Global Volcanism Program | Image GVP-12273
The 30 x 100 km Toba caldera formed during four major eruptions, the most recent occurring 74,000 years ago when it erupted the Young Toba Tuff. Samosir Island is an area of resurgence within the caldera, formed by uplifting of the caldera floor by at least 1.1 km over thousands of years. N is at the top of this 21 June 2019 Sentinel-2 satellite image.
Satellite image courtesy of Copernicus Sentinel Data, 2019.
This image is made available under the Creative Commons BY-SA 4.0 license terms.