NOAA GOES-3 Visible (0.65 µm) images at 1545 and 1615 UTC (above) showed the volcanic cloud shortly after the explosive eruption of Mount St. Helens on 18 May 1980. GOES-3 was decommissioned in 2016.The corresponding GOES-3 Infrared (11.5 µm) image at 1545 UTC (below) appeared to display a small “enhanced-V” or cold/warm (-65ºC/-47ºC)... Read More
Nishinoshima is a small volcanic island (at 27.2471° N, 140.8779° E) about 150 km west of Chichijima.) Nishinoshima has grown in size over the past decades because of volcanic activity, including activity (apparently accompanied by occasional earthquakes) that started in March 2020. Day Night Band imagery from NOAA-20, above, (toggled with an annotated image) shows the light from... Read More
Even though the South Sandwich Islands are near the limb of the GOES-16 (GOES-East) view, Near-Infrared “Cloud Particle Size” (2.24 µm) images (above) were able to display a long volcanic plume (brighter shades of white) originating from Mount Michael on Saunders Island during the daylight hours on 12 March 2020. In addition, smaller/shorter volcanic... Read More
Following two days of increasing seismicity, Mount Shishaldin began a period of more intense eruptive activity around 0930 UTC on 19 January 2020 — a comparison of topography along with Suomi NPP VIIRS Shortwave Infrared (3.74 µm) and Infrared Window (11.45 µm) images at 1323 UTC (above) displayed a distinct thermal... Read More
