Seismic topographic scattering in the context of GW detector site selection

In this paper, we present a calculation of seismic scattering from irregular surface topography in the Born approximation. Based on US-wide topographic data, we investigate topographic scattering at specific sites to demonstrate its impact on Newtonian-noise estimation and subtraction for future gravitational-wave detectors. We find that topographic scattering at a comparatively flat site in Oregon would not pose any problems, whereas scattering at a second site in Montana leads to significant broadening of wave amplitudes in wavenumber space that would make Newtonian-noise subtraction very challenging. Therefore, it is shown that topographic scattering should be included as criterion in the site-selection process of future low-frequency gravitational-wave detectors.Comment: 16 pages, 7 figure

Mineral Industries (Volumes 1 through 40 were entitled The Ore Bin). Governing Board

Second class postage paid at Portland, Oregon. Subscription rates: I year $6; 3 years,$15. Single issues, $.75 at counter,$1 mailed

The Ore bin ; Vol. 36 No. 10 (October 1974)

The U.S. Forest Service has published the final version of regulations on the surface use of National Forest lands under the amended mining laws of 1872. These regulations became effective September 1, 1974. Although the Mining Law of 1872 is still largely intact, the new regulations place some requirements in the path of prospectors and miners operating within the boundaries of the National Forests. The Mining Law of 1872 generally gives the prospector and miner the right to enter upon the public domain, and to search for, develop, and extract a wide variety of mineral resources. The Forest Service, charged with the protection and disposition of the vegetative resources and general management of wildlife and other surface resources, has become increasingly concerned with the activities of prospectors and miners. The present regulations are aimed at better control of access roads to the mine, prospect holes, open pits, mill effluent, solid waste disposal, control of erosion and landslides, and the eventual reclamation of the site following completion of the operation. In the 49 numbered paragraphs that follow are answers to many of the questions the Forest Service anticipates will be asked by persons wanting to know about the regulations it now administers. Copies of these regulations may be obtained from the U.S. Forest Service, Portland, Oregon 97208, or from any District Ranger Station

Nineteenth biennial report of the State of Oregon Department of Geology and Mineral Industries 1972-1974.

Mode of access: Internet

The Ore bin ; Vol. 25 No. 7 (July 1963)

"It is the purpose of this paper, through a brief review of the history of Astoria, to construct a framework of the physical history of the city, to place each published geologist in his correct historical setting within the city, and to reestablish his locales so as to be presently useful."--P. 113-11

The Ore Bin ; Vol. 29 No. 4 (April 1967)

One of the most beautiful and geologically interesting parts of the Oregon coast is in the vicinity of Cape Arago near Charleston, 10 miles west of Coos Bay. Three very fine state parks have been developed here. They are (from north to south): Sunset Bay, Shore Acres, and Cape Arago State Parks ... At all three parks, erosion of tilted and faulted sandstone beds of varying hardness has resulted in a peculiar rocky scenery that has no counterpart anywhere else on the Oregon coast. In addition to the rocks, fossils, and other geologic features, the area possesses a wide variety of plants and animals and an interesting historical background