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Location of recent earthquakes near Mammoth Mountain (CA)
Tuesday, Feb 11, 2014
An small earthquake swarm at shallow depths (around 5 km) occurred east of Mammoth Mountain during the past week. The largest quake was a magnitude 3.0 event on 5 Feb. ... [more]
Map of recent quakes at the Long Valley caldera (California)
Friday, Jul 19, 2013
Normal seismic activity with numerous tiny earthquakes continues to occur at the southern and western parts of the caldera as well as under Mammoth mountain. There are no signs of a possible eruption in a near future. [more]

Volcanoes of California (20 volcanoes)

Medicine Lake | Mount Shasta | Brushy Butte | Twin Buttes | Silver Lake | Tumble Buttes | Eagle Lake | Lassen | Clear Lake | Mono Lake | Mono Craters | Long Valley | Inyo Craters | Mammoth Mountain | Ubehebe Craters | Golden Trout Creek | Coso | Lavic Lake | Amboy | Salton Buttes
Medicine Lake
(shield volcano)
Medicine Lake is a large shield volcano in northeastern California about 50 km (30 mi) northeast of Mount Shasta, rising about 1,200 metres (3,900 ft) above the Modoc Plateau to an elevation of 2,376 metres (7,795 ft). It contains a 12 km x 7 km wide caldera.
The shield vol... [more]

Mount Shasta
(stratovolcano)
Mount Shasta volcano seen from Lassen PeakMt Shasta in Siskiyou County, northen Californian, is the second largest volcano of the Cascade Range. Mount Shasta rises majestically nearly 10,000 ft (3000 m) above the surrounding terrain as it is not connected to any nearby mountain. It has an estimated volume of 350 km3 whic... [more]

Brushy Butte
(shield volcano)
The broad inconspicuous volcano in the center of the photo is Brushy Butte, a small shield volcano SSE of the Medicine Lake Highlands. The Brushy Butte complex has produced a broad apron of basaltic lava flows, seen here from Timbered Crater with the Big Valley Mountain fault scarp in the background. Fresh-looking flows extend preferentially down the regional gradient to the south as far as the Falls River valley, but the age of Brushy Butte is not well known. The volcano may be of late-Pleistocene or early Holocene age. (Photo: Lee Siebert, Smithsonian Institution)Brushy Butte is a small, poorly studied shield volcano immediately east of Timbered Crater maar, and south-southeast of the Medicine Lake Highlands in northern California, USA. [more]

Twin Buttes
(cinder cones)
Twin Buttes in northern California is a volcanic field of cinder cones, lava flows and domes. [more]

Silver Lake
(cinder cones)
Silver Lake is one of many volcanic fields northern California. It consists of 3 small explosion craters The volcano consists of 3 small cinder cones and lava lakes. The craters contain lakes: Silver Lake, Author Lake, and Buckhorn Lake. [more]

Tumble Buttes
(cinder cones)
Tumble Buttes is a volcanic field in northern California, consisting of several cinder cones that had been last active about 15,000 years ago. A well-known feature is Devils Rock Garden, a blocky lava flow which extends south of the volcano. [more]

Eagle Lake
(fissure vents)
Eagle Lake and some of the cinder cones of the volcanic field (photo: WikiCommons, public domain)Eagle lake is a volcanic field at the junction of the Sierra Nevada, Cascades, and Basin Range in California, USA. It contains 15 small cinder cones, fissures and lava flows. [more]

Lassen
(stratovolcano)
Kings Creek with Lassen Peak on the horizonLassen (or Lassen Peak) volcano in northern California is located at the southern end of the Cascade Range. Besides Mt St. Helens, it is the only volcano in the contiguous US that erupted in the 20th century.
Lassen's summit complex is a lava dome that rises 2,000 feet (610... [more]

Clear Lake
(volcanic field)
Clear Lake volcanic field lies in the northern Coast Ranges, California, ca. 135 km north of San Francisco. The volcanic field consists of lava dome complexes, cinder cones, and maars of basaltic-to-rhyolitic composition. Mount Konocti, a dacitic lava dome on the south shore of C... [more]

Mono Lake
(cinder cones)
The Mono Lake volcanic field east of Yosemite National Park and north of the Mono Craters in central eastern California is a series of cinder cones in Mono Lake and on its shore. It is one of the most recently active volcanoes in California, the last eruptions having occurred at ... [more]

Mono Craters
(lava domes)
The Mono Craters are an elongated, 17 km long group of lava domes, cinder cones and maars on the eastern side of the Sierra Nevada between Mono Lake and Long Valley caldera, California. The last eruption at the Mono Craters took place about 600 years ago, nearly contemporaneously... [more]

Long Valley
(caldera)
The large 17 x 32 km Long Valley caldera east of the central Sierra Nevada Range, California, is the result of a giant explosive eruption that happened about 760,000 years ago and formed the widespread and voluminous Bishop Tuff.
The caldera has been showing unrest in recen... [more]

Inyo Craters
(lava domes)
Inyo Craters are a 12-km long field of lava domes at the eastern margin of the Sierra Nevada, California, near the town of Mammoth and south of the similar Mono Craters field. The field contains silicic 6 lava domes, lava flows, and 15 explosion craters (maars) that last erupted ... [more]

Mammoth Mountain
(lava domes)
Mammoth Mountain is a lava-dome complex on the SW rim of Long Valley caldera, California. Despite its close geographic relation, it is believed that it has its own magma chamber different from the ones underlying Long Valley caldera and the Inyo craters. [more]

Ubehebe Craters
(explosion craters (maars))
Ubehebe Craters volcano is a group of maars (explosion craters) located at the western margin of Tin Mountain, California, in the northern end of Death Valley. The craters were thought to have last erupted about 6000 years ago, but a recent study suggests that some activity could... [more]

Golden Trout Creek
(volcanic field)
The Golden Trout Creek volcanic field consists of a group of cinder cones and lava flows in the Toowa Toowa valley of the Sierra Nevada, California, about 25 km south of Mount Whitney.
Toowa valley is a broad and open valley about 8600 feet high, dotted with cones rising 10... [more]

Coso
(stratovolcano)
The Coso volcanic field is located east of the Sierra Nevada Range at the western edge of the Basin and Range province, California. It consists of 38 old rhyolitic lava domes and basaltic cinder cones covering a 400 sq km area. volcano is located 200 km north of Los Angeles, Cali... [more]

Lavic Lake
(volcanic field)
Lavic Lake, a dry lakebed in the Mojave desert, California, is a volcanic field of 4 cinder cones, 3 of which are in the Lavic Lake area and a fourth in the Rodman Maountains 20 km to the west.
Pisgah crater is the main feature, a prominent 100 m high cinder cone north of L... [more]

Amboy
(volcanic field & cinder cones)
The Amboy volcanic field covers an area of 70 km2 between Bagdad Dry Lake to the west and Bristol Dry Lake to the east in the Mojave Sesert, California. It contains mainly pahoehoe lava flows. Amboy crater proper is a prominant cinder cone in the NE of the lava field. [more]

Salton Buttes
(lava domes)
The Salton Buttes volcanic field consist of 5 small rhyolitic lava domes built above sediments of the Colorado River delta within the Salton Sea geothermal field, located at the SE margin of the Salton Sea, California. [more]

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