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Terminal Geyser
Terminal Geyser
Terminal Geyser is accessed by Warner Valley Trailhead in the southeast corner of the park and is a round trip of 5.8 miles. A popular geothermal feature, although named Terminal Geyser, it is actually formed by a cold stream flowing over a steam vent.
Cinder Cone
Cinder Cone
One of the two volcanoes of Lassen Volcanic National Park is the Cinder Cone, which erupted 350 years ago. The eruption left behind tons of mafic ash in the crater and surrounding areas leaving dune-like features in the landscape. There are 5 lava flows from the eruption made of andesite rock that make a field of lava rock.
Lassen Peak
Lassen Peak
Lassen Peak is the southernmost active volcano in the Cascade Range featured in the park. It erupted on May 22, 1915, raining ash as far as 200 miles. It is the largest of more than 30 volcanic domes in Lassen National Park.
Devils kitchen
Devils kitchen
Devil’s Kitchen is a hydrothermal feature caused by the magma below the earth's surface. It can be dangerous for hikers that stray off the path. A key feature in the Devil's Kitchen is the hydrothermally altered rocks which look like a backdrop of a movie.
Boiling Springs Lake
Boiling Springs Lake
Hydrothermal features are common at Lassen Volcanic National Park. Boiling Springs Lake is the second-largest hydrothermal landform of its kind. It is a lake that is 60m wide and 15 meters deep. There are beautiful hikes that go around the scenic view of the lake.
Bumpass Hell Basin
Bumpass Hell Basin
Bumpass Hell Basin is the largest hydrothermal area in the park. The 16-acre basin holds a variety of hydrothermal features including hot springs, fumaroles, and boiling mud pots. Viewed from an 8,200-8,400 ft. elevation, it is a result of fissures that tapped the volcanic heat creating the variety of the basin.
Maps:
Vocabulary:
Geothermal: Produced by the internal heat of the earth.
Steam Vent: A small opening that allows gases to leave or enter a system, sometimes accompanied by a whistling noise.
Mafic: Relating to or denoting dark-colored minerals.
Hydrothermal: Involving heated water in the earth's crust.
Hot Spring: A spring of heated water, often due to subterranean volcanic activity.
Fumaroles: An opening in or near a volcano through which gases emerge.
Boiling Mud Pots: A natural hot spring filled with bubbling mud.
Fissures: Long narrow cracks in the earth.
The dune features of the park have unique coloration from ash deposits from the volcanic activity.
Trails cut through tons of the unique geothermal and hydrothermal features.
A cross-section of the Cinder Cone Volcano shows its vents and the shape of its crater.
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