest eruption took place about 26,500 years ago, and following the eruption of the Tumbres scoria flow about 9000 years ago, activity shifted back to the eastern edifice, where three overlapping craters were formed. Frequent small-to-moderate explosive eruptions have been recorded since the mid-19th century, along with periodic larger eruptions that produced ashfall hundreds of kilometers away. The largest historical eruption took place in 1993, producing pyroclastic flows to 8.5 km NW of the summit and ashfall in Buenos Aires.


Source : Sernageomin, GVP .

Photo : aoc.nrao.edu, Darack/Alamy.



Piton de la Fournaise , La Réunion :



The 4th eruption of 2015 has resumed Thursday night after an initial phase of two months, then a timid recovery of two days. It is the third phase of this fourth effusive eruption of the year.
The activity is concentrated again at the crater that formed early in the eruption, near the Rivals crater in the southwestern part of the Enclos Fouqué.


On the morning of Saturday, October 31 at 08:00, the effusive phase continues. An activity alternating between small Strombolian explosions and lava fountain is visible at the vent newly appointed Piton Kalla and Pele.
This relatively high activity is perfectly observable from the path leading to the Piton de Bert.

Source : Fournaise info.

Photo : Olivier Grondin


Bulusan, Philippines :

This is a notice of increasing seismic activity of Bulusan Volcano (12.7667°N, 124.0500°E).

Since 5:00 AM yesterday until 12:00 noon today, a total of 38 volcanic earthquakes were recorded by the Bulusan Network, way above the background level of seismic activity. Although other monitoring parameters have remained unremarkable, the increased seismic activity may be precursory to minor steam-driven or phreatic eruptions occurring at the currently active west-northwest, northwest, southwest or summit vents, based on past behavior of the volcano.

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Alert Level 1 status is strongly reiterated over Bulusan Volcano. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden steam-driven eruptions. Civil aviation authorities must also warn pilots to avoid flying close to the volcano’s summit as ejecta from sudden eruptions may be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s activity and any new development will be relayed to all concerned.

Source : Phivolcs

Photo : kalayaanatpagibig

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