摘要:

On July 12, 1993, a large earthquake and associated tsunami caused terrible damage to the Japan Sea side of Japan, Korea, and Russia. The southwestern shore of Hokkaido and Okushiri Island were particularly hard hit. All aspects of this earthquake will undoubtedly be studied in great detail. This brief report focuses on the tectonic setting and some puzzles encountered in the preliminary seismological analysis.At first glance, the July 12 event appears to have occurred on the “wrong side” of Japan (see Figure 1). The Pacific plate subducts to the west beneath northern Honshu and Hokkaido, and a Wadati‐Benioff zone extends to 700‐km depth beneath the Sea of Japan. Great underthrusting earthquakes are expected to occur on the east coast of Honshu and Hokkaido, such as the 1968 Tokachi‐Oki (magnitude 8.2) and 1978 Miyagi‐Oki (magnitude 7.6) earthquakes. Thus, the occurrence of large, shallow, underthrusting earthquakes on the west coast of Honshu and Hokkaido is somewhat odd. Nonetheless, there is now almost a continuous linkage of the rupture areas of such earthquakes off the western coasts of Honshu and Hokkaido, and this activity extends north

ISSN:0002-8606    

DOI:10.1029/93EO00501

年代:1993

数据来源: WILEY

摘要:

Construction of AGU's new headquarters building reached a milestone with the completion of the steel structure. AGU's 120‐person staff should be moved in before the end of March 1994. The new building, located at 2000 Florida Avenue, N.W., will also be home to the headquarters operation of the American Astronomical Society (AAS). Just over 20% of the new building is still available for lease. Other scientific societies with interests related to those of AGU are prime candidates for tenancy. Through collegial relations like those established between AAS and AGU, the societies housed together can strengthen service to our community of scienc

ISSN:0002-8606    

DOI:10.1029/93EO00601

年代:1993

数据来源: WILEY

摘要:

Delbert M. Utiledied on September 6, 1991, at age 95. He had been a member of AGU (Atmospheric Sciences) since 1935.AGU FellowVincent J. Schaefer, 87, died on July 25. He joined AGU (Space Physics and Aeronomy) in 1946.

ISSN:0002-8606    

DOI:10.1029/EO074i034p00382-03

年代:1993

数据来源: WILEY

摘要:

The Earth science programs at NASA and the National Science Foundation are joining forces to support regional Global Positioning System (GPS) geodesy experiments. The combined field project support functions will be conducted by the University Navstar Consortium (UNAVCO) facility.NASA's Solid Earth Science Branch initiated the Dynamics of the Solid Earth (DOSE) program in 1992. DOSE supports a variety of investigations, including studies of crustal deformation due to tectonic plate motion, earthquakes, post‐glacial rebound, and volcanic activity. Many of these investigations require high‐precision geodetic measurements utilizing the space‐based GPS technology. NSF's Earth Sciences Division established UNAVCO in 1984 to provide equipment, technical, and related support to university investigators applying GPS technology to geosciences research. UNAVCO has since supported investigators in more than 100 regional GPS geodesy projects. The UNAVCO facility operates in Boulder, Colo., as a program of the University Corporation for Atmospheric Res

ISSN:0002-8606    

DOI:10.1029/93EO00506

年代:1993

数据来源: WILEY