October 18 , 2016. EN. Kilauea , Bulusan, Nevado Del Ruiz , Fuego .

Home / blog georges Vitton / October 18 , 2016. EN. Kilauea , Bulusan, Nevado Del Ruiz , Fuego .

October 18 , 2016. EN. Kilauea , Bulusan, Nevado Del Ruiz , Fuego .

October 18 , 2016.

 

Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Kilauea Volcano continues to erupt at the summit and the Pu’u ‘o’o vent on its East Rift Zone. Tiltmeters at Kilauea’s summit recorded inflationary tilt. The lava lake surface was measured at 10.5 m (34 ft) below the floor of Halema’uma’u Crater this morning. The 61g lava flow continues to enter the sea at Kamokuna posing no threat to nearby communities.

 

kilauea

Summit Observations:
Tiltmeters at Kilauea’s summit recorded inflationary tilt. The lava lake was measured to be 10.5 m (34 ft) below the rim of the Overlook Vent this morning. Webcam views of the lava lake can be found at this webpage: http://hvo.wr.usgs.gov/cams/region_kism.php

Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering. Average daily summit sulfur dioxide emission rates ranged from 5,000 to 7,700 metric tons/day over the past week.

Pu’u ‘o’o Observations:
Webcam images over the past 24 hours show persistent glow at long-term sources within the crater. There were no significant changes in seismicity over the past 24 hours. The tiltmeter recorded no significant tilt, it is flat. The sulfur dioxide emission rate from all East Rift Zone vents was about 358 metric tons/day when last measured on October 14.

Lava Flow Observations:
The 61g lava flow, extending southeast from Pu’u ‘o’o on Kilauea’s south flank continues to supply lava to the ocean at Kamokuna.

 

kilauea

On Saturday, October 15, Kilauea Volcano’s summit lava lake overflowed the vent rim between 1:00 and 2:00 p.m., and again around 6:30 p.m., HST. In this image, captured by HVO’s K2 webcam, you can see small spill-overs (shiny black lava) on the east (far left) and west (right) sides of the vent rim.
In recent weeks, the lava lake level has been rising and falling in concert with summit inflation and deflation (DI-events), with the lake surface often in view of Hawai’i Volcanoes National Park overlooks. On September 22, the lake level rose to within 10 m (33 ft) of the vent rim, the highest level reached since the previous lake overflow in April-May 2015. Since then, the lake level has risen and fallen with multiple DI-events.

A switch to summit inflation on October 13 led to Saturday’s brief overflow, which was soon followed by a return to summit deflation and a drop in the lake level. As of this morning, October 17, the summit lava lake level was 17 m (56 ft) below the vent rim.

 

Source : HVO

 

Bulusan , Philippines :

BULUSAN VOLCANO BULLETIN 19 October 2016 8:00 A.M.

Bulusan Volcano exhibited a steam-driven or phreatic eruption at 4:58 AM from vents on its southeastern upper slope. The event was recorded as an explosion-type earthquake that lasted nine (9) minutes based on the seismic record. Visual observation of the edifice was obscured by thick cloud cover, but limited observations near the vent approximated the eruption plume to have risen (1) kilometer high. Bulusan’s seismic monitoring network additionally recorded twenty-eight (28) volcanic earthquakes in the past 24 hours. Sulfur dioxide (SO2) emission was measured at an average of 176 tonnes/day on October 18, 2016. Precise leveling data obtained on August 16-25, 2016 indicated slight inflationary changes of the edifice relative to May 2016. Similar inflationary trends were recorded by continuous GPS measurements until 30 September 2016, indicating pressurization beneath the edifice.

 

bulusan

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to more steam-driven or phreatic eruptions. Local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited and that vigilance in the Extended Danger Zone (EDZ) must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions.

BULUSAN VOLCANO ADVISORY DECLARATION OF AN EXTENDED DANGER ZONE ON THE SOUTHERN FLANK 18 October 2016 4:30 P.M.
Recent low-magnitude phreatic eruptions from Bulusan Volcano have noticeably emanated from three source areas on its upper slopes. These are the northwest vents and the summit crater, for eruptions spanning 1 May 2015 to 6 October 2016, and the southeast vents for the latest eruptions on 30 September and yesterday, 17 October. While these eruption sources are within the Four-Kilometer Radius Permanent Danger Zone or PDZ wherein habitation is strictly prohibited due to a permanently high degree of hazards, the southeast vents bring about increased concern. These vents fundamentally emanate from a fissure extending two kilometers obliquely down the southern upper slopes. The southeast vents thus pose a potential source of eruption that is close to the populated villages of Brgys. Mapaso, Irosin, and San Roque, Bulusan, endangering these with the volcanic hazard of impacting large ballistic ejecta. In addition, small-volume but hazardous pyroclastic density currents can potentially be generated by stronger steam-driven or phreatic eruptions and travel down the Malunoy and Mapaso Rivers, endangering these barangays and, additionally, Brgy. Patag, Irosin.

