October 27 , 2016. EN. Kilauea , Turrialba , Papandayan, Ebeko .
October 27 , 2016.
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 East Rift Zone. The summit lava lake surface is about 16 m (52 ft) below the floor of Halema’uma’u Crater this morning. The 61g lava flow continues to enter the sea at Kamokuna, posing no threat to nearby communities.
Tiltmeters at Kilauea’s summit currently record deflation that began around midnight. The height of the lava lake surface dropped about 2 m (6 ft) over the past 24 hours. Spattering continues intermittently from various locations on the surface of the lake.
Seismicity is within normal, background rates with tremor amplitude fluctuations responding to changes in the vigor of lava lake spattering. Average daily summit sulfur dioxide emission rates ranged from about 3,000 to 7,100 metric tons/day during the past week.
Pu’u ‘O’o Observations:
Webcam images, when available during the past day, show persistent glow at long-term sources within the crater. There were no significant changes in seismicity over the past 24 hours. The tiltmeter on Pu’u ‘O’o cone recorded slight deflation over the past day. The sulfur dioxide emission rate from all East Rift Zone vents was about 375 metric tons/day when last measured on October 20.
Lava Flow Observations:
The 61g lava flow, extending southeast from Pu’u ‘O’o on Kilauea’s south flank continues to enter the ocean at Kamokuna.
Source : HVO
Photos : Merci à David Ford.
Turrialba , Costa-Rica :
Report of the eruptive activity of the volcano Turrialba
October 26, 2016, updated 17:00.
In the last 24 hours, the volcano has had a series of small to moderate ash emissions, with columns that reached a maximum of 1000 m above the top of the volcano (5:25 local time), but for most have not exceeded pulses of 500m.
During the periods of low activity, passive gas and aerosols emissions are recorded.
The seismic signals showed a tremor of almost constant amplitude during moderate ash emissions and low amplitude during other periods. Some LP and VT events of type were indistinguishable from background levels, but often confused in the tremor signal. It has not always been possible to verify that the tremors were accompanied by ash emissions, due to the high cloud conditions at the summit. The wind direction was toward the northwest and west by the IMN stations. Ash falls were reported in Coronado, San Miguel de Desamparados and Guácimo.
Volcanic Tremor: seismic signal characterized to present a record on seismographs as a form of waveform sustained over time whose amplitude and frequency may vary. The origin of the tremor is due to vibrations inside the volcano, produced by the passage of fluids (gas, water, magma) through cracks and ducts inside the volcano.
Aerosol : colloid with solid particles and / or liquid particles suspended in a gas. The size of these particles may be from 0,002μm to 100 microns.
Source : Ovsicori
Photos : Ovsicori , Alberto Alvarado.
Papandayan , Indonésia :
Elevation 2665 m
PVMBG reported that during 1 August-17 October seismicity at Papandayan fluctuated but decreased overall. Visual monitoring occurred from the Pakuwon Village post where observers noted white plumes rising at most 35 m above the crater. The Alert Level was lowered to 1 (on a scale of 1-4) on 19 October; residents and tourists were reminded not to approach the craters within a 500-m radius.
Papandayan is a complex stratovolcano with four large summit craters, the youngest of which was breached to the NE by collapse during a brief eruption in 1772 and contains active fumarole fields. The broad 1.1-km-wide, flat-floored Alun-Alun crater truncates the summit of Papandayan, and Gunung Puntang to the north gives a twin-peaked appearance. Several episodes of collapse have created an irregular profile and produced debris avalanches that have impacted lowland areas. A sulfur-encrusted fumarole field occupies historically active Kawah Mas (« Golden Crater »). After its first historical eruption in 1772, in which collapse of the NE flank produced a catastrophic debris avalanche that destroyed 40 villages and killed nearly 3000 people, only small phreatic eruptions had occurred prior to an explosive eruption that began in November 2002..
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, également connu sous CVGHM) , Gvp.
Photo : S Malassenet
Ebeko, Paramushir Island , Russia:
Elevation 1103 m
A moderate gas-steam activity of the volcano continues. Ash explosions up to 16,400 ft (5 km) a.s.l. could occur at any time. Ongoing activity could affect low-flying aircraft and airport of Severo-Kurilsk.
According to the data by observers from Severo-Kurilsk (Paramushir Island, Northern Kuriles), five explosions of gas-steam containing ash occurred at the volcano on 19-20 October. Plumes rose up to 1.5 km a.s.l. and extended for about 15-20 km to the northeast from the volcano. Satellite data by KVERT showed the volcano was covered by dense clouds.
KVERT reported that, according to observers in Severo-Kurilsk (Paramushir Island) about 7 km E, a gas-and ash -steam plume continuing rose from Ebeko to an altitude of 1.5 km (4,900 ft) a.s.l. and drifted 15 km ENE on 20 October. The Aviation Color Code was raised to Yellow (the second lowest on a four-color scale). Later that day observers noted gas, steam, and ash plumes rising 1.3-1.4 km (4,300-4,600 ft) a.s.l. and drifting 10 km NE. Ground-based and satellite observations during 21-23 October indicated quiet conditions; the Aviation Color Code was lowered to Green on 24 October.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT) , Gvp .
Photo : T. Kotenko, IVS FEB RAS, KVERT , 19/10/2016