Lassen Peak and Mount St Helens Comparison

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National Park Service U.S. Department of the Interior Lassen Volcanic National Park Lassen Peak and Mount St. Helens Comparison Similarities Differences Both volcanoes: • Mount St. Helens did not have extruded lava • Involve a series of explosions, which took place over a • Lassen produced three craters, Mount St. Helens produced few months time. two. • Sent at least one major eruption of gas and ash to • Lassen has a main lava and mudflow on May 19 prior to the great heights. great explosive eruption on May 22. • Produced an acidic dacite ash. • Lassen’s explosive action was not as wide as the mudflow. • Produced steam deposits of ash, which trailed out • The width of blow down on Lassen was only 1 ½ mile wide. about 30 miles. • Timber destroyed by flow of explosive blast at Mount St. • Resulted in a display of countless logs, which lay in Helens was 1 billion board feet verses 4.5 million board feet rows pointing away from the explosive hot blast. at Lassen. • Were snow-covered and mudflows were fed by the • Melted snow is considered a major source of mudlflow in snowmelt. Lassen’s eruption. • Released ash into the air where it traveled in • A cloud rose 5 miles high from Lassen, and 12 miles high quantities for at least 100 miles. above Mount St. Helens. • Caused reduced visibility for many days. • Eruptions lasted four years at Lassen, eruptions began in • Produced small craters scattered over the area due to March 1980 at Mount St. Helens and are continuing. stream, ash, or lave chunks. Lassen was the only one • Mud marks on trees reached 6 ½ feet high at Lassen. with lave chunks, also known as hot rocks. • Had domes form in one or more vents. Mount St. Helens is still temporary as far as a prevention of further eruption is concerned. .

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Area Adventure Hat Creek Ranger District Lassen National Forest
Area Adventure Hat Creek Ranger District Lassen National Forest Welcome The following list of recreation activities are avail- able in the Hat Creek Recreation Area. For more detailed information please stop by the Old Station Visitor Information Center, open April - December, or our District Office located in Fall River Mills. Give Hat Creek Rim Overlook - Nearly 1 million years us a call year-around Mon.- Fri. at (530) 336-5521. ago, active faulting gradually dropped a block of Enjoy your visit to this very interesting country. the Earth’s crust (now Hat Creek Valley) 1,000 feet below the top of the Hat Creek Rim, leaving behind Subway Cave - See an underground cave formed this large fault scarp. This fault system is still “alive by flowing lava. Located just off Highway 89, 1/4 and cracking”. mile north of Old Station junction with Highway 44. The lava tube tour is self guided and the walk is A heritage of the Hat Creek area’s past, it offers mag- 1/3 mile long. Bring a lantern or strong flashlight nificent views of Hat Creek Valley, Lassen Peak, as the cave is not lighted. Sturdy Shoes and a light Burney Mountain, and, further away, Mt. Shasta. jacket are advisable. Subway Cave is closed during the winter months. Fault Hat Creek Rim Fault Scarp Vertical movement Hat Creek V Cross Section of a Lava Tube along this fault system alley dropped this block of earth into its present position Spattercone Trail - Walk a nature trail where volca- nic spattercones and other interesting geologic fea- tures may be seen.
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Time-Scale and Mechanism of Subsidence at Lassen Volcanic Center, CA, from Insar
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Lassen National Forest Backcountry Discovery Trail! Know Before You Go
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Eruptions of Lassen Peak, California, 1914 to 1917
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