28 Octobre 2024.
Indonesia , Lewotobi Laki-laki :
An eruption of Lewotobi Laki Laki occurred on Monday, October 28, 2024, at 11:13 WITA with the height of the ash column observed at ± 1000 m above the summit (± 2584 m above sea level). The ash column was observed to be gray in color with a thick intensity, oriented towards the northwest. This eruption was recorded on a seismograph with a maximum amplitude of 7.4 mm and a duration of 484 seconds.
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA
Issued : October 28 , 2024
Volcano : Lewotobi Laki-laki (264180)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Lewotobi Laki-laki Volcano Observatory
Notice Number : 2024LWK689
Volcano Location : S 08 deg 32 min 20 sec E 122 deg 46 min 06 sec
Area : East Nusa Tenggara, Indonesia
Summit Elevation : 5069 FT (1584 M)
Volcanic Activity Summary :
Eruption with volcanic ash cloud at 03h13 UTC (11h13 local).
Volcanic Cloud Height :
Best estimate of ash-cloud top is around 8269 FT (2584 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer.
Other Volcanic Cloud Information :
Ash cloud moving to northwest. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick.
Remarks :
Eruption recorded on seismogram with maximum amplitude 7.4 mm and maximum duration 484 second.
Source et photo : Magma Indonésie.
Mexico , Popocatepetl :
October 27, 11:00 (October 27, 17:00 GMT) , Activity in the last 24 hours .
16 exhalations were detected, accompanied by water vapor, volcanic gases and ash. In addition, 1,349 minutes of high-frequency tremor of very low to moderate amplitude were recorded .
During the morning and at the time of this report, a continuous emission of water vapor, volcanic gases and ash is observed with dispersion towards the Northeast (NE).
The Popocatépetl volcanic alert fire is in yellow phase 2.
The scenarios anticipated for this phase are:
A few small to moderate explosions
Occurrence of tremors of varying amplitudes
Light to moderate ash rains in the surrounding towns and in some more distant towns
Ejection of incandescent fragments within the 12-kilometer exclusion radius
The occurrence of lahars can be expected to descend into the ravines, due to the accumulation of ash on the slopes and their interaction with the rains expected in the coming weeks.
Possibility of pyroclastic flows not reaching the populations
Source et photo : Cenapred.
Chile , Puyehue – Cordon Caulle :
Seismology
The seismological activity of the period was characterized by the recording of:
67 VT type seismic events, associated with rock fracturing (Volcano-Tectonic). The most energetic earthquake had a Local Magnitude (ML) value equal to 2.6, located 4.0 km to the East-Southeast, at a depth of 4.7 km in reference to the 2011 crater.
5 LP type seismic events, associated with fluid dynamics within the volcanic system (Long Period type). The size of the largest earthquake evaluated from the Reduced Displacement (DR) parameter was equal to 5 cm2.
Fluid Geochemistry
No anomalies were reported in the emissions of sulfur dioxide (SO2) into the atmosphere in the area near the volcanic complex, according to data published by Tropopheric Monitoring Instrument (TROPOMI) and Ozone Monitoring Instrument (OMI) Sulfur Dioxide Group.
Thermal anomalies by satellites
During the period, no thermal alerts were recorded in the area associated with the volcanic complex, according to the analytical processing of Sentinel 2-L2A satellite images, in combination with false-color bands.
Geodesy
Geodetic observations, based on 2 GNSS stations operating in the volcanic area studied, indicate that the inflationary process recorded by OVDAS since 2017 continues, observing in particular:
– Horizontal and vertical displacement rates with lower magnitudes, compared to the magnitudes recorded in recent months, with maximum rise rates of 0.6 cm/month.
– The distance between the two stations maintains an elongation trend, calculating an increase rate of 1.1 cm/month.
The trends and directions of displacements of the current period are generally maintained compared to recent months, with no relevant changes observed in the depth source that produces the deformation.
Surveillance cameras
The images provided by the fixed camera, installed near the volcanic complex, did not record degassing columns or variations related to surface activity.
