摘要 :
One-dimensional shear-wave velocity (VS) profiles are presented at 50 strong motion sites in New South Wales and Victoria, Australia. The VS profiles are estimated with the spectral analysis of surface waves (SASW) method. The S...
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One-dimensional shear-wave velocity (VS) profiles are presented at 50 strong motion sites in New South Wales and Victoria, Australia. The VS profiles are estimated with the spectral analysis of surface waves (SASW) method. The SASW method is a noninvasive method that indirectly estimates the VS at depth from variations in the Rayleigh wave phase velocity at the surface. This project focuses on the measurement of shear-wave velocity (VS) of the near-surface materials at strong motion recording stations in Australia. During two measurement periods, data were collected in the states of Western Australia, South Australia, Victoria, and New South Wales. These states are only regionally instrumented with permanent seismometer recording stations, although these stations have been supplemented with more closely spaced temporary aftershock recorders in response to local seismic activity. The VS profiles presented in this report are useful for calibration of siteamplification models based on direct measurement of velocity, by topography, or by surface geologic unit. Data presented here were collected using the continuous sine wave source spectral analysis of surface waves (CSS-SASW) test presented by Kayen and others (2004), which is a stepped-sine wave notch-filtered methodology that improves on the approach of Satoh and others (1991). CSS-SASW is an inexpensive and efficient means of non-invasively estimating the near-surface VS of the ground. Although it is possible to measure VS in cased boreholes or during penetration tests, these approaches tend not to be useful for evaluation of Australian strong motion sites as they can not reach the meaningful depths required for seismic site response analysis without expensive drilling and casing. Because many of the Australian sites are stiff saprolitic profiles of in-place weathered rock, penetration methods are not useful
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摘要 :
During the summer of 1929, Dr. Charles M. Breder, Jr., employed at that time by the New York Aquarium and American Museum of Natural History, visited the Carnegie Laboratory in the Dry Tortugas to study the development and habits ...
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During the summer of 1929, Dr. Charles M. Breder, Jr., employed at that time by the New York Aquarium and American Museum of Natural History, visited the Carnegie Laboratory in the Dry Tortugas to study the development and habits of flying fishes and their allies. The diary of the trip was donated to the Mote Marine Laboratory Library by his family. Dr. Breder's meticulous handwritten account gives us the opportunity to see the simple yet great details of his observations and field experiments. His notes reveal the findings and thoughts of one of the world's greatest ichthyologists. The diary was transcribed as part of the Coastal Estuarine Data/Document Rescue and Archeology effort for South Florida.
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Point Hope is a village located on a narrow gravel spit extending eight miles out into the Chukchi Sea. Studies to locate an adequate fresh water source for the village have yielded two possible supplies which will fill the needs ...
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Point Hope is a village located on a narrow gravel spit extending eight miles out into the Chukchi Sea. Studies to locate an adequate fresh water source for the village have yielded two possible supplies which will fill the needs of the village. The first is a ground water supply existing on top of the undulating permafrost layer which underlies the gravel spit. This supply consists of several million gallons of water and can be augmented with snow fences which will drift blowing snow into areas where it will drain into the aquifer when it melts. Excess water will overflow the sides of the natural permafrost basin into the ocean on both sides of the spit. The second source is a small lake located approximately four miles from the village. The lake provides water of adequate quality and quantity to be used as a raw water supply; however, this source is not as desirable since it is surface water and supports a higher level of bacterial contamination. In addition, it is a much greater distance from the village and longer and much more expensive piping would be required to get the water to the village. (Author)
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摘要 :
Methods of synthesis of intermediates and monomers for the synthesis of siloxane-modified polycarbonates are described. All substances are appropriately characterized. Precursors of polymers with both M-phenylene and P-phenylene m...
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Methods of synthesis of intermediates and monomers for the synthesis of siloxane-modified polycarbonates are described. All substances are appropriately characterized. Precursors of polymers with both M-phenylene and P-phenylene moieties as well as precursors of polymers with disiloxanylene, trisiloxanylene, and tetrasiloxanylene groupings are reported. (Author)
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