摘要:

The vast distances, poor accessibility and need for uniform accuracy in the Canadian Gravity Standardization Network (CGSN) have required that stations be connected by numerous interlocking gravity ties involving expensive air transportation of relative gravimeters. It is expected that the introduction of regular high‐accuracy absolute gravity measurements into the Canadian network will ensure that the accuracy of the network is sufficient to meet modern geodetic requirements and will render a selected number of stations suitable for geodynamic studies.As the first step in providing the required absolute measurements, the Geological Survey of Canada has acquired an absolute gravimeter of the direct free‐fall type developed by the Joint Institute for Laboratory Astrophysics (JILA), National Institute of Standards and Technology and University of Colorado, Boulder [Faller et al,1979, 19

ISSN:0002-8606    

DOI:10.1029/89EO00406

年代:1989

数据来源: WILEY

摘要:

The British Hydrological Society was formed in November 1983 in response to a growing need for a new broadly based national society. It caters to those interested in parts or all of this interdisciplinary subject and currently has more than 500 members. The organization aims to “promote interest and scholarship in both the scientific and applied aspects of hydrology and to foster the involvement of its members in international activities.”The society is an independent body formally associated with the Institution of Civil Engineers and the Institute of Hydrology in recognition of their special interests in hydrology and with a view to serving both the applied and scientific interests of its members. The affairs of the society are managed by a committee elected by its memb

ISSN:0002-8606    

DOI:10.1029/89EO00332

年代:1989

数据来源: WILEY

摘要:

During the past decades, linkages between the atmosphere, biosphere, anthrosphere, hydrosphere, cryosphere, lithosphere and cosmogenic input have been revealed. These linkages are characterized by complex integration and feedback. While the existence of this complex global system is now recognized, how it functions is poorly understood. The recent increase in CO2and other greenhouse gases as a result of human activity and, in turn, concern over the climate change which may result, require that we gain a detailed knowledge of the total global system. Signals generated by interactions within the global system can be seen in the atmosphere, “captured” within glaciers and available for our viewing in ice co

ISSN:0002-8606    

DOI:10.1029/89EO00336

年代:1989

数据来源: WILEY

摘要:

The Loma Prieta earthquake in northern California gave geophysicists an unexpected chance to mobilize a team to take portable seismographs to an earthquake region. The magnitude‐7.1 earthquake occurred Tuesday, October 17 at 5:04 P.M. Pacific Daylight Time. Less than 48 hours after the main shock, IRIS consortium seismologists from Lamont‐Doherty Geological Observatory in Palisades, N.Y., were setting up new, portable equipment around San Francisco.The ability to move quickly to the earthquake area was an unanticipated bonus of two National Science Foundation programs: IRIS, the Incorporated Research Institutions for Seismology in Arlington, Va., and NCEER, the National Center for Earthquake Engineering Research in Buffalo,

ISSN:0002-8606    

DOI:10.1029/89EO00338

年代:1989

数据来源: WILEY

摘要:

Virginia K. Tippie has become director of NOAA's National Ocean Service, which is responsible for collecting and distributing information about oceans and coastal areas.As leader of one of NOAA's five major offices, Tippie's title is Assistant Administrator of Ocean Services and Coastal Zone Management. She oversees offices that compile ocean maps, predict tides, monitor global climate and pollution, and manage coastal programs like the National Marine Sanctuary and the National Estuarine Research Reserve. Tippie was previously director of the NOAA Estuarine Program Office, which recently was made part of the office of the NOAA Administrator. From 1981–86 she directed the EPA's congressionally mandated Chesapeake Bay Program. Before that she directed the Center for Ocean Management Studies at the University of Rhode Island. Tippie has also been a special assistant to the chairman of the National Advisory Committee on Oceans and Atmospher

ISSN:0002-8606    

DOI:10.1029/89EO00342

年代:1989

数据来源: WILEY

摘要:

During May 15–17 at the IAHS Third Scientific Assembly, 57 presentations were made in three workshops: PC Methods for Groundwater Quantity and Quality Analysis and Modeling (15 presentations); PC Methods in Water Resource Systems, Precipitation Analysis, and GIS (21); and PC Methods for Flood Frequency Analysis and Flood Forecasting (21). Each presentation consisted of a PC with a demonstration program and a poster, both of which were available for one day of audience examination. Most of the PC programs were operable on a “standard” system consisting of an 80286 processor with 80287 math coprocessor, 20 Mb hard disk, EGA graphics, and 640 Kb memory. No proceedings were publ

ISSN:0002-8606    

DOI:10.1029/89EO00337

年代:1989

数据来源: WILEY

摘要:

Volcanism and associated plutonism have been dominant geologic processes from the earliest beginnings of our planet. Indeed, more than 80% of the Earth's surface is now, or originally was, of magmatic origin, and the distribution of volcanoes, past and present, reflects mantle and crustal dynamics within a context of plate tectonics. In recent decades, increasing attention has been paid to the study of the role of volcanism in global climate change. It is hardly surprising that since the flowering of the natural sciences in the 19th century, the question of how volcanoes work has been and remains one of the most fascinating and fundamental questions to challenge Earth scientists.

ISSN:0002-8606    

DOI:10.1029/89EO00343

年代:1989

数据来源: WILEY

摘要:

In response to the considerable interest expressed at the first Rock Deformation Colloquium held at the Fall 1988 AGU meeting in San Francisco, a second dinner meeting was held on Monday evening, May 8, 1989, at the Omni Hotel in Baltimore. The principal business items were a report by Steve Kirby (U.S. Geological Survey, Menlo Park, Calif.) concerning the meeting the previous day of the rock deformation steering committee and an after dinner presentation by Steve Freiman of the National Institute of Standards and Technology in Gaithersburg, Md., entitled “The Environmental Effects on Subcritical Crack Growth.” Kirby reported that a technical committee for rock deformation has been established within the Tectonophysics Section of AGU; the steering committee will attempt to establish constructive working relations with allied societies and disciplines, such as ceramics, metallurgy, materials science, structural geology, and surface science. Brian Evans of the Massachusetts Institute of Technology in Cambridge, Terry Tullis of Brown University in Providence, R.I., and Harry Green of the University of California at Davis agreed to be a subcommittee to propose a name for the technical committee, for discussion at the next steering committee meeting to be held before the 1989 Fall AGU meeting. Green also agreed to investigate the possibility of convening a special session at the Fall Meeting on the nature and mechanism of deep‐focus earthquakes. (The session is Deep Slab Deformation and Faulting, T21B and T22A, organized by Harry and Ken Creager of the University of Washington, Seattle; it will be all day on Tuesday, Decemb

ISSN:0002-8606    

DOI:10.1029/89EO00344

年代:1989

数据来源: WILEY