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On May 22, 1915, a powerful explosive eruption at Lassen Peak devastated nearby areas, and spread volcanic ash as far as 280 mi (450 km) to the east. This explosion was the most powerful in a series of eruptions from 1914 through 1917.
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Loomis was a local homesteader and photographer who documented the 1915 eruptions of Lassen Peak, and was instrumental in the 1916 establishment of the national park. In 1929 Loomis donated the museum and 40 acres (16 ha) of surrounding lands to the National Park Service , which since then has used the structure as an interpretational facility.
Lassen Peak eruption from Reflection Lake, 1915. Pyroclastic eruptions then started to pile tephra into cones in the northern area of the park. Mount Tehama (also known as Brokeoff Volcano) rose as a stratovolcano in the southwestern corner of the park during the Pleistocene.
Pumice ejected during the 1915 eruption of Lassen Peak is conspicuously banded with light streaks of dacite and dark andesite, which appears to represent two distinct magmas imperfectly mixed during the eruption. The 1915 eruption of Lassen Peak was the second most recent volcanic outburst in the contiguous 48 U.S. states (after the 1980 ...
Eruption of Lassen Peak. Lassen Peak, one of the Cascade Volcanoes in California, erupted sending an ash plume 30,000 feet in the air and devastating the nearby area with mudslides and hot gas clouds mixed with debris. It is the last volcano to erupt in the contiguous United States until the 1980 eruption of Mount St. Helens. [145]
A year before Ishi's death, Mt. Lassen exploded. Mt. Lassen is officially recognized as Lassen Peak by the United States Board on Geographic Names. Before the eruption on May 22, 1915, the smoking volcano became a tourist draw. Today, within Lassen Volcanic National Park, the area surrounding the volcano is known as the Devastated Area.
Lasting from 1125 years ago to 1060 years ago, [20] this eruptive phase resembled the Lassen Peak eruptions in May 1915, [6] though the Chaos Crag eruption had a magnitude 100 times greater, [21] with an output volume of 0.34 cubic miles (1.4 km 3). [12]