Global Volcanism Program | Image GVP-02583
The 300-m-wide East Maar is one of the two Ukinrek Maars, which were formed during an eruption in 1977 through glacial deposits on the Alaska Peninsula. This fresh maar, in contrast to older ones whose rims have been modified by slumping and erosion, has steep-sided walls. The explosions blasted through the pre-existing, light-colored glacial till forming the bottom half of the distant crater wall and then deposited the dark, bedded layers in the upper half of the crater wall as well as the dark blanket of blocks and ash surrounding the maar.
Copyrighted photo by Katia and Maurice Krafft, 1978.
Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.