04/06/2015. Ubinas, Chaine des Cascades , Wolf .
Ubinas, Perou :
Seismicity associated with fluid movements (LP), shows an increase in recording such events. From 1 June, this activity is probably associated with the pulsed emission of volcanic ash. Events associated with rock fracturing (VT), continued to show an increase in their daily levels. The accumulation of pressure under the volcano is high, based on the increased number of VT and Energy calculated for these earthquakes in this period. A major peak was recorded on May 28, VT 65 and 203 MJ of energy. On May 29, an exhalation of ash, releasing the internal pressure in the system is registered.
This week resumed with more ash emissions, marked by a small expiration who took place on May 29 at 4:29 p.m. local time. The Tremor type of seismic activity is associated with the emission of ash phenomenon. It is worth mentioning the generation of earthquakes LP, probably because of the ash emission pulses (pulsing) .Durant this period, three exhalations were recorded on 29 May at 4:29 p.m. HL with 0.3 MJ of energy, May 30 at 7:41 p.m. HL and June 1st at 3:56 HL. These last two have generated 0.1 MJ of energy.
On 03 June, an ash fall warning bulletin was issued by The INGEMMET and IGP, following a constant emission of 33mn of ash, with an energy of 42 MJ, which amounted to 1200m above the crater. The affected communities are Yalagua, Lloque, Chojata, Escacha,Lucco. The authorities recommended to evaluate the impact of falling ash and implement mitigation measures, such as the provision of masks and lenses and protect the deposits of water and food to avoid contamination.
Source : IGP.
Chaine des Cascades, Etats-Unis :
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.
Perhaps in honor of Volcano Awareness Month, Cascade volcanoes in Washington and Oregon have remained quiet in the past week.
Source : CVO
Photo : Mount St Helens Institute
Wolf, Ile Isabela, Archipel des Galapagos, Equateur :
Overflight and evaluation of volcanic activity:
1. Summary of volcanic activity
After 33 years of peace, the Wolf volcano (1707 m), located at the northern tip of Isabela Island (Galapagos), broke out in the early hours of Monday, May 25, 2015.
The eruption began with a series of explosions that produced a cloud of gas and ash up to 50,000 feet (~ 15 km above sea level) and heading to the South West, NE and S (Washington VAAC). Lava flows began to descend the SE flank, from a fissure located near the crater rim.
During the following days, the activity was characterized by large lava flows, ash without much issue with migration of the main emission area towards Puerto Villamil, the only population of Isabela and more close to the volcano, which was not affected by the eruption. The overflight took place May 29, 2015 and confirmed the presence of a gas plume without ash reaching 2-3 km above the volcano and heading northwest. He could also be observed that the area with active lava was on E and NE flanks of the volcano during the flyover. In recent days, the intensity of volcanic activity has tended to decrease, according to what has been observed in different satellite sensors.
During the approach, from the island of Santiago we could see a large column of gas, without ash content, which rose from the Wolf volcano, reaching a height of about 2-3 km above the summit. By turning around the column might perceive a strong smell of sulfur.
On the eastern flank of the volcano was observed with the naked eye the flows of incandescent lava. Pictures of this region were used to map the northernmost part of the lava field. The mapping of the lava field could be partially due to the cloud cover .
The approach of the volcano occurred along the southeast coast. While the volcano was completely covered, observation with the infrared camera showed the presence of thermal anomalies on the S flank and the SE flank, which apparently correspond to lava flows coming down the flanks. Flying over the W flank was observed the caldera, on his part E, the presence of a very high apparent temperature zone (> 500 ° C) .This area is the origin of the increase in activity in the time of observation.
By continuing overflights to the SE, between clouds, it was observed, the SSE edge of the caldera with a less active area, with a maximum effective temperature (TMA) of 45 ° C. The images obtained in the caldera show no presence of significant thermal anomalies.
Later was flown over the NE flank near the coastal area, where it was possible to observe the glow of a lava flow that descended on the ESE flank of the volcano, which showed very high temperature (> 500 ° C ). In a satellite false-color image taken on May 28, a day before the flyby, we could clearly see the path of the lava flow which had then reached the sea.
Source : IGEPN
Photos : RT , IGEPN.