Most Recent Weekly Report: 10 February-16 February 2021
Satellite data showed discolored water around and to the SW of Kavachi on 25 January. Discolored water was not obviously visible in 20 January images; weather clouds prevented views of the area in images through 14 February.
Most Recent Bulletin Report: June 2021 (BGVN 46:06)
Discolored water plumes observed in satellite imagery during October 2020-April 2021
Kavachi is an active submarine volcano in the SW Pacific, located in the Solomon Islands south of Gatokae and Vangunu islands. Volcanism has been characterized by phreatomagmatic explosions that ejected steam, ash, and incandescent bombs. The previous report described discolored plumes extending from a single point during early September 2020 (BGVN 45:10); similar activity was recorded for this reporting period covering October 2020 through April 2021 using satellite data.
Activity at Kavachi is most frequently observed through Sentinel-2 satellite imagery and has recently been characterized by discolored submarine plumes. On 2 October 2020 a slight yellow-green discoloration in the water was observed extending NE from a specific point (figure 23). Similar faint discolored plumes were intermittently recorded on 27 October, 1 November 2020, and 25 January 2021, which each extended NE, SW, and SW, respectively, from a point source above the summit where previous activity has occurred. Intermittent discolored plumes were also visible during March 2021 (figure 24). The plume discoloration on 1 March extended S from the origin point. On 11 March, the discoloration remained near the origin point. A narrow plume extended several kilometers W on 26 March, followed by a short plume seen towards the NW on 31 March. The only plume seen in April was a broad diffuse area of discoloration extending S on the 10th (figure 24). No discoloration near the volcano was observed in May.
Information Contacts: Sentinel Hub Playground (URL: https://www.sentinel-hub.com/explore/sentinel-playground).