December 09 , 2015. EN. Etna, Popocatepetl, California Volcanoes .

Home / blog georges Vitton / December 09 , 2015. EN. Etna, Popocatepetl, California Volcanoes .

December 09 , 2015. EN. Etna, Popocatepetl, California Volcanoes .

December 09, 2015.

 

Etna, Sicily :

Earlier yesterday, Etna‘s seismic network stations recorded an earthquake swarm on the North East side in a zone middle / high. Until 12:45 local time, were recorded 46 earthquakes, most of these event perceptible only  at the instrumental level.
The main events took place at 10:28 (magnitude M = 3.8) at 10:32 (M = 2.9) at 10:36 (M = 2.4) and 11:53 (M = 3.2). These events were located in the area between Piano Pernicana and Piano  Provenzana at a depth of about 2-4 km of the surface.

 

Coinciding with the swarm, it was reported incidents of fracture with crack width of about 2-4 cm, which hit the surface of the road Mareneve, at an altitude of 1450 m above the level of the sea
At the same time, were recorded two earthquakes in the area of Solicchiata (lower northern slope of the volcano) at 0:21 local (M = 2.6) and 10:36 local (M = 2.4) with depths between 7 and 14 km.

etnaResearchers from INGV-OE work to characterize the phenomenon through analysis of seismicity and slow deformation of the soil; the operating room continues to monitor the developments, update immediately with the Department of Civil Protection and local civil protection structures.The episode of Strombolian and effusive activity at Etna’s New Southeast Crater (NSEC) lasted little longer than 48 hours and then ended during the forenoon of 8 December 2015. On the afternoon and evening of 7 December, besides the eruptive vent high on the east flank of the NSEC cone, a second vent was periodically active in the eastern part of the NSEC proper, as seen in the photo at left, taken by Boris Behncke (INGV-Osservatorio Etneo) from Piano del Vescovo, on the southeast flank of the volcano. The main lava flow extended to a distance of almost 4 km, stopping a short distance downslope of the Monte Centenari cone.

During the early morning hours of 8 December, the Strombolian activity at the NSEC progressively diminished and ended on the forenoon of the same day. On the late afternoon, weak Strombolian activity associated with ash emission was observed at the Northeast Crater.

This morning, the Northeast Crater and the NCSE seemed to have an explosive activity (seen by Salvatore Lo Giudice, from Linguaglossa). To see … .

 

Source : INGV

Photos : INGV, B Behncke, Gio Giusa .

 

 

Popocatepetl, Mexico :

 

December 08, 11:00 h (December 08, 17:00 GMT)

In the last 24 hours the seismic records of the surveillance system at Popocatépetl volcano registered on the one hand 35 low-intensity exhalations. Also were recorded 19 explosions .The cloudy conditions not allow observing a weak emission of steam and gas that winds carried northeasterly. In addition, was recorded low amplitude harmonic tremor totaling 116 minutes and a volcanotectonic event with 1.4 magnitude.

 

Along some lapses of the night was observed slight incandescence, increasing when main exhalations .
From dawn and up to the time of this report it has been noticed a faint but not stopping emission of steam and gas that winds blow about northeast .
CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .
This type of activity is included within the scenarios Volcanic Traffic Light Yellow Phase 2.

 

Source : Cenapred

Photo : Webcamsdemexico

 

 California Volcanoes , United – States :

 

Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN

Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.

Observations for November 1, 2015 (0000h PST) through November 30, 2015 (2359h PDT):
Mt Shasta: One M1 or greater earthquake was detected (M1.29).
Medicine Lake: Ten M1.0 or greater earthquakes were detected, with the largest registering M1.76. These earthquakes occurred during a minor seismic swarm on November 12-13 near the Siskiyou-Modoc county line about 4 miles east-northeast of Medicine Lake.

 

Afficher l'image d'origine

Ubehebe Craters

 

 

Lassen Volcanic Center: No earthquakes of M1.0 or greater were detected.
Clear Lake Volcanic Field: Three earthquakes of M1.0 or greater were detected. The largest event registered M2.21. [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.78].
Long Valley Volcanic Region: In Long Valley Caldera, 17 earthquakes of M1.0 or greater were detected. The largest event registered M2.00. In the Mono Craters region, 1 earthquake of M1.0 or greater was detected and registered M1.37. One earthquake of M1.0 or greater was detected under Mammoth Mountain (M2.03). [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M2.60].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Three earthquakes of M1.0 or greater were detected. The largest registered M1.75.
Coso Volcanic Field: The typical high level of seismicity was observed, with 19 earthquakes M1.0 or greater. The largest registered M2.65.

The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.

 

Source : Calvo/Usgs

Photo : marlimillerphoto.com

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