Computer Programs for Seismology:Special Applications to the High-Gain Long-Period Seismic Network.

摘要

This report describes several IBM 270/158 computer programs that have been applied to long-period seismic data on digital tapes. Inlcuded are reading routines for tapes generated by the high-gain long-period (HGLP) stations, rotation of the horizontal components, low-, band-, and high-pass digital filters, correlation (or matched filtering), summation of correlations, beam focusing, and ground motion retrieval. Results of applications, described elsewhere or in preparation, include extraction and amplitude determination of Rayleigh waves with signal-to-noise ratios near 1 to 10 precision amplitude and phase calibration of entire seismic systems from transducer to final record, beam forming of matched filtered outputs from the ramdomly spaced HGLP station array, and separation of colocated multiple events with time spacing as short as 150 sec or separation of events widely spaced geographically but nearly simultaneously at a given station. (Author)