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.
Suggested Citation
Colman, S.M., Rosenbaum, J.G., Reynolds, R.L., Sarna-Wojcicki, A., 2000, Post-Mazama (7 KA) faulting beneath Upper Klamath Lake, Oregon: Bulletin of the Seismological Society of America, v. 90, no. 1, p. 243-247, https://doi.org/10.1785/0119990033.
ISSN: 1943-3573 (online)
Study Area
| 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 |
| DOI | 10.1785/0119990033 |
| Volume | 90 |
| Issue | 1 |
| Year Published | 2000 |
| Language | English |
| Publisher | Seismological Society of America |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 5 p. |
| First page | 243 |
| Last page | 247 |
| Country | United States |
| State | Oregon |
| Other Geospatial | Upper Klamath Lake |