A direct velocity recording seismograph capable of recording the continuous wave form of the 3 mutually perpendicular components of motions, in terms of particle velocity, shall be used.
All field seismographs shall be capable of internal dynamic calibration and shall be calibrated according to the manufacturers' specifications at least once per year.
All seismographs shall be operated by competent individuals trained in the correct use of seismographs. Seismograph records shall be analyzed and interpreted by an independent third party approved by the Office of the Fire Marshal.
Each seismograph shall have a frequency response from 2 to 150 hertz or greater, and a velocity range from 0.0 to 2.0 inches per second or greater.