Coordinating Global Seismic Network observations



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 project.