Qualla: Lassen Peak

Lassen Peak: Introduction

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Kai Schreiber from Jersey City, USA, CC BY-SA 2.0. On May 22, 1915, Lassen Peak in northeastern California produced a massive eruption that sent a column of ash and rock 30,000 feet into the atmosphere. A pyroclastic flow raced down the mountain's northeast slope at 100 miles per hour, devastating everything in its path. Mudflows extended 18 miles down Hat Creek Valley. The eruption made Lassen Peak the most recently active volcano in the Cascade Range until Mount St. Helens exploded in 1980. The mountain had been rumbling since May 1914, when steam began venting from a new crater near the summit. Over 300 explosions occurred during the following year. The 1915 climax confirmed that the Cascades remained volcanically active, that the same forces that built Mount Shasta and Mount Hood still simmered beneath northern California. Today, Lassen Volcanic National Park preserves not only the scarred peak but also boiling mudpots, fumaroles, and hot springs that remind visitors the volcano is only sleeping.

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Image: Kai Schreiber from Jersey City, USA | CC BY-SA 2.0

Lassen Peak: The Awakening

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit LassenNPS, Public domain. Lassen Peak had been quiet for 27,000 years when, on May 30, 1914, a small explosion opened a vent near the summit. Over the following months, the crater grew as more explosions followed - 180 by the end of 1914. Lava began to appear in the crater, and by May 1915, a growing lava...

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Image: LassenNPS | Public domain

Lassen Peak: The Eruption

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Frank Schulenburg, CC BY-SA 4.0. The May 22, 1915, eruption began in the evening. A new, larger outpouring of lava triggered explosions and pyroclastic flows - superheated currents of gas and volcanic debris. The pyroclastic flow raced down the northeast slope, leveling trees for three miles and leaving a zone o...

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Image: Frank Schulenburg | CC BY-SA 4.0

Lassen Peak: The Science

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit DimiTalen, CC BY-SA 3.0. Lassen Peak is the southernmost volcano in the Cascade Range, a chain of volcanoes stretching from Lassen to Mount Garibaldi in British Columbia. The Cascades are fed by the Cascadia Subduction Zone, where the Juan de Fuca Plate dives beneath North America - the same process that...

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Image: DimiTalen | CC BY-SA 3.0

Lassen Peak: The Park

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit en:User:Mav, CC BY-SA 3.0. Lassen Volcanic National Park was established in 1916, created in part by the dramatic publicity the eruption generated. The park protects 106,372 acres of volcanic landscape, including Lassen Peak, the Devastated Area, and extensive hydrothermal features. Bumpass Hell, the large...

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Image: en:User:Mav | CC BY-SA 3.0

Lassen Peak: Visiting Lassen

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit E mln e, CC BY 4.0. Lassen Volcanic National Park is located in northeastern California, about 50 miles east of Redding. The main park road crosses from the southwest to the northeast entrance, climbing to 8,512 feet at Lake Helen. Key attractions include Bumpass Hell (a 3-mile round-trip hike to th...

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Image: E mln e | CC BY 4.0