The Global Digital Seismograph Network: A Status Report

Abstract

A global, digital seismograph network is being established to provide high-quality digital data for seismological research. It comprises several different types of seismograph systems plus data management and distribution facilities. Most of the Seismic Research Observatories, which are major elements of the digital network, have been operational for several years. Design objectives have been met for these observatories, but there are limits to the application of the data for analysis of large signals. The capabilities of the Seismic Research Observatories are not fully utilized at present and the potential exists to record additional data including broadband and very-long-period signals. Digital recorders are being installed at selected WWSSN stations to augment the geographical coverage of the existing digital network. They will also extend the capacity of the network to record large-amplitude signals. Data collected from the digital network are organized onto network-day tapes. These data files contain station and calibration information as well as waveform data.