January 29 , 2025.
Hawaii , Kilauea :
Monday, January 27, 2025, 7:46 PM HST (Tuesday, January 28, 2025, 05:46 UTC)
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:
Episode 7 of the ongoing Halemaʻumaʻu eruption began at 6:41 pm HST on January 27 and is currently feeding a small flow onto the crater floor.
Episode 7 was preceded by small, sporadic spatter fountains that began at approximately 1:30 p.m. and continued to increase in intensity until 6:41 p.m., when sustained fountaining began. Fountains from the north vent are 100-120 feet (30-40 meters) high and feeding multiple lava streams at 7:40 pm HST. The flow had covered 15-20% of the crater floor this time. A small fountain can be seen in the south vent and there is a small lava flow emerging from the south side of its cone at 7:35 p.m. HST on webcams.
Inflationary tilt at the summit recovered the 2.5 microradian tilt loss during episode 6 by 3:00 p.m. on January 27 and had increased another 0.5 microradians just before episode 7 started. Seismic tremor began increasing and tilt at UWD switched from inflation to deflation at about 6:40 p.m. about the same time lava flows began erupting onto the crater floor.
No changes have been detected in the East Rift Zone or Southwest Rift Zone.
Each episode of lava fountaining since December 23, 2024, has continued for 13 hours to 8 days and episodes have been separated by pauses in eruptive activity lasting a less than 24 hours to 12 days. Based on the durations of episodes 5 and 6 and the short pauses that separated them, episode 7 will probably last 10-20 hours.
Tuesday, January 28, 2025, 12:22 PM HST (Tuesday, January 28, 2025, 22:22 UTC)
Activity Summary:
Episode 7 of the ongoing Halemaʻumaʻu eruption ended abruptly at 10:47 a.m. HST on January 28.
The southern vent stopped erupting just after 10:43 a.m. HST followed shutdown of the north vent at 10:47 a.m. HST. Lava flows from this episode covered more than half of the floor of Halemaʻumaʻu within the southern part of Kaluapele (Kīlauea caldera).
Telephoto view of both eruptive vents in the Kīlauea Halema‘uma‘u eruption during episode 7 on January 28, 2025. Both vents reactivated during this episode. The north vent (upper left vent) fountain produced lava channels outpouring from its base but also out the sides of the vent as seen in this photo. A small channel flows from the north vent towards the south vent.
Deflationary tilt at the summit recorded about 7 microradians during episode 7, more than twice that recorded during episodes 5 and 6. The end of the eruption was coincident with a rapid change from deflation to inflation at the summit and a decrease in seismic tremor intensity.
No changes have been detected in the East Rift Zone or Southwest Rift Zone.
Each episode of Halemaʻumaʻu lava fountaining since December 23, 2024, has continued for 13 hours to 8 days and episodes have been separated by pauses in eruptive activity lasting less than 24 hours to 12 days.
HVO continues to closely monitor Kīlauea and will issue an eruption update tomorrow morning unless there are significant changes before then.
Source : HVO
Photo : USGS , USGS / H. Winslow.
Italy , Stromboli :
WEEKLY BULLETIN, from January 20, 2025 to January 26, 2025. (issue date January 28, 2025)
SUMMARY OF ACTIVITY STATUS
In light of the monitoring data, it is highlighted:
1) VOLCANOLOGICAL OBSERVATIONS: During the period studied, intense eruptive activity with splashes from the North Crater area was observed. The total hourly frequency of explosions varied between medium (8 events/hour) and high (16 events/hour) values. The intensity was low and medium in the North and Center-South Crater areas.
2) SEISMOLOGY: The monitored seismic parameters do not show significant variations.
3) GROUND DEFORMATIONS: The island’s ground deformation monitoring networks did not show significant variations to report for the period examined.
4) GEOCHEMISTRY: SO2 flux at medium level.
Soil CO2 flux from the Pizzo area (STR02): remains at high values
CO2/SO2 ratio in the plume (Stromboli Plume Network): high values
Helium isotope ratio (R/Ra) dissolved in the thermal aquifer: last updated on 19 December 2024, high values
Soil CO2 flux in the San Bartolo area at medium values.
Soil CO2 flux in the Scari area at medium-high values.
5) SATELLITE OBSERVATIONS: The thermal activity observed by satellite in the summit area was generally low level with some isolated thermal anomalies of moderate level.
VOLCANOLOGICAL OBSERVATIONS
During the observation period, the eruptive activity of Stromboli was characterized by the analysis of the images recorded by the INGV-OE surveillance cameras placed at an altitude of 190 m (SCT-SCV) and at Punta dei Corvi (SPCT). The explosive activity was produced mainly by 4 eruptive vents located in the North crater area and by 3 vents located in the Centre-South crater area.
Due to unfavorable weather conditions, the visibility of the crater terrace on 24 January was insufficient for a correct description of the eruptive activity.
Observations of explosive activity captured by surveillance cameras
In the North Crater (N) area, four active vents were observed that produced low-intensity explosive activity (erupted products reached a height of less than 80 m) and sometimes medium-intensity (product height between 80 and 100 m). m). In addition, splashing activity was observed at the vents in sector N2, which was intense on 22 and 26 January. The emitted products consisted mainly of coarse materials (bombs and lapilli). The average explosion frequency ranged from 7 to 11 events per hour.
In the Centre-South (CS) area, explosive activity was produced by at least three vents; the explosions were of medium intensity (product height between 80 and 150 m) and sometimes strong (more than 250 m in height) with emission of fine material. The average frequency of explosions varied between 1 and 5 events per hour.
