Without a functioning wastewater system, the area would be unsuitable for visitor use and the existing facilities would need to be closed. To address these and other issues, the environmental assessment considers two alternatives. Alternative 1 analyzes a no action alternative continuing the existing management of the Drakesbad leachfield. Alternative 2, proposes to construct a new wastewater disposal field in order to treat the wastewater generated at the Drakesbad facilities.
Because public participation is very important to the success of the project, the National Park Service NPS encourages your input and comment during the public review period. Comments will be accepted through May 30, The NPS prefers comments to be submitted in writing on the same site. Box , Mineral, California Commentators should be aware that their entire comment — including personal identifying information — may be made publicly available at any time.
While commentators can ask that their personal identifying information be withheld from public review, the National Park Service cannot guarantee that this will be possible. You must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Join the adventure. Rheologic properties and kinematics of emplacement of the Chaos Jumbles rockfall avalanche, Lassen Volcanic National Park.
Res , Green J, Short N M, New York: Springer-Verlag, p. Late Cenozoic volcanism, subduction, and extension in the Lassen region of California, southern Cascade Range. Heiken G, Plinian-type eruptions in the Medicine Lake Highland, California, and the nature of the underlying magma. Hildreth W E, Quaternary magmatism in the Cascades--geologic perpectives. Time-variation of hydrothermal discharge at selected sites in the western United States: implications for monitoring. Age of Lassen Peak, California, and implications for the ages of late Pleistocene glaciations in the southern Cascade Range.
Geol Soc Amer Bull , Williams H, Univ Calif Pub Geol Sci , Wood C A, Kienle J eds , Volcanoes of North America.
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Cambridge, England: Cambridge Univ Press, p. Poland, M. Bawden, M. Lisowski, and D. Dzurisin, Eos Trans. AGU, 85 47 , Fall Meet. The maps shown below have been scanned from the GVP map archives and include the volcano on this page.
Clicking on the small images will load the full dpi map. Very small-scale maps such as world maps are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.
Lassen Volcanic National Park
Catalog number links will open a window with more information. Lassen Volcanic Center. Seismic events in the Lassen area that were apparently triggered by the M 7. Squares mark seismic stations. Courtesy of S. Information is preliminary and subject to change. References The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.
Co;2 Williams H, Eruptive History There is data available for 7 Holocene eruptive periods. Unknown Confirmed 3 Dendrochronology Cinder Cone [ ? Deformation History There is data available for 1 deformation periods. Expand each entry for additional details.
Full References: Poland, M. Photo Gallery The blocky surface of Chaos Jumbles in the foreground was produced by collapse of a portion of the Chaos Crags lava dome complex in the background about CE. The cold rock avalanche traveled 5 km from its source, and may have occurred in the absence of any eruptive activity. Three successive lobes of the avalanche cover an area of 8 sq km. Photo by Lee Siebert, Smithsonian Institution. The tree stump and strip of red bark fragments in the foreground are the remnants of one of the many trees blown down radially away from the volcano by a pyroclastic surge on May 22, , during the paroxysmal phase of the eruption of Lassen Peak.
The Devastated Area in the background remained sparsely vegetated for many decades following the eruption. The trunks of the large ponderosa pine tree at the left and the smaller birch to the right in the Lost Creek valley NE of Lassen Peak were bent over by a mudflow from an eruption in May After the eruption vertical growth of the trees resumed.
The mudflows traveled 50 km from the volcano, destroying bridges, farmlands, and farm buildings. Chaos Jumbles, a debris avalanche-deposit formed by collapse of Chaos Crags about CE, is seen from the top of the avalanche scarp. The avalanche traveled up to 5 km in three lobes now covered with varying degrees of vegetation. The avalanche was emplaced as a cold rockfall avalanche; there is no direct evidence for an associated explosive eruption.
The massive dacitic lava dome of Lassen Peak rises above Lake Helen on the south side of the volcano. Plugs of dark dacitic lava exposed near the summit are surrounded by vast aprons of lighter-colored talus associated with growth of the lava dome.
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Hikers perch on a small pinnacle of dacitic lava that forms the high point of Lassen Peak, the southernmost major volcano in the Cascade Range that stretches from southern British Columbia to northern California. Lassen Peak is a large dacitic lava dome that last erupted from to An aerial view of cloud-capped Lassen Peak from the NW shows the Chaos Crags lava dome complex on its left, the source of rockfall avalanche in CE, and the older Brokeoff stratovolcano and post-caldera lava domes on the right. Lassen Peak was the source of California's latest eruption, that lasted from to Photo by Lyn Topinka, U.
Geological Survey. The sparsely vegetated Devastated Zone on the NE flank of Lassen Peak was swept by a pyroclastic surge on May 22, , during the paroxysmal phase of the eruption. The pyroclastic surge destroyed forests, and was accompanied by mudflows that traveled down Lost Creek and Hat Creek valleys. Chaos Crags lava dome rises in the background. TripAdvisor has been notified. This property is closed Report incorrect address Suggest edits.
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