日本东京煤气公司1988年9月7日宣布,他们研制出新的可实现抗震对策的更高精度的控制用地震仪——“SI 传感器”,并成功地完成了其实用化的研究工作。据说该地震仪是与东京大学生产技术研究所(片山恒雄教授负责的片山研究室)共同开发研制的。它可通过瞬间地震动的强度(最大加速度值)和考虑了频率特性及持续时间影响的地震动强度指标——SI 值(频谱强度)的组合判断地震大小,并进行截止等的控制。为此,人们期待着它能广泛用于各种生产设施的地震控制。东京煤气公 Japan’s Tokyo Gas Company announced on September 7, 1988 that they have developed a new more accurate seismograph for control, a “SI sensor,” that can withstand seismic measures and successfully completed its practical research. The seismograph is said to have been developed in collaboration with the Institute of Production Technology at the University of Tokyo, Katayama Laboratory, which is headed by Professor Katayama Katayama. It determines the magnitude of the earthquake and controls the cut-off, etc., by the combination of instantaneous ground motion strength (maximum acceleration value) and ground motion strength indicator - SI value (spectrum strength) that takes into account frequency characteristics and duration effects. For this reason, it is expected that it will be widely used for earthquake control of various production facilities. Tokyo Gas Company