20/05/2015. Piton de la Fournaise, Chaiten , Kilauea.

20/05/2015. Piton de la Fournaise, Chaiten , Kilauea.

Piton de la Fournaise, La Réunion :

BULLETIN Volcano Observatory OF 19 MAI 2015 At 5:00 p.m.
Highlights since the start of the eruption:

seismic Activity

The intensity of the eruptive tremor on the Château Fort station (near the cracks) is constant for 24 hours (it is divided by 5 compared to the beginning of the eruption).
Note that 51 summital Volcano tectonic earthquakes were recorded since the beginning of the eruption. The OVPF always watching with great attention this phenomenon.


Suivi du tremor à la station FOR 19 mai 2015 17h00 HL(©OVPF/IPGP)

Review of emitted volcanic gases

No significant changes since yesterday
The entire South of the “Enclos”, the “Plaine des Cafres” and “le Tampon” woke up in a sulfur dioxide plume this morning (blue plume). Furthermore we found that the large rivers (Langevin and Rivière des Remparts) drain the plume to the coast.


Measurements of deformationSince the beginning of the eruption, we do not observe any significant subsidence phenomenon at the top of the volcano. The summit area is still under stress.
Regarding the field observations.With the logistical support of SAG three field interventions were possible today:A recognition this morning at 7:30. She helped define the advancing front (currently at 1000 m altitude and 3.5 km of the road). He traveled 750 m in 24 hours.
It also allowed to see the eruptive dynamics. Only one fountain operates. It is high of 20 to 30 m. A flow stretches towards the Grandes Pentes. It is well channeled with a wide free area (red) at the beginning of the flow and then spreads and cooled in surface. In the Grandes Pentes his dynamism is very low and it advance that slowly
– A uninstallation of a threatened scientific equipment (Grandes Pentes South station )
– A gas analysis and shooting dy the thermal camera


Figure: Schematic of the flows. Yellow : GPS points. Black: being cooled flow. Red: active flow

Source : OVPF.
Photo : Loic Herode

Chaiten, Chili :

Special volcanic activity report (REAV), Region of Los Lagos19 / 05/2015 (1900 HL)

Based on the analysis of information obtained from monitoring stations around the Chaiten volcano, the National Geology and Mining Service (SERNAGEOMIN) by the Volcano Observatory of the Southern Andes (OVDAS), issues the following statement:

– Seismic activity associated with the Chaitén volcano presented a slight increase in recent months, mainly expressed in:
The increased frequency and the energy associated with long-period events (related to fluid dynamics in volcanic conduits) volcano tectonic seismicity (events associated with rock fracturing) and hybrid events (related to fluid dynamics in volcanic conduits).


– Regarding the type of hybrid events, the occurrence of 7 events recorded May 17 at 9:10 HL (GMT-3), has been reported in the report “2015_05_17 REAV Los Lagos”. The earthquake of higher energy presented a local magnitude (ML) equal to M 3.6 and an reduced displacement equal to 1500 cm2 , value considered as high
The activity recorded by the IP camera installed near the volcano, this images show a glow on dome complex.
The Mirova website (www.mirovaweb.it), which displays information related to thermal anomalies, alerts on permanent records indicating these characteristic.- The other websites that provide information on volcanic anomalies, have no other data recorded for the volcano .
– There are no reports of community and local authorities reporting anomalies associated with the volcano.


The Chaiten volcano erupted, October 2008

Although activity levels are relatively low in recent monthsin view of the changes in the dynamics of the volcano, with the presence of a still unstable dome complex, this suggests a state of emerging disequilibrium and therefore pushing to change the level of technical alert in Amarillo. Which according to our protocol means changes in parameters from monitoring, indicating that the volcano is above its threshold base and that the process is unstable and can change by increasing or decreasing these levels. These phenomena can be registered as seismic swarms (some noticeable), emission of ash, lahars, morphological changes, noises, volcanic gas odors, among others; that can alter people’s quality of life in the volcanic influence.
SERNAGEOMIN – OVDAS continues to be careful and report timely changes in activity that may occur.

Source : Sernageomin.
Photo : Wikipedia , Gerard Prins.

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

Activity Summary:
Seismicity rates are currently normal beneath Kilauea’s summit and a slight decrease in tilt has been observed on summit tiltmeters. At the East Rift Zone eruption site, surface flows continue to be active within about 8 km (5 mi) of Pu’u ‘O’o.


Summit Observations:

Seismicity rates beneath Kilauea’s summit and Southwest Rift Zone were at normal, background levels during the past day, and tiltmeters recorded a small decrease in tilt in a direction associated with magma accumulation in the Southwest Rift Zone. The summit lava lake level rose slightly to about 40 meters (130 feet) below the original crater floor. This level is 48 meters (155 feet) below the new Overlook crater rim. Sulfur dioxide emission rates averaged 3,400-6,900 tonnes/day for the week ending May 12.

Pu’u ‘O’o Observations:
The tiltmeter on the north flank of Pu’u ‘O’o continues to show no significant tilt, and seismicity rates have been normal. The sulfur dioxide emission rate from all East Rift Zone vents was about 550 tonnes/day when last measured on May 11, 2015.

June 27th Lava Flow Observations:
Webcam images and satellite imagery continue to show surface flow activity from several breakouts in an area northeast Pu’u ‘O’o. All surface flows are occurring within 8 km (5 mi) of Pu’u ‘O’o.

Source : HVO
Photo : Bruce Omori

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