Volume 5 - 1974: GEOSCIENCE INFORMATION - Proceedings of the 9th Meeting of the Geoscience Information Society

Proceedings of the 9th Meeting of the Geoscience Information Society held November 18, 1974 in Miami Beach, Florida US

Validation of tectonic models for an intraplate seismic zone, Charleston, South Carolina, with GPS geodetic data

Although the average strain rate in intraplate settings is 2--3 orders of magnitude lower than at plate boundaries, there are pockets of high strain rates within intraplate regions. The results of a Global Positioning System survey near the location of current seismicity (and the inferred location of the destructive 1886 Charleston, South Carolina earthquake) suggest that there is anomalous strain build-up occurring there. By reoccupying 1930 triangulation and 1980 GPS sites with six Trimble SST dual frequency receivers, a strain rate of 0.4 {times} 10{sup {minus}7} yr{sup {minus}1} was observed. At the 95% confidence level, this value is not significant; however, at a lower level of confidence ({approximately} 85%) it is about two orders of magnitude greater than the background of 10{sup {minus}9} to 10{sup {minus}10} yr{sup {minus}1}. The direction of contraction inferred from the GPS survey 66{degree} {+-} 11{degree} is in excellent agreement with the direction of the maximum horizontal stress (N 60{degree} E) in the area, suggesting that the observed strain rate is also real. 66 refs

Museum Collections Management Systems: One Size Does Not Fit All

Collections management software companies claim their product can be used for any type of collection or museum. While this is true to some extent, in actuality, they are better suited for some types of collections and do not cover the others as well. Particular collections management databases have aspects that are better suited for certain types of collections and an individual museum\u27s needs. Each system\u27s particular combination of features and characteristics may make it a better fit for some museums\u27 needs and not for others. Recommendations for collections databases are constantly sought after on the American Association of Museum\u27s Registrar\u27s Committee Listserv. The systems to be reviewed in this study are: PastPerfect, TMS, EmbARK. Argus, Re:discovery, Vernon CMS, and KE-EMu. With all of these choices available selecting the right system for a museum can be an overwhelming task. What the right system is, however, will be different for every institution. What may be a near perfect fit for one institution could result in disaster and frustration for another

Volume 3 - 1972: Proceedings of the 7th Meeting of the Geoscience Information Society

Proceedings of the 7th Meeting of the Geoscience Information Society held November 13, 1972 in Minneapolis, Minnesota US

Museum Collections Management Systems: One Size Does Not Fit All

Collections management software companies claim their product can be used for any type of collection or museum. While this is true to some extent, in actuality, they are better suited for some types of collections and do not cover the others as well. Particular collections management databases have aspects that are better suited for certain types of collections and an individual museum\u27s needs. Each system\u27s particular combination of features and characteristics may make it a better fit for some museums\u27 needs and not for others. Recommendations for collections databases are constantly sought after on the American Association of Museum\u27s Registrar\u27s Committee Listserv. The systems to be reviewed in this study are: PastPerfect, TMS, EmbARK. Argus, Re:discovery, Vernon CMS, and KE-EMu. With all of these choices available selecting the right system for a museum can be an overwhelming task. What the right system is, however, will be different for every institution. What may be a near perfect fit for one institution could result in disaster and frustration for another

Special Libraries, January 1973

Volume 64, Issue 1https://scholarworks.sjsu.edu/sla_sl_1973/1000/thumbnail.jp

The Pilot Land Data System: Report of the Program Planning Workshops

An advisory report to be used by NASA in developing a program plan for a Pilot Land Data System (PLDS) was developed. The purpose of the PLDS is to improve the ability of NASA and NASA sponsored researchers to conduct land-related research. The goal of the planning workshops was to provide and coordinate planning and concept development between the land related science and computer science disciplines, to discuss the architecture of the PLDs, requirements for information science technology, and system evaluation. The findings and recommendations of the Working Group are presented. The pilot program establishes a limited scale distributed information system to explore scientific, technical, and management approaches to satisfying the needs of the land science community. The PLDS paves the way for a land data system to improve data access, processing, transfer, and analysis, which land sciences information synthesis occurs on a scale not previously permitted because of limits to data assembly and access

Acronym dictionary

This reference was originally compiled as a tool for abstracters who need to know the expansion of acronyms they may encounter in the texts they are analyzing. It is a general rule of abstracting at the NASA Center For Aerospace Information (CASI) that acronyms are expanded in the abstract to enhance both information content and searchability. Over the last 22 years, abstracters at CASI have recorded acronyms and their expansions as they were encountered in documents. This is therefore an ad-hoc reference, rather than a systematic collection of all acronyms related to aerospace science and technology

Anelastic deformation in Iceland studied using GPS: with special reference to post-tectonic motion following the 1975-1985 krafla rifting episode, and isostatic rebound

The Krafla volcanic system is a spreading segment in north Iceland. A decade-long crustal spreading episode began there in 1975. Up to 8 m of rift-normal surface widening occurred along an 80-90 km-long section of the plate boundary. Isostatic uplift in the vicinity of the melting icecap Vatnajōkull has been proposed. A third GPS survey of a regional network surrounding the Krafla system was conducted in 1992. In 1991 a 10-point GPS network was installed and measured for the first time around Vatnajōkull. The 1991 and 1992 GPS data were processed using the Bernese software. Differencing the 1992 results with those from 1987 and 1990 revealed a regional deformation field with a maximum, rift-normal expansion rate of 4.4 cm/yr near the rift, decreasing to 3 cm/yr at large distances. The time-averaged spreading rate in north Iceland, 1.8 cm/yr, cannot account for this deformation. The vertical deformation field reveals regional uplift throughout the network area, at its maximum closest to the rift and decreasing with distance. Three different models were applied to study the postdyking ground deformation, (1) continued opening at depth on the dyke plane in an elastic halfspace, (2) stress redistribution in an elastic-viscous layered medium, and (3) stress redistribution in an elastic layer over a viscoelastic halfspace. The latter model was developed by extending mathematical techniques previously used to model surface displacements resulting from thrust faulting to the case of dyke emplacement. For the model of continuous dyking at depth, a range of dykes will fit the deformation field. Using the elastic-viscous model, the motion 1987-1990 and 1990-1992 is simulated adequately given the survey errors, but the 1987-1992 deformation is poorly fitted, suggesting that a more realistic geophysical model is required. Using the elastic-viscoelastic approach the effects of historical episodes in the region were subtracted from the observed displacement fields and the remaining motion was modelled as relaxation following the recent Krafla rifting episode. The best-fit model involves a halfspace viscosity of 1.1 x 10(^18) Pa s. The vertical field is noisy, but indicates that the Krafla dyke complex rifted the entire elastic layer. Isostatic uplift centred on Vatnajőkull is inconsistent with the vertical deformation field. The model suggests that the Krafla volcano became inactive after 1988/1989. The model further predicts that the width of the "plate boundary zone" is greater than that of Iceland itself