Kategorie: Climate Change

The effusive activity at Bagana volcano since July 2025, including the latest lava flow from 17 December (image: Sentinel-2)

The effusive eruption at the volcano continues.

The latest Sentinel-2 acquisition over the volcano on 17 December confirmed that a new lava flow arm started to descend from the summit vent towards the western flank.

Satellite image of Semeru volcano on 17 Dec 2025

Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 and is moving at 10 kts in E direction.
The full report is as follows:

FVAU02 at 00:59 UTC, 17/12/25 from ADRM
VA ADVISORY
DTG: 20251217/0100Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2025/1435
INFO SOURCE: CVGHM, HIMAWARI-9, WEBCAM
ERUPTION DETAILS: VA LAST REPORTED AT 17/0031Z
OBS VA DTG: 17/0040Z
OBS VA CLD: SFC/FL140 S0809 E11251 – S0801 E11252 – S0754
E11322 – S0818 E11320 MOV E 10KT
FCST VA CLD +6 HR: 17/0640Z SFC/FL140 S0808 E11251 – S0801
E11252 – S0758 E11322 – S0821 E11319
FCST VA CLD +12 HR: 17/1240Z SFC/FL140 S0808 E11251 – S0801
E11253 – S0802 E11323 – S0824 E11317
FCST VA CLD +18 HR: 17/1840Z SFC/FL140 S0808 E11250 – S0801
E11253 – S0807 E11324 – S0826 E11317
RMK: WEAK VA EMISSIONS OBS ON SATELLITE MOVING E TO NE.
GROUND REPORTS INDICATE INTERMITTENT DISCRETE EMISSIONS
REMAIN ONGOING. VA HEIGHT AND MOVEMENT BASED ON GROUND
REPORTS AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20251217/0700Z=

The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that the eruption continued at Dukono on 15 December 2025 (local). The alert level remained at „Level 2 – Alert“ (on a 4-level scale).
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)

Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)
Aviation Alert Level: unavailable or not collected

Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Dec 15, 2025

Volcanic Ash Advisory Center Darwin (VAAC) issued the following report:

FVAU02 at 18:58 UTC, 16/12/25 from ADRM
VA ADVISORY
DTG: 20251216/1900Z
VAAC: DARWIN
VOLCANO: SEMERU 263300
PSN: S0806 E11255
AREA: INDONESIA
SOURCE ELEV: 3657M AMSL
ADVISORY NR: 2025/1434
INFO SOURCE: CVGHM, HIMAWARI-9, WEBCAM
ERUPTION DETAILS: ERUPTION LAST REPORTED AT 16/1620Z
EST VA DTG: 16/1840Z
EST VA CLD: SFC/FL140 S0806 E11251 – S0801 E11254 – S0805
E11323 – S0823 E11314 MOV SE 05KT
FCST VA CLD +6 HR: 17/0040Z SFC/FL140 S0806 E11252 – S0801
E11254 – S0806 E11323 – S0821 E11314
FCST VA CLD +12 HR: 17/0640Z SFC/FL140 S0806 E11252 – S0801
E11254 – S0806 E11323 – S0822 E11314
FCST VA CLD +18 HR: 17/1240Z SFC/FL140 S0805 E11251 – S0801
E11254 – S0809 E11322 – S0823 E11313
RMK: VA NOT IDENTIFIABLE ON LATEST SATELLITE IMAGE DUE TO
MET CLOUD. GROUND REPORTS INDICATE INTERMITTENT DISCRETE
EMISSIONS REMAIN ONGOING. VA HEIGHT AND MOVEMENT BASED ON
GROUND REPORTS AND MODEL GUIDANCE.
NXT ADVISORY: NO LATER THAN 20251217/0100Z=

Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 18000 ft (5500 m) altitude or flight level 180 .
The full report is as follows:

FVXX24 at 15:29 UTC, 16/12/25 from KNES
VA ADVISORY
DTG: 20251216/1526Z

VAAC: WASHINGTON

VOLCANO: PURACE 351060
PSN: N0219 W07624

AREA: COLOMBIA

SOURCE ELEV: 15256 FT AMSL

ADVISORY NR: 2025/095

INFO SOURCE: GOES-19. VONA. NWP MODELS.

ERUPTION DETAILS: VA EM DETECTED

OBS VA DTG: 16/1450Z

OBS VA CLD: SFC/FL180 N0238 W07638 – N0219 W07623
– N0218 W07624 – N0230 W07646 – N0238 W07638 MOV
NW 10KT

FCST VA CLD +6HR: 16/2100Z SFC/FL180 N0240 W07646
– N0219 W07623 – N0217 W07624 – N0230 W07653 –
N0240 W07646

FCST VA CLD +12HR: 17/0300Z SFC/FL180 N0235
W07650 – N0220 W07622 – N0217 W07624 – N0223
W07655 – N0235 W07650

FCST VA CLD +18HR: 17/0900Z SFC/FL180 N0226
W07655 – N0220 W07624 – N0217 W07623 – N0213
W07655 – N0226 W07655

RMK: VONA RCVD FOR SEISMIC ACT INT VA EM. VA ALSO
OBS IN STLT IMG MOVNG NW AT APX 25 NMI FM SUMMIT.
EXP MOVNT SHIFT FM NW TO W THRU T+18 HRS. FL BSD
ON PST ACT. FCST BSD ON NWP MDLS. …LINER

NXT ADVISORY: WILL BE ISSUED BY 20251216/2130Z