October 14 , 2016. EN. Piton de la Fournaise , Planchon – Peteroa , Asosan, Turrialba .
October 14 , 2016.
Piton de la Fournaise , La Réunion :
Since the end of the eruption on September 18, 2016 and until October 10, the OVPF recorded a total of :
110 shallow volcano-tectonic earthquakes (0 2 km away under the surface) below the summit craters.
Since September 26, the frequency of earthquakes has decreased and is passed to less than 5 earthquakes per day.
Bilan of surface volcano-tectonic seismicity to the North of the Piton de la Fournaise from September 18 to October 10, 2016. (© OVPF / IPGP)
Inflation (swelling) of the volcanic edifice that has followed the end of the eruption on 18 September, has slowed markedly since 03 October . Since October 6, the apical deformations of the edifice are low.
Illustration of deformation summit since the beginning of the eruption , on 11 to 18 September 2016 (in yellow). Is here represented a baseline (distance between two GPS receivers) through the Dolomieu crater from east to west (black : raw data , in blue data smoothed over a week). An increase is synonymous of elongation and therefore to swelling of the volcano. (© OVPF / IPGP)
Geochemistry of gas:
CO2 concentrations in the soil at the volcano station house are low (noise level).
Source : OVPF
Photo : Fabrice Conques
Planchon-Peteroa , Chile :
Special volcanic activity report (REAV)
Maule Region. October 11, 2016, 11:15 p.m. (local time).
The National Service of Geology and Mining (SERNAGEOMIN) describes the following information obtained by the National Network monitoring teams of volcano monitoring, processed and analyzed at the Volcanological Observatory of Southern Andes, interpretation data center of SERNAGEOMIN :
Friday, October 11, 2016 at 22h48 local time (01h48 GMT), the monitoring stations near the Planchón-Peteroa volcanic complex, recorded one (1) earthquake associated with rock fracturing (volcano – tectonics). The event was located 1 km to the southeast (SE) of the main crater.
The location obtained was as follows:
ORIGINAL TIME: 10:48 p.m. hl (GMT -3)
LATITUDE: 35 ° 14 ‘50′ ‘South
LONGITUDE: 70 ° 30 ‘45‘ ‘West
DEPTH: 4.7 km
LOCAL MAGNITUDE 3.1 (ML)
At the time of publication of this report, there were two aftershocks of lesser magnitude. No significant change was observed in the recorded surface activity in IP cameras.
The level of technical volcanic alert level remains at yellow.
SERNAGEOMIN continuous online monitoring and report timely to the changes in volcanic activity in the region.
Source : Sernageomin.
Asosan, Japan :
32,884 ° N, 131,104 ° E
Elevation 1592 m
JMA reported that explosive eruptions at Asosan’s Nakadake Crater occurred at 2152 on 7 October and 0146 on 8 October, after a period of deformation was detected. Inclement weather prevented visual observations, although satellite images showed the 8 October ash plume rising to an altitude of 11 km (36,100 ft) a.s.l. The Alert Level was raised to 3 (on a scale of 1-5). During an overflight scientists observed high temperatures in the crater, and white plumes rising 300 m above the rim. Ash deposits extended as far as 1.6 km on the NW flank and 1 km on the SE flank.
There were abundant on the NE flank. Ashfall 3 cm thick was reported at the Aso police station 6 km NE. According to news articles, ashfall was reported as far away as 320 km, and some farmers 6-8 km away reported damage to their greenhouses, and a window was cracked from tephra at a youth center 5 km away. Samples analyzed by The National Institute of Advanced Industrial Science and Technology (AIST) and the National Research Institute for Earth Science and Disaster Prevention (NIED) revealed a 10% juvenile magma component, and that the explosions were possibly phreatomagmatic.
Interpretation of aerial images of the eruption of Aso on October 8, 2016 (preliminary).
The Japan Meteorological Agency has interpreted the pictures taken from the sky on October 8, in cooperation with the Office of Regional Development of Kyushu, with the following observations:
The thickness of ejecta around the crater does not exceed 1m, evacuation bunkers and Mucha promenade are not buried
A number of collision traces around the crater and up to 1 km are considered to have been formed by volcanic rock mass (impact crater)
In the crater South and Southwest side, many impacts are confirmed.
In some places of the crater rises white vapor ; the ejecta are considered wet and high temperatures.
It should be noted that from the West crater, at a point on the crater rim, are important fumaroles.
In the photo above, we guess:
• The bottom of the crater, with a part whose surface is smooth, it is the rest of the lake water, steam rises from it , and , floating to the surface, there is a little sulfur to the right of lake.
In addition, the warm water lake is always present in the crater, it indicates a future eruptive phreatomagmatic similar.
Sources: Japan Meteorological Agency (JMA), Reuters , GVP , Sherine France. ( Traduction Google for the rapport ….)
Turrialba , Costa Rica :
Activity report of the Turrialba volcano
October 13, 2016, update 17 hours
Today October 13, 2016, the current energetic eruption of ashes from the Turrialba volcano continued without rest. In the morning, the eruption was accompanied by earthquakes long periods (LPs) with a low amplitude tremor and an eruptive column that is generally maintained at an altitude below 500 m above the crater. The eruption increased in energy to 10:30 and the eruption column reached 1000m height above the crater.
The tremor associated with the eruption also increased in amplitude around this time and remained constant until the publication of this report. IMN weather stations indicate that the wind was blowing to Northwest in the morning and to the North in the afternoon.
Sulfur smell Reports: Lagunilla de Heredia and Heredia
The OVSICORI-A issue two daily reports on the activity of the volcano Turrialba, at 9:00 and 17:00.
13/10/2016, 9:00, Volcan Turrialba
At this time the passive ash emission continues, accompanied by a general tremor of low amplitude. Sometimes this tremor amplitude increases, as well as the ashes emission intensity. The wind direction has been predominantly to the Northwest sectors therefore to the North of the Irazu volcano and the Central Valley can be affected by ash falls. Informa: Dr. Mauricio Mora
Source : Ovsicori, RSN.
Photo : Max Castillo Bonilla , Alberto Alvarado.