October 27 , 2025.
Hawaii , Kilauea :
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE , U.S. Geological Survey
Sunday, October 26, 2025, 9:06 AM HST (Sunday, October 26, 2025, 19:06 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
During the lapse in appropriations, the USGS Hawaiian Volcano Observatory (HVO) continues to maintain monitoring networks and issue updates and notifications of volcanic activity via the Hazard Notification Service. Volcano monitoring data will continue to be available on the HVO website. Static website content will not be updated until further notice and information may become outdated over time.
Activity Summary:
Episode 35 of the ongoing Halemaʻumaʻu eruption ended on October 18 after 7.5 hours of continuous lava fountaining. Both vents continue to exhibit incandescence. Kīlauea summit inflation continues along with seismic tremor and vent glow indicating that another lava fountaining episode is probable. Models suggest a likely forecast window of November 5–11 for episode 36 with November 6-9 most probable.
Summit Observations:
The north and south vents roughly alternated periods of moderate to bright glow overnight with flames frequently observed from the north vent during bright glow. Secondary lava flow movement after episode 35 is not apparent.
The summit continues to inflate. The Uēkahuna tiltmeter (UWD) has recorded just under 1.1 microradians of inflationary tilt over the past 24 hours and just over 15.5 microradians of inflationary tilt since the end of episode 35. Tremor patterns continue with defined peaks spaced 5-10 minutes apart that correlate well with the alternating periods of glow from both vents. This pattern indicates that strong gas pistoning is occurring within the vents and the alternating patterns indicate the vents are probably coupled.
Plumes of gas continue from both vents this morning and sulfur dioxide (SO2) gas emissions remain at background levels, typically between 1,200 and 1,500 tonnes per day.
Source : HVO.
Costa Rica , Rincon de la Vieja :
Latitude: 10.83°N;
Longitude: 85.34°W;
Altitude: 1,916 m.
Current Activity Level: Alert.
Five small eruptions and one exhalation were recorded this week. Friday, October 19, was the most intense eruption of the week, with no lahars. However, this eruption was not the most intense of the year. The background tremor varied in amplitude and frequency throughout the week, with a decreasing trend since October 13. Brief pulses of higher amplitude tremor and a sequence of banded tremor have also been observed since October 21. The characteristic pattern of these eruptions is associated with a decrease in tremor amplitude, which could indicate the partial closure of cavities or conduits causing an accumulation of volcanic gases and generating phreatic eruptions.
Long-period « tornillo » events and sporadic earthquakes continue to occur near the crater. Geodetic observations show a contraction of the base and a cessation of summit movement toward the crater. This week, DOAS stations recorded an increase in SO₂ flux (142 ± 125 t/d) compared to the previous week (51 ± 10 t/d). The MultiGAS station measured SO₂ concentrations up to 5.7 ppm this week. The H₂S/SO₂ ratio ranged from 1.5 to 0.1, and the CO₂/SO₂ ratio ranged from 26 to 6. The last detection of SO₂ in the atmosphere by satellite measurement was on September 7.
Source et photo : Ovsicori.
Ecuador , El Reventador :
DAILY STATUS REPORT OF REVENTADOR VOLCANO, Sunday, October 26, 2025.
Information Geophysical Institute – EPN.
Surface Activity Level: High, Surface Trend: No Change
Internal Activity Level: Moderate, Internal Trend: No Change
From October 25, 2025, 11:00 AM to October 26, 2025, 11:00 AM:
Seismicity:
Below is the count of seismic events recorded at the reference station.
Explosion (EXP) 48
Long Period (LP) 10
Emission Tremor (TREMI) 5
Harmonic Tremor (TRARM) 3
Rainfall / Lahars:
Last night, rains affected the volcano, resulting in the recording of signs associated with the descent of mudflows, or lahars, of low to moderate intensity, in the ravines east of the volcano. It is recommended to stay away from the ravine channels and rivers of the volcano. This phenomenon is due to heavy rains washing away sediments in the upper part of the volcano.
Emissions / Ash Column:
Since yesterday afternoon, surveillance cameras have observed several gas and ash emissions at heights between 700 and 1,300 meters above the crater, in a west and northwest direction. In connection with this activity, the Washington VAAC agency has issued three reports of ash clouds in a northwest and west direction, reaching up to 1,000 meters above the crater.
Gas:
The MOUNTS satellite system reported 18.6 tons of sulfur dioxide (SO2), measured yesterday, 10/25/2025 at 1:21 PM LT.
Observation:
Last night and early this morning, surveillance cameras recorded several episodes of incandescent material falling on the flanks of the volcano, up to 1,100 meters below the crater level. At the time of writing, the volcano remains partially clear.
Alert Level – SGR: Orange
Source : IGEPN
Photo : Guia fotografica / FB.
Kamchatka , Klyuchevskoy :
VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
Issued: October 27 , 2025
Volcano: Klyuchevskoy (CAVW #300260)
Current aviation colour code: GREEN
Previous aviation colour code: yellow
Source: KVERT
Notice Number: 2025-127
Volcano Location: N 56 deg 3 min E 160 deg 38 min
Area: Kamchatka, Russia
Summit Elevation: 4750 m (15580 ft)
Volcanic Activity Summary:
The explosive-effusive eruption of the Klyuchevskoy volcano, which lasted from 20 April to 16 August, 2025, has ended, but a gas-steam activity of the volcano continues. According to KVERT visual and satellite data, a large thermal anomaly associated with the cooling of the lava flow was observed on the western slope of the volcano. KVERT continues to monitor Klyuchevskoy volcano.
A gas-steam activity of the volcano continues. Ongoing activity could affect low-flying aircraft.
Volcanic cloud height: NO ASH CLOUD PRODUSED
Other volcanic cloud information: NO ASH CLOUD PRODUSED
Source et photo : Kvert
Guatemala , Fuego :
Weather Conditions: Clear
Wind: Northeast
Precipitation: 26.2 mm
Activity
10 to 15 weak and moderate explosions are recorded per hour, projecting columns of gas and ash up to an altitude of 4,500 to 4,800 meters (14,764 to 15,748 feet). These columns then move 10 to 30 km to the west and southwest. Fine ashfall is expected on communities located near the volcano in this direction. Weak and moderate rumbling sounds and shock waves are also generated, vibrating the roofs and windows of nearby communities.
Some explosions project incandescent material up to 250 meters above the crater. As it descends, it covers the entire summit of the volcanic edifice and is eventually channeled through various ravines to the edge of the vegetation.
Precipitation around the volcanic edifice can generate currents and/or lahars in the volcano’s various ravines. It is recommended not to stay in or near these ravines, especially in the afternoon and evening.
Source : Insivumeh.
Photo : Diego Rizzo .
