Years ago, I was standing on a steep trail somewhere near where this photo was taken, craning my neck upwards to try to figure out why the tree next to me was shaking so. It dawned on me, belatedly, that the culprit was not a large bird, but rather an earthquake. A lot of the loose gravelly sedimentary and volcanic deposits like that can be seen on the riverbank in this photo slid downward into the river canyon. Somewhat scary, but, of course, not as serious as events the caldera that is Yellowstone might be capable of producing someday.
Years ago, I was standing on a steep trail somewhere near where this photo was taken, craning my neck upwards to try to figure out why the tree next to me was shaking so. It dawned on me, belatedly, that the culprit was not a large bird, but rather an earthquake. A lot of the loose gravelly sedimentary and volcanic deposits like that can be seen on the riverbank in this photo slid downward into the river canyon. Somewhat scary, but, of course, not as serious as events the caldera that is Yellowstone might be capable of producing someday.