Source : INGV
Photo : Stromboli stati d’animo / Sebastiano Cannavo
Colombia , Puracé / Los Coconucos volcanic chain :
Popayán, January 28, 2025, 4:30 p.m. .
Following the monitoring of the activity of the Puracé volcano – Los Coconucos volcanic chain, the Colombian Geological Survey (SGC), an entity attached to the Ministry of Mines and Energy, reports that:
During the week of January 21 to 27, 2025, seismic activity decreased both in the number of events and in the energy released compared to the previous week.
The events occurred, for the most part, in the northwest part of the volcanic chain.
The earthquakes related to rock fracturing had depths between 1 and 3 km with a maximum recorded magnitude of 1.5 ML, corresponding to an earthquake that occurred at 11:32 p.m. (local time) on January 22.
The fluid events, on the other hand, had depths less than 2 km. On the 21st, 22nd and 23rd, a continuous tremor signal was recorded, associated with degassing processes from the Puracé and Curiquinga emission sources. The calculated values of the sulfur dioxide (SO2) flux decreased compared to the previous week, although they remain above baseline levels. The slow deformation process between the Puracé, Piocollo and Curiquinga volcanic buildings continues to be recorded.
No changes were observed in the fumarole fields in the images captured by the visible and infrared spectrum webcams. In addition, significant degassing was observed in the lateral fumarole of the Puracé volcano crater and in the fissure system that extends between the Curiquinga and Piocollo volcanoes. By analyzing satellite images taken on January 23, it was possible to establish that the system of cracks and cavities formed during the ash emission of January 20 reaches a length of almost 280 m.
Based on the above, the SGC recommends closely monitoring the evolution of volcanic activity through weekly bulletins and other information published on official channels, as well as complying with the instructions of local, departmental authorities and the National Disaster Risk Management Unit (UNGRD).
The alert status for volcanic activity remains at yellow alert status: active volcano with changes in the behavior of the base level of monitored parameters and other manifestations.
Source : SGC
Photo : Cric-colombia .org
Alaska / Aleutians , Okmok :
AVO/USGS Volcanic Activity Notice
Current Volcano Alert Level: UNASSIGNED
Previous Volcano Alert Level: NORMAL
Current Aviation Color Code: UNASSIGNED
Previous Aviation Color Code: GREEN
Issued: Tuesday, January 28, 2025, 5:01 PM AKST
Source: Alaska Volcano Observatory
Notice Number: 2025/A57
Location: N 53 deg 23 min W 168 deg 9 min
Elevation: 3520 ft (1073 m)
Area: Aleutians
Volcanic Activity Summary:
The Alaska Volcano Observatory (AVO) equipment that transmits real-time seismic data from stations in the Okmok volcano monitoring network has experienced significant degradation over the past several days. A few channels are still being transmitted but are not sufficient to establish that the volcano is at a typical background level. AVO estimates that the outage will likely last several weeks or longer. As a result, AVO is unable to (1) assess whether this volcano may be building towards an eruption and (2) quickly confirm or dismiss reports of activity.
Because this volcano is no longer monitored at adequate levels, the Aviation Color Code and Volcano Alert Level are changed to UNASSIGNED/UNASSIGNED. As at other volcanoes without real-time seismic networks, AVO will continue to use satellite data, regional seismic, infrasound and lightning networks, and reports from pilots and ground observers to detect signs of eruptive activity.
Remarks:
Okmok volcano is a 6-mile-wide caldera that occupies most of the eastern end of Umnak Island, located 75 miles southwest of Unalaska/Dutch Harbor in the eastern Aleutian Islands. Okmok has had several eruptions in historic time typically consisting of ash emissions occasionally to over 30,000 feet ASL but generally much lower; lava flows crossed the caldera floor in 1945 and 1958. Prior to 2008, the volcano last erupted in February 1997 producing lava flows and intermittent ash emissions over the course of several months. The nearest settlement is Nikolski, population about 35, roughly 45 miles west of the volcano.
Source : AVO
Photo : Mees, Burke 04/2021 ,
Indonesia , Ibu :
An eruption of Mount Ibu occurred on Tuesday, 28 January 2025, at 10:13 WIT with an observed ash column height of ± 500 m above the peak (± 1825 m above sea level). The ash column was observed to be grey in colour with a thick intensity, oriented towards the West. This eruption was recorded on a seismograph with a maximum amplitude of 28 mm and a duration of 51 seconds.
Volcano activity continues. Explosions at: 11:41, 15:12, 21:13, 21:23 etc….
Seismicity observation:
17 Eruption earthquakes with an amplitude of 23 to 28 mm and a duration of 40 to 85 seconds.
16 Emission earthquakes with an amplitude of 2 to 17 mm and a duration of 21 to 59 seconds.
8 harmonic tremors with an amplitude of 2 to 4 mm and an earthquake duration of 39 to 79 seconds.
73 Shallow volcanic earthquakes with an amplitude of 2 to 10 mm and a duration of 4 to 19 seconds.
1 deep volcanic earthquake with an amplitude of 3 mm, and an earthquake duration of 17 seconds.
4 Distant tectonic earthquakes with amplitudes of 7 to 24 mm, and earthquake duration of 45 to 92 seconds.
Recommendation
1. Communities around Mount Ibu and visitors/tourists should not carry out activities within a 4km radius with a 5km sectoral extension towards the crater opening in the northern part of the active crater of Mount Ibu.
2. In case of ash rain, people active outside the house are advised to use nose, mouth (mask) and eye (goggles) protection.
Source et photo : Magma Indonésie .
