December 02, 2016. EN. Ticsani , Sabancaya , Kilauea , Yellowstone , Cerro Hudson .

Home / blog georges Vitton / December 02, 2016. EN. Ticsani , Sabancaya , Kilauea , Yellowstone , Cerro Hudson .

December 02, 2016. EN. Ticsani , Sabancaya , Kilauea , Yellowstone , Cerro Hudson .

December 02, 2016.

 

Ticsani , Peru :

Activity of the volcano Ticsani
Update of the main activity observed between 15 and 30 November.

The volcano Ticsani, located 8 km east of the town of Calacoa (Moquegua), is a stratovolcano whose main characteristic is to have presented very large avalanches. Today, a possible eruption of the volcano Ticsani is a potential danger for the surrounding villages like Calacoa (8 km from the crater), Carumas (11 km).

The Southern Volcanological Observatory (OVS) of the Institute of Geophysics of Peru (IGP) monitored the seismic activity and behavior of the Ticsani volcano through a recently installed local telemetry network, which has been operational since August 2015.

 

ticsani

Sismovolcanic vigilance:
Rock fracturing (VT) events near the Ticsani (less than 6 km from the crater) recorded a peak on 24 November as a seismic swarm (188 events). The average rate for this period was 24 VT / day, similar to the previous period.
The events  Volcano-Tectonic Distals type (EDV) showed a slight increase with an average of 6 VTD / day (4 VTD / day of the previous period). Their presence is sporadic and of low energy (less than 1 MJ).
For Tremor-type events, a slight increase of 2.6 min / day was observed; However, these are not very energetic events (less than 1 MJ). Events of hybrid type, on the other hand, occur from time to time. During this period, two events were observed with low energy levels.

ticsani

Location of events.
During this period, the spatial distribution of earthquakes is mainly concentrated near the Ticsani volcano (group G1), reaching 9.5 km in depth. The earthquakes located in this group are mainly the 24 November swarm. It is also possible to see another group (G2) near the Ticsani. The most striking earthquake in this period was recorded on 23 November at 20:56 HL (local time), magnitude 3.2 ML. This event was located next to the recent dome.

Surveillance by satellite.
SO2 Anomalies: The GSDM-NASA « EOS Aura » satellite system (http://so2.gsfc.nasa.gov/) recorded low SO2 gas density values during this period.
Thermal anomalies: The Mirova system (from www.mirovaweb.it) did not detect any thermal anomalies on the Ticsani volcano (VPR = 0 Mega Watts).

Source : IGP

 

Sabancaya , Peru :

The Scientific and Technical Committee for Volcanic Risk Management in the Arequipa Region, composed of the IGP South Volcanological Observatory (OVS-IGP) and the INGEMMET Volcanological Observatory (OVI), shares the Daily Activity Report of the volcano Sabancaya, Thursday 1 December 2016.

Daily Monitoring Report of the Sabancaya VOLCAN
RDSAB-10-2016 / OVI-OVS – 1 December 2016.

WARNING LEVEL: YELLOW

 

sabancaya

The IGP South Volcanological Observatory (OVS-IGP) and the INGEMMET Volcanological Observatory (OVI), which form part of the Scientific and Technical Committee for Volcanic Risk Management in Arequipa Region, report on the activity of the Sabancaya volcano today:

In general, the volcanic seismic activity of the Sabancaya volcano remains constant. Indeed, today there was only the total energy variation of the explosions (= 648 MJ yesterday, today = 358 MJ). The number of explosions was 46.
-The eruptive columns of gas and ashes rose to 4500 m above the crater. These light gray columns spread south-south-east, within a maximum radius of 40 km, affecting the villages located in the region.
-The volcanic SO2 gas flow was 1547 TN / day (30/11/2016). Higher production of SO2 implies a higher probability of occurrence of acid rain.
-The millimetric inflation of the southeast flank of the volcano continues, with an increase of 3 mm (30/11/2016).
-The activity is expected to increase in the coming days.

 

Source : IGP

Photo : Archive

 

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:
Eruptions continue at Kilauea Volcano’s summit and East Rift Zone. The episode 61g lava flow in the East Rift Zone continues to enter the ocean at Kamokuna, feeding a small breakout on the lower pali along the way. In addition, the November 21 breakout at the episode 61g vent was active over the last day, advancing slowly to east, and was joined by a new breakout from the episode 61g vent early this morning. None of these lava flows pose a threat to nearby communities at this time. The lava lake at Kilauea’s summit continues to circulate and spatter, with small fluctuations in level. Seismic activity continues at a low rate and deflationary tilt started at the summit last night.

