A’a Lava (2-3m thick) at the Gerlingadalur Volcano by Dr. Holly Spice. Hidden Iceland (6). Posted on March 29, 2021March 29, 2021 VOLCANIC ERUPTION IN ICELAND 1440 × 1234 A’a Lava (2-3m thick) at the Gerlingadalur Volcano by Dr. Holly Spice. Hidden Iceland (6). A’a Lava (2-3m thick) at the Gerlingadalur Volcano by Dr. Holly Spice. Hidden Iceland (6).