July 4 , 2025 .
Japan , Shinmoedake :
Mount Shinmoe in southwestern Japan spews ash at 5,000 meters
July 3, 2025 (Mainichi, Japan)
MIYAZAKI, Japan (Kyodo) — Mount Shinmoe, an erupting volcano in southwestern Japan, was observed spewing an ash plume 5,000 meters above its crater, the Japan Meteorological Agency said Thursday.
Ash from the volcano, which straddles Kagoshima and Miyazaki prefectures on Kyushu Island, last reached such a height in April 2018.
Mount Shinmoe erupted on June 22 for the first time in seven years, dumping a significant amount of ash on the nearby town of Takaharu in Miyazaki Prefecture.
At a meeting of the government’s Volcanic Research Committee held the same day, experts reported massive emissions of volcanic gases. Although crustal movements suggested deep-seated swelling, an analysis of the volcanic ash revealed that no new magma eruptions had occurred.
The agency raised the alert level to 3 on a five-level scale the next day, urging people to stay away from the mountain. The level has remained unchanged since.
Sources : The Mainichj ,
Photo : Via Alex Terry / FB.
Indonesia , Dukono :
Mount Dukono erupted on Friday, July 4, 2025, at 6:30 a.m. (local time). The observed ash column reached ± 1,500 m above the summit (± 2,587 m above sea level). The ash column was white to gray, with a strong intensity, oriented toward the east. At the time of this report, the eruption was still ongoing.
Seismicity Observation:
104 eruption earthquakes with an amplitude of 6 to 34 mm and a duration of 32.76 to 97.89 seconds.
1 continuous tremor with an amplitude of 1 to 4 mm, with a dominant value of 2 mm.
Recommendations
(1) Residents and visitors/tourists are advised not to engage in any activities, climb, or approach the Malupang Warirang crater within a 4 km radius.
(2) Given that volcanic eruptions are periodic and ash distribution follows wind direction and speed, and the ash accumulation area is not fixed, residents of Mount Dukono are advised to always wear masks/nose and mouth coverings for use when needed to avoid any risk of volcanic ash being projected onto the respiratory tract.
Source et photo : Magma Indonésie .
Colombia , Puracé – Los Coconucos volcanic chain :
Popayán, July 1, 2025, 3:00 p.m.
Regarding 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 June 24-30, 2025, seismic activity recorded a slight increase compared to the previous week, particularly with regard to fluid dynamics.
Earthquakes associated with rock fracturing were located mainly between the Puracé and Piocollo volcanoes, at depths between 1 and 3 km, reaching a maximum magnitude of 1.1. The remaining seismic activity was concentrated distally to the west and northeast of the Puracé volcano, at distances between 10 and 13 km from the crater. Fluid-driven earthquakes were located beneath the crater of the Puracé volcano, at a depth of less than 1 km, and are characterized by their low energy input.
Satellite and ground-based detection instruments recorded moderate levels of sulfur dioxide (SO₂) and carbon dioxide (CO₂) emissions. Furthermore, the slow deformation process continued between the Puracé, Piocollo, and Curiquinga volcanic edifices.
Images captured by visible and infrared webcams continued to reveal degassing processes and thermal anomalies within the crater of Puracé Volcano and in the fumarole field on the outer rim of the crater, respectively. In conclusion, continuous degassing from the crater of Puracé Volcano continued throughout the week, accompanied by moderate emissions of SO₂ and CO₂, localized seismic activity beneath the structures of the Puracé and Piocollo volcanoes, and slow ground deformation, indicating the persistence of an active volcanic system.
Based on the above, the SGC recommends closely monitoring the evolution of volcanic activity through weekly and special bulletins, in addition to information published through official channels, and following the instructions of local and departmental authorities and the National Disaster Risk Management Unit (UNGRD). The alert status for volcanic activity remains yellow: active volcano showing changes in the behavior of the base level of monitored parameters and other manifestations.
Source et photo : SGC. ( Capture d’écran 4 Juillet 2025)
La Réunion , Piton de la Fournaise :
Paris Institute of Earth Physics, OVPF, Monthly Bulletin – June 2025 / Piton de la Fournaise Volcanological Observatory – IPGP
Seismicity
In June 2025, the OVPF-IPGP recorded a total of the following in the Piton de la Fournaise massif:
• 10 shallow volcano-tectonic earthquakes (0 to 2.5 km above sea level) beneath the summit craters;
• 4 deep earthquakes (below sea level);
• 3 long-period earthquakes;
• 74 rockfalls.
The month of June 2025 was marked by low seismicity beneath Piton de la Fournaise, with only 10 shallow volcano-tectonic earthquakes and 4 deep earthquakes recorded. Only two shallow volcano-tectonic earthquakes and one deep one could be located, respectively under the summit craters and the eastern flank. The others – of lower magnitude – could not be located.
Numerous (74) landslides in the Dolomieu Crater, at the ramparts of the Enclos Fouqué and at the Cassé de la Rivière de l’Est were also recorded.
Deformation
After resuming in February 2024, the edifice’s inflation stopped at the beginning of April 2024. Since then, a slight deflation has been observed over the long term, particularly clearly visible at the summit stations. By May 2025, deflation appears to have slowed. In the absence of data from two of the summit stations and from the distant baselines (consequences of damage caused by Cyclone Garance on February 28, 2025), this trend remains to be confirmed in the coming weeks.
Summary
Since April 2024, magma replenishment and pressurization of the shallow reservoir have ceased.
In June 2025, seismicity remained low, with only 10 shallow volcano-tectonic earthquakes and 4 deep earthquakes recorded. A slight summit deflation is still observed, while a new pulse in soil CO2 emissions is recorded at distal sites since June 2025
Source et photo : OVPF.
Costa Rica , Poas :
Latitude: 10.20°N;
Longitude: 84.23°W;
Altitude: 2,687 m
Current Activity Level: Caution
Following the May 19 eruption, no further explosive events have been recorded. However, weak ash emissions were observed last week.
This week, the amplitude of the continuous seismic tremor remains low and stable compared to recent months. Acoustic tremor remains generally stable, with some temporary increases associated with weak ash emissions. The number of long-period events has increased compared to last week. This week, a single volcano-tectonic event was recorded in the Poás edifice.
In recent weeks, uplift and expansion of the crater have ceased, and no significant deformation is currently observed on the geodetic network.
The average SO2 flux over the past week was 352 ± 48 t/d. The mass of SO2 measured in the atmosphere of Costa Rica by the TROPOMI sensor on the Sentinel-5P satellite remained high, with values frequently exceeding 500 tonnes and reaching 900 tonnes on June 26.
The MultiGAS station located near Boca A measured an average SO2/CO2 ratio of 1.5 ± 0.7 this week, similar to last week, compared to values of 3 to 4 in May. The H2S/SO2 ratio has remained very low (< 0.1) in recent weeks. The gases are interpreted to be coming from a surface magmatic source, but the magmatic input has decreased. The level of the new Boca C lake continues to rise, particularly between June 24 and 26, in connection with the heavy rains of June 25 (123 mm according to the IMN). Boca A remains dry, with incandescence at night, except for the night of June 25 to 26, probably due to the strong evaporation of the water that entered in the afternoon.
Source : Ovsicori .
Photo : RSN-UCR ( archive Juin 2025)
