SIMULATION OF THE LLL BENIOFF SEISMIC SYSTEM

摘要

For the past decade the Laboratory has conducted a seismic yield measurement program in support of the nuclear testing program at the Nevada Test Site. Initially, two stations were equipped with a short-period vertical-component seismometer and film recorder system designed by Hugo Benioff. Later this system was replaced by a long-period broad-band telemetry system. Since much of the data currently used in the seismic yield determination consists of data recorded on the Benioff system, an equivalent Benioff signal must be filtered from the data recorded on the broad-band system. To determine that signal, the Benioff system was removed from storage and set up for critical laboratory measurements. Unfortunately the damping of the seismometer and of the film recorder galvanometers could not be reconstructed in the lab. Consequently, it was necessary to deduce these values from parameter studies and from routine response tests conducted in the field prior to the recording of a nuclear event. The parameter studies were made with a recursive filter code that simulates the Benioff system.