Seismology, 1987, Nuclear Test Ban Verification, Earthquake and Earth Resource Investigation

摘要

The work described concerns detection seismology, local seismicity, and seismic exploration. The chapter on detection seismology can be divided into five parts. First, the current work within the Group of Scientific Experts in Geneva is described. Then a compilation is presented of the known nuclear tests performed in 1987. Third, the plans for the upgrade of the Hagfors array station are described along with some research carried out in this context. The fourth part consists of a few research notes pertaining to discrimination, depth estimation and yield estimation. The high-frequency part of the S divided by P ratio is shown to be a good discriminant at regional distances. Finally, the authors' division has been affected by the work within the Six Nation Initiative. As for the studies on local seismicity, one should note that a new local network in northern Sweden, comprising six stations, has now been taken into operation. The authors work on seismic exploration has involved two field experiments and a modelling study.