May 28 , 2016. EN. Piton de la Fournaise , Kilauea , Iliamna , Reventador .
May 28 , 2016.
Piton de la Fournaise , La Réunion :
Activity bulletin of Thursday, May 26, 2016 at 22:00 (local time)
The results of this first day of eruption of 2016 is:
This eruption was set up after 8:25 from a very important seismicity associated with the deformations linked to a pressurization in the south east of the Château Fort crater.
To be specific, we observe since May 16, 2016 an increasing trend of indicators followed by OVPF (Flux of gases deformation and seismicity). Slowly enough signals (first gas, then deformation and seismicity finally) showed a significant increase on 10 days with for example a maximum of 10 earthquakes in 24 hours.
The sharpest increase in pre-eruptive activity has made only on 25 May from 11:40 p.m..
The day of 26 May was marked by the arrival of the tremor at 8:05 , and also by very poor weather conditions greatly limiting the observations.
On the ground, a first recognition from 9:00 helped affirm the occurrence of a first eruption by listening and by visual observation of the eruption from the GR from the parking Piton de Bert. Then an aerial survey with the help of the Air Section of the Police and the Peloton de Gendarmerie de Haute Montagne provided a glimpse of several fountains and record a GPS position of the highest point of the fissure (Figure 1).
The bad weather window forced SAG to spend only a few minutes to the vertical of the site, between the clouds. For other aircraft was luckier, some additional elements have been made by the media. A cinder cone (fallen from 6 fountains) is being built on a flat area around 1850 m above sea level about 1km–1.5km in the south east of the Château Fort crater.
At OVPF the records of seismic intensity (RSAM) showed up to about 18H a significant decrease (by a factor 3). Subsequently the intensity has re-grown and is now relatively stable (over the last three hours – see Figure 2).
Figure 1: the highest point of the position of the eruption registered by SAG on May 26 2016. In white and red, respectively the contours of the May and August 2016 eruptions.
Figure 2: Evolution of the RSAM (intensity) between 8H (3h UTC) and 21H (17H UTC) for seismic station Dolomieu South
If time permits, recognition will be made on May 27
Communication from the Prefecture:
Volcanic activity at Piton de la Fournaise: Passage in backup stage
After the eruptive crisis Thursday, May 26, 2016 that led the passage to the level of alert 2-2 device specific ORSEC * Volcano, the Volcano Observatory of Piton de la Fournaise not record any activity tremor type or degassing since this morning 11:40.
In these circumstances, the prefect of Reunion decided the passage to the level of alert: specific device ORSEC * volcano, from 24:40 this Friday, May 27, 2016.
Despite the termination of activity of the geo-physical point of view and the cessation of feeding (end of tremor, vibration associated with the path of the magma and gases it contains)an eruption remains likely in the days and hours to come up.
Consequently, the prohibition of access to the top of the Enclos and put a helicopter in the area of the volcano remain in effect until further notice.
Sources : OVPF , Fournaise info.
Photos : Imazpress reunion
Video : Imazpress reunion
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
The summit lava lake in Halema’uma’u Crater was at a high level earlier in the week, and partly visible from the Jaggar Museum Overlook at times. But over the past few days, the lake level has dropped slightly. Nevertheless, the activity on the surface of the lava lake has been typical of normal activity, with frequent spattering on the lake margins, as shown here. This view looks north from the rim of Halema’uma’u Crater, which is closed to the public due to ongoing volcanic hazards.
Eruptive activity continues at Kilauea Volcano’s summit and East Rift Zone. The two new lava flows from Pu’u ‘O’o are still active but have not advanced significantly overnight. At the summit, deflationary tilt continues and the lava lake level has changed little. Scattered lava flow activity continued on the June 27th lava flow field within about 5 km (3 mi) northeast of Pu’u ‘O’o. None of the Pu’u ‘O’o flows currently pose a threat to nearby communities.
There has been an increase of gas emission from Pu’u ‘O’o since the new breakouts occurred.
