25/04/2015. Calbuco, Kilauea .
Calbuco, Chili :
ACTIVITY CONTINUING ON CALBUCO.
After the two eruptive pulses on 22 and 23 April the signs of the instability of volcanic system of the Calbuco volcano are provided in the report of SERNAGEOMIN-OVDAS.
“Special Volcanic Activity Report (REAV)”
Based on the analysis of information obtained by monitoring stations near the Calbuco volcano, the National Geology and Mining Service (SERNAGEOMIN) and Volcanological Observatory of the Southern Andes (OVDAS) announces:
From the 23/04/2015 at 23:30 HL, we saw an increase in the surface activity of the volcano, evident by the presence of a column of particulate material (maximum height of 2 km) with a preferential distribution varying Northeast sector at the South-East in the afternoon. This process was sustained until the issuance of this report, and was accompanied by a continuous seismicity of tremor type (related to the movement of volcanic magmatic fluids in the system).
The present volcanic activity suggests that the system has entered an unstable phase with sustained activity, which could be the precursor of a magmatic processes that could generate lava flows and / or the establishment, on the surface, of an dome.
Under current conditions, the most affected region was concentrated near the centers of emission and valleys previously affected by pyroclastic flows and lahars. Small amounts of fly ash can precipitate in the areas located on the axis of dispersion (Ensenada and Lago Chapo). Due to the development of the situation and in accordance with current conditions, it is suggested to maintain the access restriction zone of 20 km.
The level of technical alert is maintained at RED
SERNAGEOMIN – OVDAS continues to be attentive, and report timely changes in activity that may occur.
Source : Sernageomin.
Photos : Pedro Cubillos , Marcello Reyes.
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
Kilauea Volcano continues to erupt at its summit and from its East Rift Zone. The summit continues to inflate, and the lava lake, in response, has risen to its highest recorded level of the current summit eruption. Widespread breakouts are active within about 8 km (5 mi) of Pu’u ‘O’o.
The Overlook crater lava lake, within Halema’uma’u Crater at Kilauea’s summit, has been rising over the past few days, and today reached the highest point yet measured for the current summit eruption. The lava lake this afternoon was 20 meters (66 feet) below the Overlook crater rim.
Tiltmeters at Kilauea’s summit recorded continued inflation over the past day, marking a total of about 4.5 microradians since inflation started on Tuesday afternoon (April 21). Mirroring this trend, the level of the summit lava lake has risen to its highest level since the summit eruption began in March 2008. It was measured at 20 m (66 ft) below the rim of the Overlook crater yesterday afternoon, and is at least a few meters (yards) higher this morning. The surface of the lava lake came into view yesterday afternoon, when observed from the Jaggar Museum overlook, and remains in view this morning.
The lava level was high enough at the lava lake this evening that bits of spatter were reaching the rim of the Overlook crater.
The high level triggered a small collapse from the overhanging west wall and rim of the Overlook crater at about 5:20 AM this morning, triggering a small explosive event that threw spatter out onto the Halema’uma’u crater floor. Increased seismicity continues beneath Kilauea’s summit and upper East Rift Zone. Sulfur dioxide emission rates averaged 4000-7000 tonnes/day for the week ending April 14.
Pu’u ‘O’o Observations:
The tiltmeter on the north flank of Pu’u ‘O’o recorded little change in ground tilt, though there is a weak inflation that may be a subtle response to ongoing summit inflation.
In the time since our last overflight (March 24), a new collapse pit has formed in the western portion of Pu’u ‘O’o Crater. This circular pit can be seen in the lower left portion of the photograph, and measures about 27 m (roughly 90 ft) in diameter. Numerous hot cracks were observed in this general area during previous visits on foot.
Small lava flows erupted sporadically from vents at the south and southeast edges of the crater through the day yesterday. These flows were confined to crater. The sulfur dioxide emission rate from all East Rift Zone vents was about 850 tonnes/day when last measured on April 21, 2015.
June 27th Lava Flow Observations:
Field observations yesterday found continued widespread activity northeast of Pu’u ‘O’o. The most distant activity was burning forest about 8 km (5 mi) northeast of crater.
Source : HVO