Nevados de Chillan (Chile) – Report for 2 June-8 June 2021

SERNAGEOMIN reported continuing explosive and effusive activity at Nevados de Chill�n?s Nicanor Crater during 16 May-2 June, and increased sulfur dioxide emissions and thermal anomalies. Explosions partly destroyed the dome, generating ash plumes that rose as high as 1.4 km above the crater rim and pyroclastic flows that traveled as far as 1.1 km down the NE flank. Satellite images indicated that the L5 lava flow did not lengthen, remaining at 966 m, though the distal part of the flow widened. The L6 lava flow advanced at a rate of 1.16 m per hour to over 890 m long. The average temperature was 101 degrees Celsius with a maximum of 264 for L5 and an average of 121 degrees Celsius with a maximum of 293 for L6. A new lobate flow emerged just to the N of L6; measurements on 2 June indicated that the temperature of the flow was similar to that of L6. Data indicated that the lava dome in Nicanor Crater did not get larger. The average sulfur dioxide emission rate was 706 (� 216) tons/day, reaching a high value of 1,101 on 27 May. The number and intensity of thermal anomalies increased, and were notable on 20, 23, 25, 28, and 30 May, likely due to the active lava flows. The Alert Level remained at Yellow, the second lowest level on a four-color scale. ONEMI stated that Alert Level Yellow (the middle level on a three-color scale) remained in place for the communities of Pinto and Coihueco, noting that the public should stay at least 2 km away from the crater.

Source: Servicio Nacional de Geolog�a y Miner�a (SERNAGEOMIN)

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