IG reported that during 7-13 October gas, steam, and ash plumes rose from Cotopaxi as high as 2.5 km above the crater and drifted NW, W, and SW. Ash fell on the N flank on 7 October. Ashfall was also reported in El Chasqui Chaupi, Machachi (24 km NW), Aloag (28 km NW), and Obelisco on 8 October, and in San Ramón, San Agustín, San Isidro (58 km N), Rumipamba de Espinosas (53 km NNW), Callo Mancheno, Santa Catalina (52 km N), and San Francisco on 13 October.
The activity in the last hours has been characterized by episodes of tremor.
Most of the time the volcano remained cloudy, but through the clouds, different emissions were observed with ash contents, especially in the afternoon, or the amount of ash emission was moderate. They reached an altitude of 1 km and were headed west; in this area, the staff of the Institute reported ash fall.
At midday, a small lahar on the slopes Northwest was recorded which caused no problem.
Technical and annexes observations:
From 06:00 (TL) to 17.00 (TL), 27 events volcano tectonic (VT), 5 events of tremor emission (TR) and 4 events long period (LP) were recorded.
Observations of emissions and ash:
In the morning, the volcano still partly cloudy, and the amount of ash in the emission was weak. However, during the emission of ash in the afternoon, which was moderate with a height of 1 km westward, staff working in this sector of the volcano reported ash fall.
The value of sulfur dioxide emissions is 1248 tons / day, with 34 valid measures.
Today, the rains were present on certain sectors of the volcano and about noon, a small lahar was generated on the north – west side, which caused no problem.
October 15, 2015. Cotopaxi, Ecuador :
Elevation 5911 m
Source : GVP , IGEPN
Photo : José Luis Espinosa Naranjo .