Deflationary tilt continued at the summit over the past day. This morning the lava lake level was measured at 39.5 m (130 ft) below the floor of Halema’uma’u crater. Tremor fluctuations associated with lava lake spattering continue. Sulfur dioxide emissions from the summit vent ranged from 4,100 to 7,000 t/d during the past week. Data from GPS networks and interferometric satellite radar (InSAR) show continued long-term inflation of the summit and upper Southwest Rift Zone magma reservoirs.
A view of the 1/2 mile long northern breakout.
Pu’u ‘O’o Observations:
The two new lava flows from Pu’u ‘O’o, which began on May 24, are still active but have not advanced significantly over the past day. One lobe extends about 1.2 km (4,100 ft) to the northwest and another extends about 1.2 km (4,100 ft) to the southeast. Webcam views of both breakouts overnight show continued surface activity feeding these flows. Neither lava flow has extended beyond the existing Pu’u ‘O’o flow field. For recent photographs and maps of these two new active flows, see web links below. Deflationary tilt at Pu’u ‘O’o continued over the past day. Persistent glow from spatter cones within the crater continues; slight subsidence of the crater floor was observed overnight. The sulfur dioxide emission rate from all East Rift Zone vents was about 460 metric tons/day when last measured on May 24.
The lava pond has dropped since the breakouts occurred on Tuesday.
June 27th Lava Flow Observations:
In addition to the new lava flows on the flanks of Pu’u ‘O’o, surface flow activity on the June 27th flow field continues, with small breakouts scattered northeast of Pu’u ‘O’o where they have been occurring for the past several months. Recent satellite images indicate that the active breakouts are within about 5 km (3 mi) northeast of Pu’u ‘O’o. The flows are not currently threatening any nearby communities.
Source : HVO
Photos : HVO , Bruce Omori.
Iliamna , Alaska :
60°1’55 » N 153°5’30 » W,
Summit Elevation 10016 ft (3053 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Just before midnight on Saturday May 21, AVO detected seismic and pressure sensor signals associated with a large non-volcanic avalanche on the north flank of Iliamna Volcano. Avalanche events are somewhat common at this volcano. The seismic signals from the avalanche were observed on volcano monitoring networks throughout Cook Inlet and as distant as the Katmai region 250 km (155 miles) away. There is no indication of any volcanic activity associated with this avalanche.
Iliamna volcano is located on the western side of lower Cook Inlet in the Lake Clark National Park. Iliamna is a snow-covered stratovolcano which rises 10,020 feet above sea level. Although steam plumes occur on its eastern flanks, there has been no historic volcanic activity at Iliamna. Iliamna is located 225 km (140 miles) southwest of Anchorage and 113 km (70 miles) northwest of Homer.
Source : AVO
Photo : Swisseduc.
Reventador , Ecuador :
SUMMARY OF THE ACTIVITIES OF THE VOLCANO
The volcano continues with high activity.
In the afternoon of yesterday and this morning emissions of ash and gas were observed. During the evening hours, incandescent rock falls were observed. At the moment, the volcano’s area is covered.
TECHNICAL AND OBSERVATIONS ANNEX
From 11:00 (TL) yesterday until 11:00 (TL) today, were recorded 48 explosions (EXP), 42 events long period (LP), 8 episodes of tremor emission (TRE) and 10 episodes of harmonic tremor (EMR).
Observations emissions and ashes:
In the afternoon of yesterday and this morning, gas and ash emissions were observed to the northwest ,with an additional emission at 6:45 TL reported by the Washington VAAC, which had a height of about 1000 m to the west.
In the evening, incandescent rock falls were observed up to 1500m on the West , Southeast and East flanks.
At the moment, the volcano’s area is covered.
Rain and lahars:
It did not rain in the volcano area.
This report on a daily basis will be published at 12:00 (TL). In the case of an increase or a change in the behavior of the volcano, it will immediately issued a special report.
Source : IGEPN