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Post-Mazama (7 KA) faulting beneath Upper Klamath Lake, Oregon

Bulletin of the Seismological Society of America

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Abstract

High-resolution seismic-reflection profiles (3.5 kHz) show that a distinctive, widespread reflection occurs in the sediments beneath Upper Klamath Lake, Oregon. Coring reveals that this reflection is formed by Mazama tephra (MT), about 7 ka in age. The MT horizon is faulted in many places and locally displaced by as much as 3.1 m. Differential displacement of multiple horizons indicates recurrent fault movement, perhaps three episodes since deposition of the Mazama. The pattern of faulting indicates northeast-southwest extension beneath the lake basin.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Post-Mazama (7 KA) faulting beneath Upper Klamath Lake, Oregon
Series title:
Bulletin of the Seismological Society of America
Volume
90
Issue:
1
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
243
Last page:
247
Number of Pages:
5