磁気バブルメモリを用いた強震動観測装置

Abstract

A digital strong motion seismograph system (SMS) is designed making use of a non-volatile, solid-state magnetic bubble memory (MBM) for recording medium during strong earthquake motion.After the strong motion or relief of earthquake damage the data in MBM are read and recorded ondigital cassette magnetic tape (CMT). Signal processing algorithm including event triggering, selection of sample rate and data compression for economy of memory area, and data acquisitionprocess for CMT are implimented by a microprocessor Z-80, with use of analog filtering techniqueand hard logic circuits. In case of power stoppage the system is supported with a battery, chargedby a thermo-controlled charger.Three events of Hyuganada earthquake swarm occuring in March 1982 were recorded with theSMS system installed at Miyazaki Crustal Deformation Observatory.