Title

Sedimentology of the Astoria Formation at Beverly Beach

Date

5-30-2013 8:45 AM

Location

Health and Wellness Center (HWC) Room 105

Department

Earth Science

Session Chair

Jeff Myers

Session Title

Earth Science Senior Seminar Research: Geological Hazards Impacting US 101 at Beverly Beach, Oregon, and their Mitigation

Faculty Sponsor(s)

Jeff Myers

Presentation Type

Presentation

Abstract

The fine grained texture of the sandstones, siltstones, and claystones of the Miocene Astoria Formation near Beverly Beach, Oregon produce an unstable base for Highway 101, which has experienced numerous landslides. Previous studies have noted that the plagioclase feldspars in the rocks weather and turn to clay, producing an increasingly unstable foundation. By examining compositional and textural features of the Newport member of the Astoria Formation at Beverly Beach, I will assess the weaknesses of the layers of rock in this sequence to test the hypothesis that the clay layers at the top of the sequence pose the greatest potential for future landslides. An understanding of the structural stability of the sedimentary rocks underlying the busy Hwy 101 at Beverly Beach can help in future strategies to reduce the risk of catastrophic landslides.

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May 30th, 8:45 AM

Sedimentology of the Astoria Formation at Beverly Beach

Health and Wellness Center (HWC) Room 105

The fine grained texture of the sandstones, siltstones, and claystones of the Miocene Astoria Formation near Beverly Beach, Oregon produce an unstable base for Highway 101, which has experienced numerous landslides. Previous studies have noted that the plagioclase feldspars in the rocks weather and turn to clay, producing an increasingly unstable foundation. By examining compositional and textural features of the Newport member of the Astoria Formation at Beverly Beach, I will assess the weaknesses of the layers of rock in this sequence to test the hypothesis that the clay layers at the top of the sequence pose the greatest potential for future landslides. An understanding of the structural stability of the sedimentary rocks underlying the busy Hwy 101 at Beverly Beach can help in future strategies to reduce the risk of catastrophic landslides.