 

 bulusan

In view of this, PHIVOLCS declares an Extended Danger Zone or EDZ on the southern slopes of Bulusan Volcano stretching two kilometers further downslope of the PDZ. The EDZ encompasses Brgys. Mapaso, San Roque and Patag and shall function in conjunction with the PDZ to warn against the potential for volcanic hazards from phreatic eruptions during Alert Levels 1 and 2 only. Local government and disaster management officials are advised to be additionally vigilant and prepare precautionary measures to ensure the safety of the residents of the above barangays. Specific measures must include avoidance of areas adjacent to the PDZ and the Malunoy and Mapaso Rivers. These precautionary measures should be observed during periods of increasing trends in volcano monitoring parameters as provided by PHIVOLCS that may be precursory to phreatic eruption.

Alert Level 1 status currently prevails over Bulusan Volcano. Local government units and the public are reminded that entry into the PDZ is strictly prohibited due to the possibility of sudden and hazardous phreatic eruptions at any of the current active vents and possible new ones that can develop on the upper slopes. PHIVOLCS is closely monitoring the recent changes in the activity of Bulusan and will inform all stakeholders immediately should there be any developments and changes in the current conditions of the volcano.­­­­

 

Source : Phivolcs.

 

Nevado Del Ruiz , Colombia :

Weekly Bulletin of activity of the volcano Nevado del Ruiz, from 11 October to 17 October 2016

The level of activity continues at:
Activity level Yellow  or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz, the Colombian Geological Service reports that:

During the past week, different monitoring parameters show that the Nevado del Ruiz volcano remains unstable.

Seismic activity related to the fracturing of the volcanic rock beneath the volcano, represented by volcano-tectonic earthquakes (VT) have, compared to the previous week, a slight decrease in the number of earthquakes and seismic energy released. This seismicity has been located primarily in the distal seismogenic source from the North, and to a lesser extent, in the areas of the East, Southeast, Northeast and around the Arenas crater. The depths of the earthquakes were between 1.0 and 7.9 km. The maximum magnitude recorded during the week was 2.2 ML (local magnitude), corresponding to two earthquakes recorded on 11 and 14 October at 19:15 and 4:41 (local time), respectively, located in the northern end sector distal of the volcanic edifice, at 5.7 km depth.

nevado-del-ruiz

Seismic activity related to fluid dynamics in volcanic conduits was characterized by the continuity in the occurrence of earthquakes long period (LP) and very long period (VLP), pulses of tremors and multiple earthquakes of fluid  , with varying levels of energy. The appearance of increased LP type earthquakes, recorded on October 17 from 6:00 p.m. to 8:30 p.m. is highlighted. This type of seismicity was mainly located in the Arenas crater around this one and to a lesser extent in Southeast sector of the volcano. Some of these seismic signals have been associated with the emissions of gas and ash into the atmosphere, as has been confirmed from images captured by the cameras installed in the volcano area and by statements made by officials of the National Natural Park of Los Nevados (NNNP) and by the Geological Service of Colombia (QMS).The registration of new seismic signals of this type with higher energy levels can be associated with gas and ash emissions is not excluded. It is important to remember that the ash emission process can occur over several days and sometimes several times a day without involving individual episode of each report. There are already 23 months that these ash emission processes continue  on the volcano Nevado del Ruiz, which in this current cycle of activity, are not an indication of an imminent eruptive activity.

nevado-del-ruiz

The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to determine changes in the tilt, the position and the shape of the volcano, respectively, continued to record Changes.

The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), as shown by the values obtained by the SCANDOAS stations in the volcano area analysis and on satellite imagery. In follow-up information provided by the portal Mirova, a thermal anomaly was identified of 5MW, which is considered low.

The column of gas, steam and ash time to time reached a maximum height of 2500 m above the top of the volcano on 15 October. The direction of the dispersion of the column was in compliance with the prevailing wind in the area, which during the first days of the week showed a dominant direction in the Northwest, promoting the dispersion of the ashes to the populations lying in these directions.

The Nevado del Ruiz volcano continues at Amarillo activity.

Source : SGC.

Photos : Archives SGC

 

Fuego , Guatemala :

Activity:
Persistence of moderate white fumaroles, at a height of 4,600 meters (15,092 feet), which disperse in a southwest direction. 8 explosions, 5 low and 3 moderate are reported, emitting gray column to a height of about 4500-4700 meters. (14.763 to 15.420 feet) that have spread to a distance of 10 km in a southwest direction.

fuego

The explosions raised incandescent pulses at a height of 200 meters above the crater, creating light to moderate avalanches around the edge of the crater, and in ravines to reach the limits of vegetation. Explosions were accompanied by low rumbles generating moderate shock waves, causing vibrations on the roofs of neighboring houses of the volcano. Ash falls were reported in San Pedro Yepocapa, Sangre de Cristo, Santa Sofía, Morelia, Panimaché I and II.

Source : Insivumeh.

Photo : Diego Rizzo

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