Volcanos

Roundup of Global Volcanic Activity – New Activity for the Week 17 June 2020 – 23 June 2020

Erta Ale | Ethiopia : Satellite data showed a minor thermal anomaly in Erta Ale’s S pit crater on 12 June and a larger anomaly on 17 June at the site of the previous lava lake.

Karymsky | Eastern Kamchatka (Russia) : KVERT reported that a thermal anomaly over Karymsky was identified in satellite images during 11-19 June, possibly due to ongoing Strombolian activity. The Aviation colour Code remained at Orange (the second highest level on a four-colour scale).

Laguna del Maule | Central Chile-Argentina border : SERNAGEOMIN’s Volcanological Observatory of the Southern Andes (OVDAS) of Chile and SEGEMAR’s Argentine Observatory of Volcanic Surveillance (OAVV) reported anomalous activity at Laguna del Maule Volcanic Complex. Elevated levels of carbon dioxide were detected in an area SW of the caldera lake, along the lower part of the Cabecera de Troncoso River, about 5 km from the lake’s shore. Carbon dioxide emissions were measured in February 2020 and notably elevated relative to March 2019 measurements. An impacted area possibly stretched as far as 500 m from the point representing the highest carbon dioxide emission rate; observers noted areas of discoloured brown and orange soil aonlg with dead or emaciated animals. Three swarms of volcano-tectonic (VT) earthquakes recorded in mid-June were mainly located in the Las Nieblas area, SW of the lake, at depths of 2-8 km. The first began at 0340 on 11 June and totaled at least 400 events. The second swarm began at 2338 on 12 June was characterized by 121 events, located 8.8 km W of the crater. The third swarm began at 2334 on 15 June and was characterized by 190 events located 10.4 km SW of the crater. All of the earthquakes were small magnitudes; the largest event was a local M 2.5. On 18 June the Alert Level was raised to Yellow, the second lowest colour on a four-colour scale; ONEMI recommended restricting access within a radius of 2 km from the emission center. Seismic activity continued to be recorded, though at lesser magnitudes.

Makushin | Fox Islands (USA) : AVO reported that numerous smaller earthquakes in an area about 12 km SE of Makushin’s summit were recorded after two events greater than M 4 occurred on 15 June. The earthquake activity continued during 16-23 June, though at a declining rate and magnitudes. No surficial activity was visible in satellite or webcam images; only typical minor steaming from summit fumaroles was visible. The Aviation colour Code and Volcano Alert Level remained at Yellow and Advisory, respectively.

Turrialba | Costa Rica : OVSICORI-UNA reported that ash emissions at Turrialba rose no higher than100 m above the crater rim from events recorded at 1714, 1723, and 1818 on 18 June and at 1023 and 1039 on 19 June. A small ash emission was visible at 1715 on 22 June.

Veniaminof | United States : On 18 June AVO stated that periods of seismic tremor and occasional earthquakes had been recorded at Veniaminof over the past few days. The increase above background levels prompted AVO to raise the Volcano Alert Level to Advisory and the Aviation colour Code to Yellow. Periods of low-amplitude seismic tremor decreased in frequency during 19-20 June, and were not detected at all by 21 June.

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