March 13 , 2016. EN. San Miguel , Alaid , Momotombo , Masaya , Telica , Ibu .

Home / Alaid / March 13 , 2016. EN. San Miguel , Alaid , Momotombo , Masaya , Telica , Ibu .

March 13 , 2016. EN. San Miguel , Alaid , Momotombo , Masaya , Telica , Ibu .

March 13 , 2016.

 

 

 San Miguel, El Salvador :

Special Report No. 2 – Downward trend of volcanic tremor on the volcano Chaparrastique.
Friday, 11 March 2016 11:41

Date and time of publication: 03/11/2016 10:00:00

From 8:40 p.m. Thursday, March 10, until the date of issuance of this report, the seismic vibrations of the Chaparrastique volcano showed a downward trend. In the last 24 hours, the tremor has fluctuated between 90 and 231 RSAM units on average per hour, with an average of 176 units, the maximum threshold of normal behavior RSAM value is 150 units (Figure 1).

 

Figure 1. Behaviour of seismic tremor of the volcano since December 2015.

Surveillance cameras show the upper zone of the volcano very darkened . Local observers have not reported observing surface anomalies over the volcano.

MARN continues to monitor with improved monitoring devices, maintains close communication with the General Directorate of Civil Protection and local observers.

MARN invites journalists and people not to approach the summit of the volcano, because of the degree of danger it poses.

 

chaparrastique

The symmetrical cone of San Miguel volcano, one of the most active in El Salvador, rises from near sea level to form one of the country’s most prominent landmarks. The unvegetated summit of the 2130-m-high volcano rises above slopes draped with coffee plantations. A broad, deep crater complex that has been frequently modified by historical eruptions (recorded since the early 16th century) caps the truncated summit, also known locally as Chaparrastique. Radial fissures on the flanks of the basaltic-andesitic volcano have fed a series of historical lava flows, including several erupted during the 17th-19th centuries that reached beyond the base of the volcano on the north, NE, and SE sides. The SE-flank lava flows are the largest and form broad, sparsely vegetated lava fields crossed by highways and a railroad skirting the base of the volcano. The location of flank vents has migrated higher on the edifice during historical time, and the most recent activity has consisted of minor ash eruptions from the summit crater.

Source : Marn, GVP.

Photo : M Faucher

 

Alaid , Kouriles Islands , Russia:

50.86 N, 155.56 E;
Elevation 7672 ft (2339 m)
Aviation Color Code is ORANGE

A moderate activity of the volcano continues. Ash explosions up to 19,700-26,240 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

According to visual data from Paramushir Island, a gas-steam plume containing ash extended to the south-west from the volcano on 6 March.Satellite data by KVERT showed an intensive thermal anomaly over the volcano all week, a gas-steam plume containing ash extended for about 90 km to the south-west from the volcano on 6 March.

 

alaid

The highest and northernmost volcano of the Kuril Islands, 2285-m-high Alaid is a symmetrical stratovolcano when viewed from the north, but has a 1.5-km-wide summit crater that is breached widely to the south. Alaid is the northernmost of a chain of volcanoes constructed west of the main Kuril archipelago and rises 3000 m from the floor of the Sea of Okhotsk. Numerous pyroclastic cones dot the lower flanks of basaltic to basaltic-andesite Alaid volcano, particularly on the NW and SE sides, including an offshore cone formed during the 1933-34 eruption. Strong explosive eruptions have occurred from the summit crater beginning in the 18th century. Reports of eruptions in 1770, 1789, 1821, 1829, 1843, 1848, and 1858 were considered incorrect by Gorshkov (1970). Explosive eruptions in 1790 and 1981 were among the largest in the Kuril Islands during historical time.

Photo of this volcano

A dark, ash-rich eruption column rises above Alaid volcano on April 30, 1981, at the peak of an eruption that began on April 27. The eruption plume extended 2000 km to the SE. Explosive eruptions in 1790 and 1981 were among the largest in the Kuril Islands.
Photo courtesy of Anatoli Khrenov, 1981 (Institute of Volcanology, Petropavlovsk).

 

Source : Kvert, GVP.

Photo : Sergey Golodnikov , Anatoli Khrenov.

 

Momotombo , Masaya , Telica , Nicaragua :

Danger in the craters of volcanoes Momotombo and Telica.

March 13, 2016. This weekend, 23 small explosions were recorded with ash emissions on the Momotombo volcano, on which government institutions posted keep constant vigilance.
« The ashes expelled are mounted at a height of 300 meters above the crater. The last explosion took place at 10:22 p.m. yesterday ; it is a major preoccupation, not only because it showed many emissions, but it is the greatest danger for the population, « said Rosario Murillo, coordinator of the Communication and Citizenship Council.

 



In the case of the Telica volcano, Murillo has advised tourists and the general public to avoid approaching the crater because there can be explosions ejecting fragments of ash and incandescent rocks.

Meanwhile, it was reported Saturday that two earthquakes were recorded in the caldera of the Masaya Volcano, caused by volcanic activity.
One of them was recorded on Friday at 12:20 pm with a magnitude of M 1.1, while the other was M2.4 magnitude.
Authorities said that although there is no change in the activity of the volcano, there is the possibility of other explosions in the crater and the expulsion of gases, ash and incandescent rocks.

 

masaya

« The rest of our volcanoes is in its usual state of relative calm, » said Murillo.

Regarding the three earthquakes in the country, two were recorded south of Ticuantepe, the other earthquake was located in southwestern Jiquilillo, all of mild intensity.

Source :  EL NUEVO DIARIO.

Photos : Circuit touristique Momotombo , Otto Mejia.

 

Ibu , Indonesia :

Evaluation :

Visual data show that in the period from 1 January 2016 until March 7, 2016, emission column series have fluctuated but were stable at a maximum height of 500 m. A gray / black color in the column shows that volcanic materials are brought to the surface.
Seismicity is still dominated by the emission tremors, volcanic earthquakes and earthquake of avalanche whose number fluctuates, but still in very large numbers. An harmonic tremor was recorded, fluctuating and rising in February 2016. However, its magnitude was relatively stable during this period. This indicates that the activity of Gunung Ibu is dominated by surface activity or close to the surface / shallow and shows the continued migration of magma.
The number and duration of the avalanche earthquake associated with materials deposited in the northern part of  the crater during this period is relatively stable. This indicates the absence of material accumulation.

 

ibu

The calculation of seismic amplitude (RSAM) recorded by seismic stations IBU conducted to estimate the evolution of the energy of the activity, from January 1, 2016 until March 7, 2016 is fluctuating and shows a trend to climbing since mid-late January and mid-February 2016.

Conclusion: On the basis of instrumental and visual observations and the potential danger of eruption of Mount Ibu, on March 8, 2016, the level of activity remains at Waspada (Level II). If changes, decreased / increase in volcanic activity, significantly, the Gunung Ibu activity level can be lowered / raised in accordance with the level of activity and threats. Intensive surveillance is conducted to assess the activities of Gunung Ibu, as well as for the understanding of its activity.

Source : VSI.

Photo : B Duick / Volcanodiscovery / Twitter 14.11.2014

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