January 10 , 2018 . EN. Kilauea , Nevados de Chillan , Cumbal , Sierra Negra .

Home / blog georges Vitton / January 10 , 2018 . EN. Kilauea , Nevados de Chillan , Cumbal , Sierra Negra .

January 10 , 2018 . EN. Kilauea , Nevados de Chillan , Cumbal , Sierra Negra .

January 10 , 2018 .

 

Kilauea , Hawaï : 

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:
No significant change. Lava is not entering the ocean at this time. Kīlauea continues to erupt at its summit and from the Puʻu ʻŌʻō vent on its East Rift Zone. The episode 61g lava flow is producing scattered surface flow activity. Active lava flows pose no threat to nearby communities at this time. This morning, the surface of the lava lake at the Kīlauea summit was 30.5 m (100 ft) below the floor of Halemaʻumaʻu. There have been no significant changes in ground deformation, seismicity, or gas release across the volcano.

Summit Observations:
The lava lake surface rose over the past day; this morning, it was 30.5 m (100 ft) below the floor of Halemaʻumaʻu. Summit tiltmeters continue to record inflationary tilt. Sulfur dioxide emission rates remain high. Seismicity is at normal levels, with tremor fluctuations related to lava lake spattering. Webcam views of the lava lake can be found at https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_webcams.html.

Puʻu ʻŌʻō Observations:
No significant changes are evident at Puʻu ʻŌʻō. The sulfur dioxide emission rate from the East Rift Zone vents has been steady over the past several months and remains significantly lower than the summit emission rate.

Lava Flow Observations:
The episode 61g flow is still active, but no lava is flowing into the ocean. Surface lava flow activity persists on the upper portion of the flow field, on the pali, and in scattered areas along the coastal plain. These lava flows pose no threat to nearby communities at this time.

Source : HVO

Photos : Bruce Omori

 

Nevados de Chillan , Chile :

Special Report on Volcanic Activity (REAV)
Region of Bio Bio. January 9, 2018. 22:10 hours (local time).

The National Service of Geology and Mining (Sernageomin) publishes the following information, obtained thanks to the monitoring equipment of the National Network of Volcanic Surveillance, treated and analyzed at the Volcanological Observatory of the South Andes:
In addition to the sustained recording of the seismic and explosive activity since last December, the Sernageomin staff in collaboration with the ONEMI, from the Bio-Bio region, made an overflight of the Nevados de Chillan volcanic complex on January 09 . This allowed to clearly identify and locate the location and growth of a lava dome inside the active crater. Its exit point corresponds to the location of the crack observed during the previous flight on December 21st.  This crack had in surface a continual emission of steam and gas. The temperatures recorded reached 480 ° C, the highest value since the beginning of the process initiated in December 2016.

The lava dome observed today corresponds to the beginning of the exit of a magmatic body in an effusive (non-explosive) way, whose associated seismicity presents a rate of energy which remains larger but stable. Although seismic signals and other monitoring parameters indicate the rise of a possibly small body, the possibility of explosions such as those previously observed or even of higher energy is not excluded. The expected process associated with the current lava dome growth could take weeks or months; in addition, it has been observed on other volcanoes, that 90% of the domes set up are destroyed explosively.
The development of volcanic seismicity, accompanied by visual aerial observations, makes it possible to diagnose the evolution of this process.
The level of volcanic technical alert remains at the level:
YELLOW alert level

Observation: The area of ​​possible assignment in the current scenario corresponds to a radius of 4 kilometers around the active crater, with particular attention to the area located to the east of the crater.
Sernageomin is continuing its online monitoring and will report in a timely manner on possible changes in volcanic activity in the region.

Source : Sernageomin

 

Cumbal  , Colombia :

Subject: Cumbal Volcano Activity Bulletin.

The level of activity of the volcano is maintained at the level:
YELLOW LEVEL ■ (III): CHANGES IN THE BEHAVIOR OF VOLCANIC ACTIVITY

Following the activity of the CUMBAL VOLCANIC COMPLEX, the COLOMBIAN GEOLOGICAL SERVICE informs that:

For the week of January 2 to 8, 2018, seismic activity recorded an increase in occurrence compared to the previous week, with a predominance of events associated with the movement of fluids within the volcano. Rock-type earthquakes were near the active La Plazuela cone to the northeast of the volcanic complex, with depths of up to 11 km from the summit (4700 m alt.) And a maximum local magnitude of M0 , 7 on the Richter scale.

Favorable atmospheric conditions at the summit revealed gas emissions during all days of the evaluated period, mainly in the El Verde fumarole fields northeast of the volcanic complex; the emission columns were observed white, of low height and variable dispersion according to the direction of the wind.

The COLOMBIAN GEOLOGICAL SERVICE is attentive to the evolution of the volcanic phenomenon and will continue to inform in a timely manner of the detected changes.

Source : SGC

 

Sierra Negra , Galápagos , Ecuador :

Update of the Sierra Negra volcano activity.

On January 6, 2018, earthquakes were recorded in the vicinity of the Sierra Negra volcano on Isabela Island, Galápagos, which were felt by tourists, guides, park rangers and some inhabitants of the upper part of the volcano. (figure 1). ), according to reports published by the Directorate of the Galapagos National Park in Pto Villamil.
The following are the major earthquakes recorded by the seismic stations of the Galapagos Institute of Geophysics on January 6, 2018.

Local time Galápagos     Magnitude      Observations
13h46                                 M3.8                Reported as felt.
3:45 pm                             M2
17h46                                 M2.7
19:31                                  M2.9                Reported as felt.
20h14                                M2.7                Reported as felt.

 

Figure 1: Location of the earthquake of magnitude M = 3.8, felt yesterday afternoon at 14:46:53 (Galapagos time), at a depth of about 4 km.

In addition, other smaller earthquakes were recorded, which could not be located but, due to their characteristics, are located in the same area, totaling 90 events from January 6th afterwards. midday. These earthquakes are located under the caldera of Sierra Negra volcano at shallow depths, less than 8 km away.

Among the observations made, there is no report of surface activity in the region.

This seismic activity could be a new impetus of the magmatic intrusion recorded the previous year and highlighted by the intense seismic activity and the deformation of the caldera floor (INSAR analysis), from the middle of the previous year. (see 2 and 3 of 2017: http://www.igepn.edu.ec/informes-volcanicos/islas-galapagos/gal-sierra-negra/gal-sn-especiales/gal-sn-e-2017).

According to the eruptive history of the Sierra Negra volcano, the last historical eruptions occurred at an interval of 11.4 years and occurred in the area of Volcán Chico, in the N and NW areas of the caldera. His last eruption came in 2005.

Currently, all monitoring indicators indicate that reactivation of this volcano is considered likely. In this sense, the Institute of Geophysics monitors the evolution of the activity and issues alerts in a timely manner in case of new crises.

 Source :  Instituto Geofísico , Escuela Politécnica Nacional

 

 

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