November 16, 2015. EN. Bromo, Marapi, Sabancaya .

Home / blog georges Vitton / November 16, 2015. EN. Bromo, Marapi, Sabancaya .

November 16, 2015. EN. Bromo, Marapi, Sabancaya .

November 16, 2015.

 

Bromo, Indonésia :

My friend Oystein Lund Andersen returned from Mount Bromo, and shares some photos on his blog (http://www.oysteinlundandersen.com/bromo-and-the-tengger-caldera/2015-october/) .

Activity of the Volcano

This was my 5th visit this year. Activity in bromo has increased in 2015, compared to 2014. Gas emissions, especially sulphur outputs have increased in 2015. A constant rumbling sound could be heard during my visit to the crater on the 19th October, caused by what seems to be, intense gas pressure.  The result of a increase of sulphur emissions can clearly be seen in the crater area (see photos from 19th October), where the sulphur emissions have colored the volcanic soil with a coat of yellow/green. A strong smell of Sulphur is often noticable as far as the village of Cemara Lowang and downwind in the villages East of the Tengger Caldera.

 

bromo

Here is above a photograph taken by me on September 18th 2015. I had also been surprised by the roar emitted during the release of gas .

Almost at the same place on October 19, below.

 

Bromo

 Already this year, the GVP had published an article:

PVMBG reported that during 1 March-13 July white plumes from Tengger Caldera’s Bromo cone rose as high as 100 m above the crater, and a sulfur dioxide odor was periodically noted at the Bromo observation post. Seismicity was dominated by tremor, but also included volcanic earthquakes. The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were warned not to approach the crater within a radius of 1 km.

 

Source : Oystein Lund Andersen , GVP.

Photos : Oystein Lund Andersen, Georges Vitton.

 

Marapi, Indonesia :

 

Authorities in West Sumatra have raised the alert level of Mount Marapi after the volatile volcano began spewing clouds of hot ash late on Saturday.
Pyroclastic clouds over the volcano’s dome were first spotted at 10.33 p.m. on Saturday, officials from the Marapi observation post told local media. The activity continued well into Sunday morning.

 

The same post also reported a series of minor seismic quakes.
The eruption is considered fairly minor but authorities have issued a warning to locals and hikers to stay beyond a three-kilometer radius from Marapi’s crater.

Authorities also elevated the mountain’s status to the second highest alert level.
The volcano registered a similar eruption on April 13.

 

Gunung Marapi, not to be confused with the better-known Merapi volcano on Java, is Sumatra’s most active volcano. This massive complex stratovolcano rises 2000 m above the Bukittinggi plain in the Padang Highlands. A broad summit contains multiple partially overlapping summit craters constructed within the small 1.4-km-wide Bancah caldera. The summit craters are located along an ENE-WSW line, with volcanism migrating to the west. More than 50 eruptions, typically consisting of small-to-moderate explosive activity, have been recorded since the end of the 18th century; no lava flows outside the summit craters have been reported in historical time.

 

Source : The Jakarta Post, GVP

Photos : Pascal Blondé,

 

 Sabancaya, Peru :

 

Arequipa, Nov. 11

The Sabancaya recorded during the week of 2 to 8 November minor emissions of water vapor and gas that reached heights of up to 1400 meters above the top of the mountain, said the Observatorio Vulcanológico del Instituto Geológico, y Minero Metalúrgico (INGEMMET).
According to the monitoring of these issues, they have mainly moved to the East-North-East.
It was also reported that long period earthquakes have occurred, LP (associated with the movement of volcanic fluids), followed by volcano tectonic earthquakes, VT (associated with the rupture of the rocks in the volcano) of moderate energy. Sporadically also hybrid earthquakes HYB (possibly associated with the ascent of magma) were recorded.

 

 

Del 2 al 9 de noviembre, la actividad del volcán Sabancaya muestra incremento.

It was also noted that the system Mirova did not report thermal anomalies on the Sabancaya.
Monitoring by EDM and GPS techniques indicates that no changes were detected in the deformation of the volcano.
The SO2 flux produced by the Sabancaya, recorded by the mobile station DOAS remain moderate in the last days.
Monitoring the hot thermal spring « SA3«  shows changes in chemical composition, indicating that the hydrothermal system is disturbed by the movement of magmatic fluids.
For these reasons, experts of the INGEMMET recommend at the authorities to implement preparedness actions to improve the reactivity of the population living near the volcano against any increase in the activity of Sabancaya.
They also suggest people to stay constantly informed of the progress of the activity of the volcano.

 

 

Source : INGEMMET

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