August 04, 2015. English . Raung, Yellowstone , Cotopaxi .

Home / blog georges Vitton / August 04, 2015. English . Raung, Yellowstone , Cotopaxi .

August 04, 2015. English . Raung, Yellowstone , Cotopaxi .

August 04, 2015.


Raung, Indonesia :

The eruption continues. Ash emissions have decreased, while satellite-detected heat emission increased during the past days.


This could suggest that activity is now more effusive (lava flows) than explosive (ash emissions) in style.
This morning, an ash plume rose approx. 1 km above the volcano and drifted 100 km to the SW. Indonesia’s Volcanological Survey VSI mentioned yesterday that seismic activity rapidly decreased.



Whether this means a near ending of the eruption remains to be seen.

Source : T Pfeiffer

Photos : Oystein Lund Andersen , Modis .



Yellowstone, United States  :

44°25’48 » N 110°40’12 » W,
Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN


The Yellowstone Volcanological Observatory ( YVO) is an observatory that reports the  VERY  low activity of Yellowstone. As such, it publishes a monthly press release which has a value equal to any other observatory communication. And as such, it is published here.



During July 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 66 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 2.2 on July 11, at 06:09 PM MDT, located about 13 miles north northwest of Lake, WY.

July seismicity included an earthquake swarm occurring on July 29th, 10 miles south southeast from West Yellowstone, MT, accounting for 14 earthquakes (ranging in magnitude from 0.2 to 1.9). The largest swarm event was a small earthquake of magnitude 1.9 on July 29, at 03:14 AM MDT.
Yellowstone earthquake activity in July remains at low background levels.



Ground deformation

GPS stations in Yellowstone continue to show little or no ground deformation. See for example: (click on Static Plots / Time Series)

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.


Source : YVO.


Cotopaxi , Ecuador :

In the last 24 hours the internal activity of Cotopaxi is moderate, as shown the seismicity and sulfur dioxide emissions. The volcano has been discovered in the afternoon and yesterday morning, demonstrating the presence of a gas plume rising less than 100 m above the crater.


In the last 24 hours, 32 long period events (LP) and 10 episodes of tremor of low amplitude (TR) were recorded.

From 7:00 to 5:00 p.m. yesterday, were recorded through the DOAS instruments the issuance of 1294t / d of SO2, average value obtained from 46 measurements.

Observations, emissions and ash:
In the afternoon yesterday, the volcano remained clear and steam emissions were observed in the crater. During the morning, it was possible to see slight pulsating vapor emissions not exceeding 100 m above the crater and were dispersed to the west.

No rains were not recorded.


Source : IGEPN

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