摘要:

The Apollo missions established the Moon as a cornerstone in planetary science: insights gained from this coign of vantage have stimulated research and influenced ideas for the Earth and other planets subsequently investigated using spacecraft. The history of lunar studies emphatically demonstrates the enormous progress in knowledge and understanding—a giant leap—that is made when samples from another planet become available for study in sophisticated laboratories. A few pebbles kicked loose are enough to start an avalanche, and the lunar samples are used as test beds for hypotheses about planetary, and even solar, evolution. The Moon is more accessible than any other body in the Solar System and is a potential home for a permanently occupied base with multiple purposes; it remains an important target for future work in planetary scie

ISSN:0002-8606    

DOI:10.1029/89EO00356

年代:1989

数据来源: WILEY

摘要:

The text of the Sixth Kisiel Memorial Lecture,Groundwater Contamination: Technical Analysis and Social Decision Makingby R. Allan Freeze, is available from the Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, for $5 per copy. The previous three lectures (Scale Problems in Hydrologyby James L. C. Dooge,The Emergence of Global‐Scale Hydrologyby Peter S. Eagleson, andWater Management in the United States—A Democratic Processby J . D. Bredehoeft) are also available. Copies of all four lectures may be ordered for $16 per set. Male checks payable to the University of Ariz

ISSN:0002-8606    

DOI:10.1029/EO070i047p01496-02

年代:1989

数据来源: WILEY

摘要:

At least 41 people were killed October 17 when the upper tier of the Nimitz Freeway in Oakland, Calif., collapsed during theMs= 7.1 Loma Prieta earthquake. Seismologists studying aftershocks concluded that soil conditions and resulting ground motion amplification were important in the failure of the structure and should be considered in the reconstruction of the highway.Structural design weaknesses in the two‐tiered freeway, known as the Cypress structure, had been identified before the tragedy. The seismologists, from Lamont Doherty Geological Observatory in Palisades, N.Y., and the U.S. Geological Survey in Menlo Park, Calif., found that the collapsed section was built on fill over Bay mud. A southern section of the Cypress structure built on alluvium of Quaternary age did not collapse (see Figure 1

ISSN:0002-8606    

DOI:10.1029/89EO00358

年代:1989

数据来源: WILEY

摘要:

Precise travel‐time observations of earthquake waves are necessary to constrain the asperhical structure of Earth. To enhance international cooperation in collecting and disseminating measurements made at observatories in the global seismic network, the International Seismological Observing Period (ISOP) project has been started.The International Association of Seismology and Physics of the Earth's Interior (IASPEI) organized a workshop in August in Istanbul, Turkey, at the 1989 IASPEI General Assembly, with support from UNESCO. About 50 scientists from the international seismological community came, to evaluate the past performance of the global seismic network, review technological advances, and organize the projec

ISSN:0002-8606    

DOI:10.1029/89EO00361

年代:1989

数据来源: WILEY

摘要:

The Engineering Foundation has announced a major expansion of its grant program and has extended the deadline for 1990 applications to December 15, 1989. With a grant from the U.S. Air Force Office of Scientific Research the foundation has added the new Air Force Engineering Research Initiation Grants program to parallel its ongoing Engineering Research Initiation Grants Program. For information contact the Engineering Foundation, 345 East 47th Street, New York, NY 10017; tel. 212‐705‐7835.The Office of Technology Asssessment of the U.S. Congress will select as many as six fellows for 1990–1991. The program is open to individuals working in physical and biological sciences, engineering,, law, economics, environmental and social sciences, and public policy. The annual salary ranges from $28,000 to $55,000. OTA provides congressional committees with analyses of issues involving science and technology, such as energy, agriculture, international security, environment, and education. For information contact Congressional Fellowships, Personnel Office, Office of Technology Assessment, Congress of the United States, Washington, DC 20510‐8025. Application deadline is January 3

ISSN:0002-8606    

DOI:10.1029/EO070i047p01504-03

年代:1989

数据来源: WILEY