Since NASA Earth Observatory started publishing images in 1999, the archive has grown to contain more than 17,000 stories. This week, Image of the Day stories highlight this robust archive with a look back at images acquired “on this day.” Our brief retrospective illustrates that Earth observations are more than just snapshots in time; together they allow us to better understand—and marvel at—our diverse, changing planet. These images, acquired on July 4 and July 6, 2020, were originally published with the text below on July 7, 2020.
A young volcanic island has been growing in the western Pacific Ocean since 2013. Since mid-June 2020, it has been going through a vigorous growth spurt.
The images on this page show some of the latest eruptive activity at Nishinoshima, a volcanic island about 1,000 kilometers (600 miles) south of Tokyo, Japan. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite acquired the natural-color image [below] on July 6, 2020, when the volcanic plume stretched hundreds of kilometers to the north and rose several thousand meters into the sky.
The false-color image [above], acquired by Landsat 8 on July 4, 2020, combines shortwave infrared and visible wavelengths (bands 7-6-4). It reveals the heat signature of erupting lava and the relative coolness of the dark ash plume (blowing north). The bright purple clouds close to the island could be steam from the volcano or from lava vaporizing seawater.
According to reports and aerial photographs from the Japan Coast Guard, activity at the volcano appeared to pick up in late May, spewing ash and lava with more vigor than in previous months. On July 3, the volcanic plume rose as high as 4700 meters (15,400 feet) above sea level; the next day, ash was detected as high as 8300 meters (27,200 feet), the highest altitude a plume has risen since the volcano poked above the water line in 2013. Volcanic bombs were ejected as far as 2.5 kilometers (1.6 miles) from Nishinoshima that day.
According to news reports citing the Geospatial Information Authority of Japan, the southern shore of the island grew by at least 150 meters between June 19 and July 3. The European Space Agency’s TROPOMI satellite also observed a sizable plume of sulfur dioxide from the eruption.
Nishinoshima is part of the Ogasawara Islands, in the Volcano Islands arc. It is located at 27° 14’ North latitude and 140° 52’ East longitude, about 130 kilometers (80 miles) from the nearest inhabited island. You can see the evolution of the island eruption by visiting our Nishinoshima event page.
NASA Earth Observatory image by Lauren Dauphin, using Landsat data from the U.S. Geological Survey and MODIS data from NASA EOSDIS/LANCE and GIBS/Worldview. Story by Michael Carlowicz.