April 19 , 2017. EN. San Miguel , Manam , Piton de la Fournaise , San Cristobal .

Home / blog georges Vitton / April 19 , 2017. EN. San Miguel , Manam , Piton de la Fournaise , San Cristobal .

April 19 , 2017. EN. San Miguel , Manam , Piton de la Fournaise , San Cristobal .

April 19 , 2017.

San Miguel ( Chaparrastique ) , El Salvador :

Between 06:20 and 18:30 on Monday 17 April, the Chaparrastic volcano in San Miguel experienced a sudden increase in its internal seismic vibration, reaching 356 RSAM units over a period of 10 minutes (graph).

In recent days, there has been a slight increase in the internal seismic vibrations of the volcano, but also also increased the degassing of the crater. This type of activity has been recorded on the Chaparrastic Volcano in recent years. Sometimes, celat ended with emissions of ash.

Graphic. In the last hours, the seismic vibrations showed an increase in its values.


These variations are associated with a movement of fluids under the crater, a typical situation in an active volcano.
Given the behavior recorded over the last few days, the exit of magma and / or ash is not excluded from the central crater or from the flanks of the volcano

The MARN is continuing its improved monitoring of the volcano, in close communication with the Directorate General of Civil Protection and local observers.
The ministry calls the population to stay away from the top of the volcano because of the degree of danger it presents.

Update of 18/04

In the past 24 hours, the Chaparrastic volcano in San Miguel has continued to record changes in its internal seismic vibration, fluctuating between 80 and 294 units on average per hour. The normal value shall be considered as 50 units.

In recent days, there has been a slight increase in the internal seismic vibration of the volcano, but also an increase in the degassing of the crater. The images captured by the surveillance camera located on the Pacayal volcano showed nebulosities in the volcano area, but it was sometimes possible to observe slight pulses of gas emanating from the central crater. The network of local observers did not release any material from the crater


Source : Marn.

Manam , Papua New Guinea :

Manam volcano erupts

17 APRIL 2017. THE volcano on Manam Island in Bogia, Madang in Papua New Guine , erupted on Sunday evening, forcing many who had moved back there fleeing for safety, the local newspaper reports.
Paul Maburau, the ward councillor for Dugulava village on the island, said they saw flames coming out at around 7pm when many villagers were preparing to have dinner.
He said fire was coming out of both craters of the volcano – the one between Bokure village and Kualang village, and the one between Dugulava and Warisi villages.
Maburau said more blasts came during the night and continued through yesterday.


“Every time there was a blast, the ground would shake,” he said. The place is very dark with the smoke from the volcano. “We are taking refuge where we think is safe.”
He said some had left the island on the three available dinghies at Dugulava. “Many of us left behind are now confused and scared of what will happen next,” Maburau said.
The provincial disaster office confirmed receiving the report from the island and would make plans to assess the situation today and assist the people.

Manam Island is about 16km northeast of Bogia. Maburau said the people needed to be evacuated but fuel was the problem.
People from seven village in Giri confirmed seeing fire and smoke from Manam Island. “The volcano is now giving off dust and soon all our gardens will be spoiled,” Maburau said. “This is my biggest fear because we will starve again.”
It is one of Papua New Guinea’s most active volcanoes. A series of eruptions began at Manam in November and December 2004. It forced mass evacuations. A pyroclastic flow from the volcano on December 3, 1996, killed 13 people in the village of Budua.


The 10-km-wide island of Manam, lying 13 km off the northern coast of mainland Papua New Guinea, is one of the country’s most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1807-m-high basaltic-andesitic stratovolcano to its lower flanks. These « avalanche valleys » channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five small satellitic centers are located near the island’s shoreline on the northern, southern, and western sides. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during much of the past century into the SE valley. Frequent historical eruptions, typically of mild-to-moderate scale, have been recorded since 1616. Occasional larger eruptions have produced pyroclastic flows and lava flows that reached flat-lying coastal areas and entered the sea, sometimes impacting populated areas.

Source : GVP , ONE PNG

Photos : Archives

Piton de la Fournaise , La Réunion :

Activity Bulletin of Tuesday, April 18, 2017

Following a lull observed since the beginning of last March, the inflation (inflation) of the building has resumed in recent days, but at a relatively low rate compared to those observed in 2015, 2016 and early 2017 (elongation Of 0.1-0.2 mm per day between stations in the summit zone compared to 0.5-1 mm during previous inflation periods;


Figure 1: Illustration of the deformation in the last twelve months (eruptions of 26-27 May, 11-18 September 2016 and 31 January – 27 February 2017 are shown in yellow). Here is shown a baseline (distance between two GPS receivers) crossing the Dolomieu crater from north to south (in black the raw data, in blue the smoothed data over a week). A rise is synonymous with elongation and therefore swelling of the volcano; Conversely, a decrease is synonymous with contraction and therefore with deflation of the volcano. (© OVPF / IPGP)


This resumption of inflation is accompanied by a slight seismicity. Thus,
– 22 superficial volcano-tectonic earthquakes were recorded under the summit craters (0-2 km deep) between 01 and 17 April 2017 (10 of them for the single day of 14 April).
– During the same period two deep earthquakes were also recorded under the east flank of the volcano (2-3 km below sea level).
At the same time, the CO2 concentrations in the soil measured on the western flank of the volcano (at the level of the volcano deposit and at the Plains of Cafres) show an upward trend.

Source : OVPF

Photo : F Leveneur ( archives)

San Cristobal , Nicaragua :

An earthquake of magnitude M3.4 on the Richter scale shook the volcano San Cristobal in northwestern Nicaragua, without causing casualties or damage, officials said.

The earthquake was recorded at 10:41 local time (16:41 GMT) and its epicenter was located 17 kilometers north of the San Cristobal volcano in the department of Chinandega, explained the Institute of Territorial Studies of Nicaragua (INET) in a report.
The earthquake occurred at a depth of 2.4 kilometers, and was caused by an event related to local faults in the volcanic chain of Nicaragua, said the INET seismologist, Petronila Flores.


The authorities of Nicaragua did not report any casualties or damage caused by the earthquake.

The San Cristobal, 1,745 meters high, is Nicaragua’s highest volcano, and is located in the Nicaraguan « volcanic cordillera », made up of 13 cones on the Pacific coast of this Central American country.


Source : Elnuevodiario.

Photo : Archive 2015

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