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Background:

Volcán Popocatépetl, whose name is the Aztec word for smoking mountain, towers to 5426 m 70 km SE of Mexico City to form North America’s 2nd-highest volcano.  The glacier-clad stratovolcano contains a steep-walled, 250-450 m deep crater.  The generally symmetrical volcano is modified by the sharp-peaked Ventorrillo on the NW, a remnant of an earlier volcano. 
At least three previous major cones were destroyed by gravitational failure during the Pleistocene, producing massive debris-avalanche deposits covering broad areas south of the volcano.  The modern volcano was constructed to the south of the late-Pleistocene to Holocene El Fraile cone.  Three major plinian eruptions, the most recent of which took place about 800 AD, have occurred from Popocatépetl since the mid Holocene, accompanied by pyroclastic flows and voluminous lahars that swept basins below the volcano.  Frequent historical eruptions, first recorded in Aztec codices, have occurred since precolumbian

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Mon, 22 Sep 2025, 06:00 1758520804 | BY: VN

Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20250921/2128Z FL140 EXTD W REPORTED OBS VA DTG:21/2120Z

Akan (Hokkaido): Between 11 and 15 September, the Japan Meteorological Agency (JMA) reported increasing unrest within the Akan volcanic complex.
Starting around on 11 September, the number of small earthquakes near Ponmachineshiri Crater began to rise, reaching 19–50 events per day and remaining elevated throughout the week.
… [read more]

Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
The full report is as follows: VA TO FL070 MOV N LAST REPORTED AT 22/0316Z to 7000 ft (2100 m)

Lewotolo (Lesser Sunda Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic

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