| Title | Earthquake hazards in the Pacific Northwest of the United States. C, Discrimination of climatic, oceanic and tectonic mechanisms of cyclic marsh burial from Alsea Bay, Oregon, U.S.A. |
| Publication Type | Report |
| Year of Publication | 1991 |
| Authors | Peterson, Curt D., and Mark E. Darienzo |
| Secondary Title | U.S. Geological Survey Open-File Report. |
| Volume | no.91-441-C |
| Pagination | 53 p. |
| Institution | U.S. Geological Survey |
| City | [Denver, Colorado] |
| Call Number | OSU Libraries: Valley Microfiche TD223 .U6 no.91-441-C, Digital Open Access |
| Keywords | Alsea Bay, coastal hazards, earthquakes, geology, sediments, tsunamis |
| Notes | This paper will appear collectively with others from report no. 91-441, compiled by A.M. Rogers et al., as U.S. Geological Survey professional paper 1560. Thus, it is sometimes cited as dating from 1996, when professional paper no.1560 was published. Alsea Bay sediments show repeated "episodic events of coastal submergence in late Holocene time," characterized by "rapid and persistant subsidence followed by gradual deposition of suspended material and associated marsh emergence." The explanation that fits this pattern is subsidence associated with major earthquakes. By comparing uplift and subsidence in Alsea with other Oregon marshes, the authors estimate the location of an upper-plate flexure line on the central Oregon coast. The authors estimate the interval between seismic events is between 320 and 410 years. Maps, charts, bw photographs. |
| URL | https://pubs.usgs.gov/of/1991/0441c/report.pdf |
