October 20 , 2016. EN. Colima , Yasur , Ulawun , Mauna Loa .

Home / blog georges Vitton / October 20 , 2016. EN. Colima , Yasur , Ulawun , Mauna Loa .

October 20 , 2016. EN. Colima , Yasur , Ulawun , Mauna Loa .

October 20 , 2016.

 

Colima , Mexico :

19.514°N, 103.62°W
Elevation 3850 m

Based on webcam and satellite images, and information from Colima Towers, the Washington VAAC reported that ash plumes from Colima rose to altitudes of 5.2-7 km (17,000-23,000 ft) a.s.l. and drifted 35-215 km W, NW, N, and NE during 11-18 October.

 

colima

Explosive activity increases gradually, it start with the destruction of the Dome

Mexico’s Colima volcano spewed several columns of ash and gas on Tuesday that reached up to two kilometers (1.2 miles) into the sky.

Mexico’s Civil Protection agency said the so called ‘Fire Volcano’ first erupted at 11:02 a.m. local time (1602GMT) sending a large column reaching 1.8 kilometers (1.1 miles) into the air.

Ten minutes later, the volcano erupted for a second time.

At 12:12p.m. local time (1712GMT) the volcano erupted once again, this time a column of ash and gas reached two kilometers.

Sources : GVP , wwmt.com.

Photo : Hernando Rivera.

 

Yasur , Vanuatu :

19.53°S, 169.442°E
Elevation 361 m

On 15 October the Vanuatu Geohazards Observatory stated that the Alert Level for Yasur was raised to 3 (on a scale of 0-4), noting that explosions could become more intense. The Alert Level was lowered back to 2 on 18 October. VGO reminded residents and tourists that hazardous areas were near and around the volcanic crater, within a 600-m-radius permanent exclusion zone, and that volcanic ash and gas could reach areas impacted by trade winds.

 

yasur

The Alert Level for Tanna Volcano is lowered to Level 2.

This means that some volcanic explosions remain intense, volcanic bombs may fall in and/or around the crater and volcanic gas and ashes can also affect some villages. The area of risk remains around the volcanic crater and in areas expose to trade winds..
The permanent Exclusion Zone which is about 395 m around the eruptive vents is always closed (Shouldn’t be Access) but the Zones (Zone A and B) beyond this area are opened (Could be Access) (See photo below).

 

This is a reminder to all visitors to observe this volcano away from the crater rim to avoid volcano activity related impacts.
See the safety map and Yasur visitors Fact-Sheet at the Vanuatu Geohazards website http://www.geohazards.gov.vu/index.php/resources.
All communities, villages, visitors and travel agencies have to seriously consider this information.

The Department of Meteorology and Geohazards will continue to closely monitor this volcano activity. More information will be provided when necessary.

Sources : GVP , Geohazard .

 

Ulawun, New Britain, Papua New Guinea:

5.05°S, 151.33°E
Elevation 2334 m

RVO reported that during 1 September-15 October white vapor plumes with varying densities rose from Ulawun, although on 12 October pale gray ash plumes rose from the vent. A report from officers at Hargy Palm Oil dated 13 October stated that a “minor eruption” had occurred after 1800 on 12 October, and that there were a few low noises from the volcano and nighttime glow during 12-13 October. RVO noted that the seismic record did not indicate an eruption.

 

ulawun

Seismicity was at a low to moderate level, dominated by small low-frequency volcanic earthquakes. RSAM values increased and by mid-October were at the highest values (peak of 200) so far in 2016. Based on analyses of satellite imagery, the Darwin VAAC reported that during 16-17 October ash plumes rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted SW and W.

The symmetrical basaltic-to-andesitic Ulawun stratovolcano is the highest volcano of the Bismarck arc, and one of Papua New Guinea’s most frequently active. Ulawun volcano, also known as the Father, rises above the north coast of the island of New Britain across a low saddle NE of Bamus volcano, the South Son.

ulawun

The upper 1000 m of the 2334-m-high Ulawun volcano is unvegetated. A prominent E-W-trending escarpment on the south may be the result of large-scale slumping. Satellitic cones occupy the NW and eastern flanks. A steep-walled valley cuts the NW side of Ulawun volcano, and a flank lava-flow complex lies to the south of this valley. Historical eruptions date back to the beginning of the 18th century. Twentieth-century eruptions were mildly explosive until 1967, but after 1970 several larger eruptions produced lava flows and basaltic pyroclastic flows, greatly modifying the summit crater.

Sources: GVP .Observatoire du volcan Rabaul (RVO), Centre consultatif sur les cendres volcaniques Darwin (VAAC).

Photos :  Wikipedia , geographic.org

 

Mauna Loa , Hawai :

19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Activity Summary:
Rates of deformation and seismicity at Mauna Loa remain above long-term background levels.

Mauna Loa is not erupting. In the past week, earthquakes at Mauna Loa occurred beneath the west and north flanks of the volcano mostly in the 5 – 11 km (3 – 7 miles) depth range. In addition, earthquakes are occurring in south caldera and upper Southwest Rift Zone at depths less than 5 km (3 mi).

 

mauna loa


Global Positioning System (GPS) measurements show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone, with inflation occurring mainly in the southwestern part of the magma storage complex.
Measurements from a continuously-monitored fumarole site within the summit caldera showed relatively steady fumarole temperatures and no significant changes in either sulfur dioxide or carbon dioxide concentrations in volcanic gas emissions.

Source : HVO

Photo : D Peterson , usgs

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