EARTHQUAKE SENSOR, AND SEISMIC WAVEFORM RECORDING METHOD

摘要

PROBLEM TO BE SOLVED: To appropriately record a series of seismic waveforms even when the maximum acceleration does not appear immediately at the beginning of seismic waveforms and the acceleration increases with the lapse of time. ! SOLUTION: A reference value setting unit 18B sets on the basis of an indicator value Vi a reference value Vs for detecting a trigger point Tp for indicating the need to record seismic waveforms, a waveform recording unit 18C detects as the trigger point Tp a point of time at which a new indicator value Vi obtained by an indicator value calculating unit 18A has surpassed the reference value Vs, and seismic waveforms included in an object time region Tw equivalent to a recording time length tb retrospective from a recording start point Ts for a certain retrospective time ta are recorded as new seismic waveform data 17A into a selected record region Pw. ! COPYRIGHT: (C)2015,JPO&INPIT