摘要:

Only 10 years ago, most U.S. seismologists would have attributed to the dark arts any claim that earthquakes would be predictable. Yet at that very time the radical theory of global tectonics was being firmly established. Today, seismologists recognize numerous physical precursors to earthquakes. Earthquake prediction research is respectable in the scientific establishment.A valid earthquake prediction specifies location, time of occurrence, size, and probability. Successful prediction of large earthquakes can lead to great reductions in economic and life losses; to increased safety and efficiency in critical facilities such as nuclear reactors, power grid control centers, and dams; and to there turn of a populace to normal living patterns following a damaging earthquake.

ISSN:0002-8606    

DOI:10.1029/EO059i001p00036

年代:1978

数据来源: WILEY

摘要:

The similarity of the airless intensely cratered surfaces of Mercury and the moon (Figures 1a and 1b) is in striking contrast to the different densities of the two objects. The similar geologic history inferred from the surface record is surprising, since the different size and density of these two bodies might suggest different amounts of radiogenic heating, silicate/ metal ratios, and thermal conductivity (Figure 2). A conference at the Lunar Science Institute, Houston, Texas, on November 15–17, 1976, focused specifically on such comparisons between Mercury and the moon and attracted 75 attendees representing 35 institutions and a full spectrum of NASA‐supported lunar and planetary programs. Many problems concerning the geological evolution of Mercury remain unsolved, but from the papers and discussions at this meeting it is clear that possible solutions require, as a first step, the understanding of all the inner planets. Understanding the detailed history of Mercury would be extremely difficult without the framework developed for the moon. Yet without the data from Mercury the stability of this framework could never be tested. Such iterations represent a fundamental approach for not only solving planetary problems but also formulating new questi

ISSN:0002-8606    

DOI:10.1029/EO059i001p00043

年代:1978

数据来源: WILEY

摘要:

The International Symposium on the Magnetosphere and Its Environment was held in Christchurch, New Zealand, January 24–28, 1977. This symposium, organized by the Royal Society of New Zealand in conjunction with the Institute of Physics of New Zealand and cosponsored by URSI and AGU, was attended by nearly 80 scientists from 10 countries. Eight invited reviews and 39 contributed papers were presented, and the symposium concluded with a summary and discussion by a panel consisting of the invited speakers, in which highlights were reviewed and some of the outstanding problems discussed. Ample time was available for discussion throughou

ISSN:0002-8606    

DOI:10.1029/EO059i001p00048

年代:1978

数据来源: WILEY

ISSN:0002-8606    

DOI:10.1029/EO059i001p00050

年代:1978

数据来源: WILEY