What type of volcano is Clear Lake?

The Clear Lake Volcanic Field is a volcanic field beside Clear Lake in California’s northern Coast Ranges.
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Is Clear Lake in California a volcano?

Geological Summary

The westernmost site of Quaternary volcanism in California, this volcanic field is far west of the Cascade Range in a complex geologic setting within the San Andreas transform fault system. Mount Konocti, a composite dacitic lava dome on the south shore of Clear Lake, is the largest volcanic feature.

Is Clear Lake Volcanic Field active?

The Clear Lake volcanic field has been active for the last 2 million years. It covers an area of about 400 km2 in Lake County and has been intensively studied since the early 1970’s.

How was Clear Lake formed?

Clear Lake was born when a huge landslide dammed the headwaters of Cold Creek, blocking westward water flow into the Russian River. Water filled the level valley. The rising waters eventually found an outlet in Cache Creek, which drained eastward into the Sacramento River.

What would happen if Clear Lake volcano erupted?

These eruptions would be phreatomagmatic and would pose ash-fall and wave hazards to the lakeshore and ash-fall hazards to areas within a few kilometers of the vent. Eruptions away from the lake would produce silicic domes, cinder cones and flows and would be hazardous within a few kilometers of the vents.

When did Clear Lake volcano erupt?

The Clear Lake Volcanics erupted during four periods of time beginning at about 2 Ma. There is a general decrease in age northward from 2 Ma in the south to about 10,000 years in the north.

Will the Clear Lake volcano erupt?

Eruptions are likely to be located close to, beneath, or northeast of Clear Lake, especially around the east arm of the lake. Phreatomagmatic eruptions would occur near the lake and would pose ash-fall and wave hazards to the lakeshore and ash-fall hazards to areas within a few kilometers of the vent.

Where is Clear Lake volcano?

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.

Is Long Valley caldera active?

Long Valley Caldera and the Mono-Inyo Craters chain form a large volcanic complex in eastern California that has had persistent earthquake activity and ground uplift in recent decades. Volcanoes have been active in the area for millions of years, and future eruptions are certain to occur.

Is Mount Konocti active?

At 4,305 feet (1,312 m), it is the second highest peak in the Clear Lake Volcanic Field, which consists of numerous volcanic domes and cones ranging from 10,000 to 2.1 million years old. Although it is often described as extinct, it is actually classified as High Threat Potential.

What kind of volcano is Konocti?

dacitic composite cone

Mount Konocti, a mostly dacitic composite cone, on the western shore of Clear Lake, California. The round flat-topped hill in the foreground with a small right peak is a maar volcano.

Is Cobb mountain a volcano?

Volcanic rocks in the Geysers – Cobb Mountain area are part of the late-Pliocene-Holocene Clear Lake volcanic field that occurs within the eastern Coast Range of northern California, east of the San Andreas fault and southwest of the active Cascade magmatic arc (Fig. 1; Hearn et al., 1981, 1995).