This report is updated weekly but volcanic activity can change rapidly. The plume top was situated at 4,300-5,740 m altitude and traverses beneath the plume were made at altitudes between 3,000 and 4,545 m. The plume was identified and two navigational bench marks were placed using the aircraft's global positioning system (GPS) to assure that the traverses were perpendicular to the plume's axis. As many as six a day were reported during the second week of the month. Incandescence from the crater at night was noted. Notice the gas-laden plume being dispersed by predominant winds to the NE. Ashfall was reported in San Martín Texmelucan, San Matías Tlalancaleca, San Salvador el Verde, Santa Rita Tlahuapan, Tlaltenango, Huejotzingo, San Miguel Xoxtla, Domingo Arenas, Santa María Atexcac, and the Puebla airport. During a flight on 4 March to measure CO2 volumes, gas and light ash could be seen emanating from the crater. Volcanic bombs have impacted the immediate summit area of the volcano as well as locations as distant as 3.7 km (the maximum distance considered in the simulations). The lake's pH was 2-2.7 and the temperature was 30°C. No significant deformation was observed. The activity has not shown any significant changes. . Information Contacts: Carlos Valdés González, Roberto Quass Weppen, Gilberto Castelan, Enrique Guevara Ortiz, and Angel Gómez-Vázquez, Centro Nacional de Prevención de Desastres (CENAPRED), Av. The plumes occasionally contained slight amounts of ash on 20 and 21 October. For more information about the present state of the volcano and the return of evacuees to their homes refer to CENAPRED's 26 December Bulletin. At 0920 on 27 August two small ash emissions caused light ashfall over several towns on the W flank. Except for two A-type events on 2 April, no A- or AB-type events were detected. For example, during 12-17 June 2013, plumes containing ash rose as high as 4 km above the crater, and ashfall was reported in many nearby villages (figure 68). An explosion at 0111 on 26 October ejected tephra 200 m onto the N flank. During 7-8 October 2014 ashfall was reported in Cuautla (43 km SW), Tetela del Volcán (20 km SW), Huaquechula (30 km SSW), and Morelos (60 km SW). After this event a small amount of ash fell in the town of Puebla, ~50 km E of the volcano. Estimates of Popocatépetl dome volumes for the stated dates.

Information Contacts: Roberto Meli, Roberto Quaas Weppen, Alejandro Mirano, Bertha López Najera, Alicia Martinez Bringas, A. Montalvo, G. Fregoso, and F. Galicia, Centro Nacional de Prevencion de Desastres (CENAPRED); J.L. A minor eruption at 1212 on 27 January produced an ash cloud that rose to 6.4 km a.s.l. At 0026 the next morning a low-intensity explosion generated an ash plume that rose 500 m and drifted NE. At 1215 an ~18-m-wide plume was visible on satellite imagery reaching ~2.4 km above the summit and extending 50 km from the volcano. A second explosive exhalation occurred later that day at 1142 although no incandescent fragments were confirmed. The volcano remained at Alert Level Yellow Phase III, with a restricted 12-km-radius area. A small crater surrounded by a tuff cone composed of light-brown to gray silty-sandy ash occupied the site of the former lake. Low-amplitude harmonic tremor 3-5 minutes in duration occurred in the afternoon. Cloud cover sometimes prevented observations, though gas-and-steam plumes were visible almost daily. Coyoacan, México D.F. A dilute white column, roughly the diameter of the summit crater, could be seen gently rising from the crater. Stoiber, R.E., Malinconico, Jr., L.L., and Williams, S.N., 1983, Use of the correlation spectrometer at volcanoes, in Forecasting Volcanic Events, H. Tazieff and J.C. Sabroux (eds. Low-intensity explosions were detected on 17 and 19 October. Larger explosive eruptions were recorded in 1519 and possibly 1663. On 7 January, as viewed from towns at the volcano s base (such as Amecameca and Atlautla), strong fumarolic activity continued from the crater. 04360, México (URL: Geol Soc Amer Bull, 111: 1550-1562. It appeared to rise a few hundred meters above the crater, before being blown by the wind. The last significant activity took place from 1920-22.

An explosion on 12 August generated an ash plume that rose 2.5 km above the crater and drifted WNW, causing ashfall in Ozumba (18 km W) and Atlautla (16 km W). Four small eruptions also occurred during the day.

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