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Medicine Lake, California simplified hazards map showing potential ...
December 31, 2017

Medicine Lake, CA simplified hazards map

Medicine Lake, California simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Tephra provides clues to eruptive history of Medicine Lake Volcano,...
September 17, 2013

Tephra provides clues to eruptive history of Medicine Lake Volcano, CA

Geologists examine tephra deposits to better understand the early eruptive behavior of the Medicine Lake Volcano, evidence of which can be found as far away as central Oregon. Widespread tephra deposits form stratigraphic markers that help decipher eruptive histories at other volcanoes in the region and are sometimes used by archeologists to help determine the age of

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Tumulus of basalt lava makes Captain Jack's stronghold.
December 31, 2012

A tumulus at Captain Jack's stronghold within Lava Beds National Mo...

A tumulus at Captain Jack's stronghold within Lava Beds National Monument .

Aerial view of lava tube across landscape
December 31, 2012

A lava tube trace (dark sinuous shape) along the ground surface.

Aerial view of a lava tube trace (dark sinuous shape) along the ground surface at Medicine Lake Volcano, California.

Shaded relief map shows locations of Medicine Lake volcano (red out...

Shaded relief map shows locations of Medicine Lake volcano (red out...

Faults are indicated by thin black lines, Stage 5 vents by stars, caldera rim is dashed black ellipse, gray arrows at east and west sides indicate approximate direction of extension across the volcano. Blue arrows in corners show possible overall motion (see Blakely et al., 1997).

Lava tube cave at Lava Beds National Monument, Medicine Lake Volcan...

Lava tube cave: Lava Beds National Monument, Medicine Lake Volcano, CA

The horizontal traces near the floor of the cave wall are remnants of high stands of lava as it drained away during the final stages of lava-flow activity within the tube. The drip structures from the ceiling were formed as the top of the cave remelted and dripped downward due to the high temperatures within the tube system.

An instructional sign located within Lava Beds National Monument in...

An instructional sign located within Lava Beds National Monument in...

An instructional sign located within Lava Beds National Monument informs visitors how `a`a lava is formed.

Aerial view west across the upper part of Medicine Lake Volcano tow...

Aerial view west across the upper part of Medicine Lake Volcano tow...

Medicine Lake lies within the shallow basin of Medicine Lake caldera. Glass Mountain flow, draped over the east side of the volcano, is the youngest lava flow at the volcano. The northeasternmost dacite tongue extends nearly to the bottom of the photo (distal lobes are outlined to enhance visibility).