Wed, 27 Dec 2000, 06:00
CENAPRED reported that low-intensity exhalations occurred during most of the week. At 1118 on 30 December an intense seismic signal was recorded for 4 minutes that was characteristic of exhalations with explosive initial phases. At 1955 on 30 December a pilot report stated that an eruption sent an ash cloud to 8.5 km a.s.l.
Wed, 20 Dec 2000, 06:00Volcanic activity at Popocatépetl decreased in comparison to last week. The Washington VAAC reported that during 21 to 25 December there were intermittent emissions of mostly steam. In addition, several small-to-moderate explosive events occurred during the week; at 1555 on 24 December ash was erupted to ~9 km a.s.l. and then blown to the E; at 1045 on 25 December ash was erupted to between 5.5 and 7.6 km a.s.l., blown to the NE, and deposited less than 5 km from the summit; and moderate exhalations occurred at 0111 and 0631 on 27 December that sent ash up to 7.6 and 9.8 km, respectively.
Wed, 13 Dec 2000, 06:00
For the first time in 6 years, continuous-fountaining Strombolian-style eruptions of incandescent spatter occurred at Popocatépetl, marking a significant change in eruption behavior. In addition, strong harmonic tremor and high-mass flux rates have occurred. As of the end of the report period, the summit crater contained hot lava, and continuous ash emissions deposited ash in several towns surrounding the volcano.
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Wed, 6 Dec 2000, 06:00A reduction in volcanic activity at Popocatépetl led CENAPRED to reduce the Alert Level on 6 December from Yellow Phase III to Phase II, thus reducing the high-risk zone from 10 to 7 km. The Washington VAAC reported that a small steam-and-ash exhalation sent an ash cloud to ~6.7 km a.s.l. at ~2034 on 6 December.
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Wed, 29 Nov 2000, 06:00
Volcanic activity continued at a high rate at Popocatépetl, with several small-to-moderate exhalations and eruptions. Remote-sensing data, aviation sources, and CENAPRED provided more details. One of the larger series of eruptions occurred during 0900 to 1215 on 29 November, sending ash-and-steam plumes to ~7.3 km a.s.l to the ENE.
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Wed, 22 Nov 2000, 06:00Volcanic activity continued at a high rate at Popocatepetl, with several small-to-moderate exhalations and eruptions. Remote-sensing and aviation sources provided more details. The Mexico City MWO reported to the Washington VAAC that three exhalations at 0419, 0421, and 0500 on 21 November sent ash to 5-7 km a.s.l.
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Wed, 15 Nov 2000, 06:00
Volcanic activity continued at a high rate at Popocatepetl, with several small-to-moderate exhalations. The Mexico City MWO and the Washington VAAC reported that at 0947 on 14 November a small ash-and-steam exhalation produced a cloud that was visible on GOES-8 imagery; it reached an altitude of ~8 km a.s.l. The cloud rapidly dissipated as it moved briefly to the NNE.
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Wed, 8 Nov 2000, 06:00During the week volcanic activity was high at Popocatepetl, with several exhalations and eruptions. CENAPRED reported that exhalations at 1456 and 1541 on 7 November sent ash clouds to 2 and 4.5 km above the volcano, respectively. The Mexico City MWO reported to the Washington VAAC that an ash-and-steam exhalation at 1150 on 9 November sent ash to ~9.5 km a.s.l.
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Wed, 1 Nov 2000, 06:00
The Washington VAAC, Mexico MWO, and CENAPRED reported that a series of small eruptions occurred during 1715-1806 on 1 November. GOES-8 imagery showed that ash rose to between 6 and 7 km a.s.l. and extended to the NNE.
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