02/06/2015. Shindake, Yellowstone , Krakatau .

02/06/2015. Shindake, Yellowstone , Krakatau .
02/06/2015.

Shindake, Ile Kuchinoerabujima, Japan :

The level of alert Eruption 5 (evacuation) continues:

In the island of Kuchinoerabujima, the state of increased volcanic activity continued. Before yesterday (May 31) and yesterday (June 1st), the investigation team of the Japan Meteorological Agency (JMA-MOT) conducted aerial surveys in cooperation with the Regional Development State Office. During the observation of 31, part of the mountain was in the clouds, but it was confirmed discoloration of an area of trees on the northwest slope of Shindake. Observation of yesterday, showed no significant changes compared to the crater observation of the previous eruption (March 25) .It also has a possibility there that an eruption of the same degree is occur in the future.

shindake

Analysis of the samples show ash fragments of altered rocks (~ 60%). Because the ashes contained a slightly magmatic substance (~ 30%), The eruption is considered to be phreato-magmatic. The ratio of the latter has increased compared to the ejecta of 3 August 2014.

Source : Sherine France / data.jma.go.jp
Photo : JMA

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

Seismicity

During May 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 75 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 3.0 on May 18, at 5:00 PM MDT, located about 3 miles north northeast of Lake, YNP. The event was felt within Yellowstone National Park.

No earthquake swarm activity was present during May.

Yellowstone earthquake activity in May remained at low background levels.

Ground deformation

GPS stations in the caldera (and north of the caldera) exhibit minimal movement either up or down at this time. An example can be found at:

http://www.unavco.org/instrumentation/networks/status/pbo/data/HVWY (click on Static Plots / Time Series)

yellowstone

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.

For memory : http://volcanoes.usgs.gov/volcanoes/yellowstone/faqs_misconceptions.html

Source : YVO
Photo : huffingtonpost.com

Krakatau , Indonesia :

6.102 ° S, 105,423 ° E
Elevation 813 m

PVMBG reported that during 22 April-25 May diffuse white plumes rose 25 m above Anak Krakatau, although foggy weather often prevented observations. Seismicity was high during May, and continued to be dominated by shallow and deep volcanic earthquakes, and signals indicating emissions.

krakatau 172

The Alert Level remained at 2 (on a scale of 1-4). Residents and visitors were warned not to approach the volcano within 1 km of the crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi , GVP.
Photo : G Vitton .

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