April 06 , 2017. EN. Cleveland , Bogoslof , Ibu , Colima .

Home / Alaska / April 06 , 2017. EN. Cleveland , Bogoslof , Ibu , Colima .

April 06 , 2017. EN. Cleveland , Bogoslof , Ibu , Colima .

April 06 , 2017.

 

Cleveland , Alaska :

Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE

Issued: Wednesday, April 5, 2017, 11:41 AM AKDT
Source: Alaska Volcano Observatory
Notice Number:
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians

 

Volcanic Activity Summary:
No activity has been observed at Cleveland Volcano since an explosion was detected in seismic and infrasound data on March 24. Recent satellite images show no significant changes to the summit lava dome or crater since late February to early March. Based on seismic levels remaining low and no observations of continued activity, AVO is lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY.

Remarks:
Cleveland volcano is not monitored with a full real-time seismic network and this inhibits AVO’s ability to detect unrest that may lead to future activity. We are able to detect explosive activity using infrasound and limited seismic instruments on the island.

 

Source : AVO

 

Bogoslof , Alaska :

Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: WATCH
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: ORANGE

Issued: Wednesday, April 5, 2017, 11:42 AM AKDT
Source: Alaska Volcano Observatory
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians

 

Volcanic Activity Summary:
No new volcanic activity has been observed at Bogoslof Volcano in satellite, seismic or infrasound data since a small explosion was detected on March 13. The last major explosive event occurred on March 8, 2017, and occasional high-spatial resolution satellite images show no significant surficial changes due to eruptive activity since that time. Based on the absence of detected activity over the past three weeks, AVO is lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY.

Bogolsof is not monitored by a real-time seismic network and this inhibits AVO’s ability to detect unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of data from seismic and infrasound networks on neighboring islands and satellite and lightning detection data.
Remarks:
Given the lack of a local monitoring network and the unpredictability of the volcano, activity at Bogoslof could ramp up again at any time. Thus a Temporary Flight Restriction (TFR) remains in effect over the volcano for the time being.

 

Source : AVO.

 

Ibu, Halmahera, Indonésia:

 

1.488°N, 127.63°E
Elevation 1325 m

PVMBG reported that an eruption at Ibu at 0058 on 29 March generated an ash plume that rose to an altitude of 1.8 km (5,800 ft) a.s.l. and drifted N. Another event at 0757 on 3 April produced an ash plume that rose to an altitude of 1.7 km (5,500 ft) a.s.l. and drifted S. Seismicity on both days was characterized by events indicating explosions and avalanches.

The truncated summit of Gunung Ibu stratovolcano along the NW coast of Halmahera Island has large nested summit craters. The inner crater, 1 km wide and 400 m deep, contained several small crater lakes through much of historical time. The outer crater, 1.2 km wide, is breached on the north side, creating a steep-walled valley. A large parasitic cone is located ENE of the summit. A smaller one to the WSW has fed a lava flow down the W flank. A group of maars is located below the N and W flanks. Only a few eruptions have been recorded in historical time, the first a small explosive eruption from the summit crater in 1911. An eruption producing a lava dome that eventually covered much of the floor of the inner summit crater began in December 1998.

Volcano Observatory Notice for Aviation (VONA):
Last Issued: 20170404/0101Z
Current Aviation Color Code: ORANGE

Volcanic Activity Summary:
Eruption with volcanic ash cloud at 0013 UTC (0913 local).
Volcanic Cloud Height:
Best estimate of ash-cloud top is around 5200 FT (1625 M) above sea level, may be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information:
Ash cloud moving to south.
Remarks:
Seismic activity characterized by explosion and emission earthquake.

 

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG,  ) , GVP.

Photo : John Massolo

 

Colima , Mexico :

19.514°N, 103.62°W
Elevation 3850 m

On 31 March the Centro Universitario de Estudios e Investigaciones de Vulcanologia – Universidad de Colima reported that during the previous week the seismic data revealed 45 high-frequency events, 33 long-period events, 2.5 hours of tremor, 11 landslides, and two low-intensity explosions. The sulfur dioxide flux was 360 tons/day, an increase compared to the week before.

 

L’image contient peut-être : nuit

The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4320 m high point of the complex) on the north and the 3850-m-high historically active Volcán de Colima at the south. A group of cinder cones of late-Pleistocene age is located on the floor of the Colima graben west and east of the Colima complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, breached to the south, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.

Source: Centre Universitaire d’Études et Investigations de Vulcanologie – Universidad de Colima

Photo : Sergio Tapiro Velasco.

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