MEASURING METHOD OF INTENSITY OF EARTHQUAKE MOTION FOR CONTROL

摘要

PURPOSE: To provide a measuring method of the intensity of an earthquake motion, in which the degree of dispersion is reduced and which has high accuracy, in a control seismograph, etc., using an SI value as the measure of the intensity of the earthquake motion. ;CONSTITUTION: The acceleration of an earthquake motion is input, arithmetic operation satisfying the equation of motion of one freedom-degree vibration system in a set attenuation constant and a natural period is conducted, and speed response is obtained momently. The maximum value of speed response is substituted for preset estimation formula, and an estimated SI value is acquired. The regression coefficient of a regression linear equation, using the estimated SI value as a dependent variable, and an SI value obtained from definition formula as an independent variable is acquired from the Si value obtained by the definition formula regarding a large number of earthquake records and the estimated SI value acquired by the estimation formula under the desired set conditions, and an estimated SI value obtained by inputting the acceleration of the earthquake motion as an object is corrected by correction formula employing the regression coefficient.;COPYRIGHT: (C)1996,JPO