Campi Flegrei (Phlegrean Fields) (Italy): A swarm of small earthquakes has been occurring under Europe’s most active caldera over the past day to hours.
The INGV seismic instrument recorded internal continuous vibrations (so-called tremor) beginning at 23:57 UTC last night. Earthquakes have been more frequent between Pozzuoli and Bagnoli areas today. About 120 quakes have been monitored within eight hours, of which one was located with a maximum magnitude of 3.6.
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Sakurajima (Kyushu, Japan): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA AT 20230818/0903Z 15NM SW OF RJFK FL040 EXTD NW
Mayon (Luzon Island, Philippines): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20230818/1025Z VA CLD UNKNOWN REPORTED OBS VA DTG:18/1020Z
Semeru (East Java, Indonesia): (18 Aug) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: VA TO FL150 MOV SW OBS VA DTG:18/0000Z to 15000 ft (4600 m)
Aniakchak (United States, Alaska Peninsula): (18 Aug) The Alaska Volcano Observatory (AVO) announced that monitored values of the volcano’s activity declined to background levels.
A number of earthquakes beneath the edifice and the recently detected uplift under the caldera decreased,
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Santiaguito (Guatemala): Mild explosive activity continues from the volcano. The Volcanic Ash Advisory Center (VAAC) Washington reported intermittent emissions of volcanic ash plumes.
The full report is as follows: sporadic emissions of volcanic ash
Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 17000 ft (5200 m) altitude or flight level 170 .
The full report is as follows: FRQ VA EMS OBSD to 17000 ft (5200 m)
Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 22000 ft (6700 m) altitude or flight level 220 .
The full report is as follows: CONS VA EMS OBSD to 22000 ft (6700 m)
Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
The full report is as follows: POSS VA EMS to 15000 ft (4600 m)
Sabancaya (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 25000 ft (7600 m) altitude or flight level 250 and is moving at 25 kts in N direction.
The full report is as follows: continuous ash emissions to 25000 ft (7600 m)
Ubinas (Peru): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Buenos Aires warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
The full report is as follows: continuous ash emissions to 20000 ft (6100 m)
Volcano Activity Summary for 18 Aug 2023:
