Report on Popocatepetl (Mexico) — 21 March-27 March 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
21 March-27 March 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Popocatepetl (Mexico). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 21 March-27 March 2001. Smithsonian Institution and US Geological Survey.
19.023°N, 98.622°W; summit elev. 5393 m
All times are local (unless otherwise noted)
According to CENAPRED, volcanic activity remained low and relatively unchanged throughout 22-27 March. Low-intensity steam-and-gas exhalations continued, sometimes with small amounts of ash. Spoardic episodes of harmonic tremor were reported on most days, with the longest episode lasting 1.5 hours on the evening of 24 March. The volcano remained at Alert Level Yellow Phase III, with a restricted 12-km-radius area.
Geological Summary. Volcán Popocatépetl, whose name is the Aztec word for smoking mountain, rises 70 km SE of Mexico City to form North America's 2nd-highest volcano. The glacier-clad stratovolcano contains a steep-walled, 400 x 600 m wide 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 to the south. The modern volcano was constructed south of the late-Pleistocene to Holocene El Fraile cone. Three major Plinian eruptions, the most recent of which took place about 800 CE, have occurred 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 Pre-Columbian time.