Satellite geomorphological analysis
No changes in the evolution of the active morphologies of the volcanic complex are identified from the Planet Scope and Sentinel 2 L2 A satellite images.
During the period evaluated, the monitoring parameters of the activity of the volcanic system remain stable. On the seismic level, a low recurrence of activity related to volcanic processes is observed. At the same time, volcanic deformation remains active, but with a slight downward trend. Although the activity is lower in the current period, signals related to the internal dynamics of the system considered above its basic threshold are still recorded.
The volcanic technical alert is maintained at:
YELLOW TECHNICAL ALERT: Changes in the behavior of volcanic activity.
Source : Sernageomin
Photo : Sergio Osses.
Costa -Rica , Rincon de la Vieja / Poas :
Rincón de la Vieja Volcano
Latitude: 10.83°N;
Longitude: 85.34°W;
Altitude: 1916 m
Current activity level: Warning
This week, 6 exhalations of water vapor, gas, and aerosol plumes and a small eruption were recorded. The eruption was recorded on October 22 at 1:14 AM. None of the exhalations generated lahars or ash emissions. The background seismic-volcanic tremor remains low amplitude and stable. Occasionally, a variation in the dominant frequency of the tremor is observed after exhalations or eruptions. Sporadic low magnitude distal volcano-tectonic earthquakes associated with rock breakage are recorded. The occurrence of long-period and « tornillo » type signals continues. The dominant frequency of the « tornillo » type signals shows a slight increase during this week. When there is visibility, the degassing of the crater is quite regular and constant. In recent weeks, a slight contraction and subsidence of the base of the volcanic edifice as well as a slight elevation of the summit station have been detected. The MultiGas station recorded weekly averages of 1.4 ± 0.8 for CO2/SO2 and 0.14 ± 0.05 for H2S/SO2, typical values for magmatic gases. The SO2 emission was 437 ± 210 t/d. The Sentinel-5P satellite detected a mass of SO2 of 14 tonnes in the atmosphere on 19 October.
Poas Volcano
Latitude: 10.20°N;
Longitude: 84.23°W;
Altitude: 2687 m
Current activity level: Warning
Seismic tremor remains moderate to low amplitude and very stable. Low frequency, low amplitude LP seismic events are recorded. This week, LP events occurred in lower numbers than last week. In addition, the magnitude of the events has returned to a stable baseline.
Sporadic short tremors are recorded. Geodetic observations do not detect significant deformation. The MultiGas station recorded weekly averages of 0.8 ± 0.2 for SO2/CO2 and 0.04 ± 0.03 for H2S/SO2, and a decreasing trend is observed for H2S/SO2.
. SO2 concentrations up to 4.9 ppm were recorded at the visitor viewpoint this week. The NOVAC station measured 112 ± 61 t/d of SO2. No SO2 plume has been detected in the atmosphere by the Sentinel-5P satellite since October 17. The lake level has decreased by about 0.2 m this week.
Source : Ovsicori .
Photos : Chris Allen / Sunquest helitours / RSN ( 2019) , Ovsicori.
La Guadeloupe , La Soufrière :
Press release from the Institut de physique du globe de Paris, Observatoire volcanologique et sismologique de Guadeloupe
Sunday, October 27, 2024 – 6:30 p.m. local time – 10:30 p.m. UTC
Sequence of earthquakes in the La Soufrière area of Guadeloupe – Basse Terre
The sequence of volcanic earthquakes that began on Friday, October 25, 2024 at 3:30 a.m. local time (7:30 a.m. universal time, UT*) in the area of the Soufrière volcano ended on Saturday, October 26, 2024 at 1:10 p.m. local time (5:10 p.m. universal time, UT*)
During this sequence, the OVSG-IPGP networks recorded 160 earthquakes of very low magnitude (M < 1). No earthquakes were reported as felt. The events are located at a depth of < 2.5 km below the summit of the La Soufrière dome.
The alert level remains: yellow, vigilance.
Source et photo : Direction de l’OVSG-IPGP
