Geologic map of Lassen Volcanic National Park and vicinity, California

Clynne, Michael A.; Muffler, L. J. Patrick

doi:10.3133/sim2899

Cited by 43 publications

(120 citation statements)

References 24 publications

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“…Regional volcanoes have a wide range of forms (i.e., small cinder cones, shield volcanoes), and the result of regional volcanism is the construction of a large plateau of overlapping mafic volcanoes (Clynne and Muffler, 2010). Larger volcanic centers, including the LVC, have consisted of basaltic-andesite to andesite composite cones and silicic domes and flows.…”

Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

“…Most of these lakes exist in coniferous forests and mountainous topography at elevations between about 1,768 m and about 2,500 m falling into either the alpine zone (at or above the tree line) or sub-alpine zone (below the tree line). Lake formation is post-glacial, with some lakes being directly formed from glacial advance (i.e., Lake Helen, a cirque lake), some lakes existing in topographic lows within the volcanogenic and glacially-altered landscape (i.e, Widow Lake), and some lakes being formed as a direct result of volcanic activity (i.e., Butte Lake, Manzanita Lake) (Clynne and Muffler, 2010). Many of these lakes are situated in wilderness areas and can only be accessed on foot via trails.…”

Section: Lassen Volcanic National Park Lakesmentioning

confidence: 99%

“…On the northeastern flank of Lassen Peak is a 3-mi 2 area called the Devastated Area. Disturbance to this area was caused by pyroclastic flows and two lahars generated (Clynne and others, 2008;Clynne and Muffler, 2010). Manzanita Lake was dammed in 1913, which artificially raised the lake level by about 2 ft (Clynne and others, 2012).…”

Section: Hwy Mile 187mentioning

confidence: 99%

“…The Lassen Volcanic Center consists of widely distributed vents and domes extending over an approximate 20 km north-south by an approximate 25 km east-west area, and encompasses Lassen Peak (Clynne and others, 2012). Volcanic centers are defined as the foci of long-lived (> 1 Ma), voluminous (few hundred cubic kilometers) volcanism (Clynne and Muffler, 2010). The Lassen Volcanic Center (about 825,000 years in age) is superimposed upon a background of regional scale basaltic-andesitic volcanism, and is the youngest of approximately five long-lived volcanic centers younger than about 3 Ma (Clynne, 1993).…”

Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

“…Larger volcanic centers, including the LVC, have consisted of basaltic-andesite to andesite composite cones and silicic domes and flows. The evolution of the LVC is comprised of three stages of volcanism: (1) the Rockland caldera complex (825,000-610,000 years ago, a dacite domefield, (2) Brokeoff Volcano (590,000-385,000 years ago), an andesitic composite cone; and (3) the Lassen dome field, including Lassen Peak (300,000 years ago to present (Clynne, 1993;Clynne and Muffler, 2010). Some LVC eruptions, such as the emplacement of Chaos Crags, the eruption of the Cinder Cone, and the 1914-1917 eruptions of Lassen Peak have occurred in the last approximately 1,000 years.…”

Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

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Sixth International Limnogeology Congress: field trip guidebook, Reno, Nevada, June 15-19, 2015

2015

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Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

Section: Lassen Volcanic National Park Lakesmentioning

confidence: 99%

Section: Hwy Mile 187mentioning

confidence: 99%

Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

Section: Geology Of the Lassen Volcanic Centermentioning

confidence: 99%

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Sixth International Limnogeology Congress: field trip guidebook, Reno, Nevada, June 15-19, 2015

2015

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Segmentation of plate coupling, fate of subduction fluids, and modes of arc magmatism in Cascadia, inferred from magnetotelluric resistivity

Wannamaker

Evans

Bedrosian

et al. 2014

Geochem Geophys Geosyst

102

106

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Five magnetotelluric (MT) profiles have been acquired across the Cascadia subduction system and transformed using 2-D and 3-D nonlinear inversion to yield electrical resistivity cross sections to depths of 200 km. Distinct changes in plate coupling, subduction fluid evolution, and modes of arc magmatism along the length of Cascadia are clearly expressed in the resistivity structure. Relatively high resistivities under the coasts of northern and southern Cascadia correlate with elevated degrees of inferred plate locking, and suggest fluid-and sediment-deficient conditions. In contrast, the north-central Oregon coastal structure is quite conductive from the plate interface to shallow depths offshore, correlating with poor plate locking and the possible presence of subducted sediments. Low-resistivity fluidized zones develop at slab depths of 35-40 km starting 100 km west of the arc on all profiles, and are interpreted to represent prograde metamorphic fluid release from the subducting slab. The fluids rise to forearc Moho levels, and sometimes shallower, as the arc is approached. The zones begin close to clusters of low-frequency earthquakes, suggesting fluid controls on the transition to steady sliding. Under the northern and southern Cascadia arc segments, low upper mantle resistivities are consistent with flux melting above the slab plus possible deep convective backarc upwelling toward the arc. In central Cascadia, extensional deformation is interpreted to segregate upper mantle melts leading to underplating and low resistivities at Moho to lower crustal levels below the arc and nearby backarc. The low-to high-temperature mantle wedge transition lies slightly trenchward of the arc.

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Hydrothermal response to a volcano‐tectonic earthquake swarm, Lassen, California

Ingebritsen

Shelly

Hsieh

et al. 2015

Geophysical Research Letters

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The increasing capability of seismic, geodetic, and hydrothermal observation networks allows recognition of volcanic unrest that could previously have gone undetected, creating an imperative to diagnose and interpret unrest episodes. A November 2014 earthquake swarm near Lassen Volcanic National Park, California, which included the largest earthquake in the area in more than 60 years, was accompanied by a rarely observed outburst of hydrothermal fluids. Although the earthquake swarm likely reflects upward migration of endogenous H2O‐CO2 fluids in the source region, there is no evidence that such fluids emerged at the surface. Instead, shaking from the modest sized (moment magnitude 3.85) but proximal earthquake caused near‐vent permeability increases that triggered increased outflow of hydrothermal fluids already present and equilibrated in a local hydrothermal aquifer. Long‐term, multiparametric monitoring at Lassen and other well‐instrumented volcanoes enhances interpretation of unrest and can provide a basis for detailed physical modeling.

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Geologic map of Lassen Volcanic National Park and vicinity, California

Cited by 43 publications

References 24 publications

Sixth International Limnogeology Congress: field trip guidebook, Reno, Nevada, June 15-19, 2015

Sixth International Limnogeology Congress: field trip guidebook, Reno, Nevada, June 15-19, 2015

Segmentation of plate coupling, fate of subduction fluids, and modes of arc magmatism in Cascadia, inferred from magnetotelluric resistivity

Hydrothermal response to a volcano‐tectonic earthquake swarm, Lassen, California

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