 

kilauea

Summit Observations:
Summit tiltmeters recorded the onset of deflationary tilt at about 10 PM last night (11/30), marking the start of a new deflationary-inflationary cycle (DI event). Seismic activity continues at a low rate. The summit lava lake level and the amplitude of summit seismic tremor continue to fluctuate as spattering in the lake waxes and wanes. There was, however, an overall drop of several meters (yards) associated with the ongoing summit deflation. The depth to the surface of the lava lake was measured this morning at 13.5 m (~44 ft) below the adjacent floor of Halema’uma’u Crater. This is still a high level, and the lake surface was easily visible this morning from Jaggar Museum, when not socked in by the weather. Over the past week, the average daily sulfur dioxide emission rate at the summit has ranged from 2,300 to 6,600 metric tons/day.

kilauea

Kilauea’s summit lava lake in Halema’uma’u is about 255 m (~840 ft) long (left to right in the image) and 195 m (~640 ft) wide. From this perspective, magma rises into the lake near its north edge (upper left) and circulates to the south, where it sinks all along the south margin of the lake. The rim of Halema’uma’u is at the right edge of the photo, and the closed visitor overlook is hidden beneath the fume at upper right.

Pu’u ‘O’o Observations:
Webcam views show persistent glow from sources within Pu’u ‘O’o crater and from a vent near its northeast rim. The sulfur dioxide emission rate from all East Rift Zone vents was about 340 metric tons/day when last measured on November 30. Seismicity continues at low levels.

 

Lava Flow Observations:
The November 21 breakout from the episode 61g vent on the east flank of Pu’u ‘O’o remains active, based on webcam views. At about 4 AM this morning, a new breakout (much like the November 21 breakout) started from the episode 61g vent, sending more lava streaming to the east. This new breakout was still active at sunrise, having advanced a few hundred meters (yards) downslope. Lava also continues to travel through the main (original) branch of the episode 61g flow and enter the ocean at Kamokuna, where activity has been concentrated on the east side of the delta. The vigor of the plume waxed and waned through the day yesterday, sometimes becoming very wispy. A breakout near the base of the Pūlama pali, inland from the ocean entry, also remains active.

Source : HVO

Photos : Bruce Omori , HVO

 

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 November 2016, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 142 earthquakes were located in the Yellowstone National Park (YNP) region. The largest events were two microearthquakes of magnitude 2.9 the first occurred on November 24, 10:47 PM MST, located 6 miles southwest of West Thumb, WY, the second on November 26, 07:53 AM MST located 7 miles north northwest of Lake, YNP.

November seismicity includes two swarms.

1) The most active swarm of 63 earthquakes occurred November 23 — 26, 6 miles southwest of West Thumb, WY. The largest earthquake in this swarm is the magnitude 2.9 on November 24, detailed above.

2) A smaller swarm of 14 earthquakes occurred November 1 — 2 near West Yellowstone, MT. The largest event of this swarm (magnitude 1.3) occurred November 2, 02:48 PM (MDT), nine miles northeast of West Yellowstone, MT.

Yellowstone earthquake activity in November is at normal background levels.

 

Castle Geyser

Ground deformation

Uplift centered near the Norris Geyser Basin, which began in early 2016, continues at a rate of ~5 cm/yr. Over this interval, the NRWY GPS station has risen about 4.5 cm and moved about 2.5 cm to the south-southeast. Caldera GPS stations continue to record slow subsidence at a rate of about 1.5 – 2 cm/yr.

Current deformation patterns at Yellowstone remain within historical norms.

An example of GPS data can be found at http://www.unavco.org/instrumentation/networks/status/pbo/data/WLWY (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

Photo : bentwoodinn.com

 

Cerro Hudson, Chile :

Hudson volcano (November 1 to 30). The level of activity of the volcano is modified:
YELLOW LEVEL: changes in the behavior of volcanic activity – probable time for an eruption: weeks / months.

Seventy (70) seismic events, of which sixty-three (63) were classified as volcano-tectonic (VT), associated with rigid material fracturing processes of magnitude M3 or less were recorded. The most energetic event was located 3.7 km west-northwest (ONO) of the center of the caldera, at a depth of 4.8 km. Similarly, one (1) hybrid earthquake (HB) associated with a process combining fracturing of rigid material and fluid dynamics within volcanic ducts was recorded with a local magnitude (ML) = 3,6, and a reduced displacement value (RDC) equal to 2930 cm2. It was located 5.9 km west-northwest (ONO) of the center of the caldera, at a depth of 4.8 km. In addition, five (5) long period earthquakes (LP) associated with the transport of fluids in the volcanic system with a magnitude (ML) of M0.9 and a reduced displacement value DRC) of not more than 12, were recorded. In addition, a tremor seismic event (TR), 1.5 Hz dominant frequency and and reduced displacement (RDC)  equal to 9.7 cm2 was recorded.

 

Cerro Hudson– No anomalies in emissions of sulfur dioxide (SO2) in the atmosphere adjacent to the volcanic field have been reported, according to data obtained by the IMO (Ozone Monitoring Instrument).
– No thermal alert was reported in the area associated with the volcano according to data published by MODVOLC (Moderate Resolution Imaging spectroradiometer).

Although the rate of occurrence of seismicity associated with the volcanic system has remained similar to levels in earlier periods, the energy intensity of events has gradually increased in recent months. Furthermore, the events recorded over the last few weeks are related to the seismic source that was active during the volcanic crisis of 2011. While the internal dynamics of the volcanic system vary and the magnitude of the seismicity is above its basic level, the technical alert level is changed to YELLOW LEVEL.


Source : Sernageomin

Photo : Aysen Regional Government

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