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Khite Engineering Associates, Inc. <br />Report M1o. 79:19-D June 18, 1979 <br />Utah International, Inc. Page 2 <br />'~ completely in 69 milliseconds, and Blast 2 detonated completely in 60 <br />milliseconds. By contrast, a blast of similar size monitored in September, <br />1977, required more than 1000 milliseconds to detonate. <br />Instrument Stations <br />Prior to our visit, several telephone conversations with Atr. Haanes <br />served to make preliminary station selections. These preliminary sites were <br />charged by minor degrees due to terrain considerations and accessibility. A <br />sketch map shows the approximate instrument positions in relation to the two <br />blasts. <br />Instruments <br />The instruments provided for this study were three component velocity <br />type seismographs. The sensing elements of these instruments are standard <br />moving coil seismometers of which three are mounted in mutually perpendicular <br />directions in a single case to provide a triaxial sensor. <br />`-' ~ All but one.of the instruments provided respond equally to all signals <br />in the frequency range from 1-200 Hertz. The single exception was the instrument <br />located at Station 4 (Okie Plaza), which responds flat to all signals in the <br />range from 10-200 Hertz. Appropriate correction for low frequency was applied <br />to the measurements obtained at this station. <br />The instruments located at Stations 2, 4, S, 7 and 8B were continuous <br />recording instruments that continuously measure the three components of ground <br />motion and record the peak as a bar graph on a pressure sensitive chart. All <br />other stations were equipped with full waveform seismographs that magnetically <br />record a time history of the effects. <br />The transcribed recordings from these instruments and copies of the <br />bar graph charts are attached to this report. <br />The manufacturers specifications on the:.instruments used are also <br />attached. <br />Monitoring the Effects and teasurements <br />During the morning of ,lanuary ]0, 1979, site inspections and individual <br />recording assignments were made, and a plan was developed to conduct the <br />L-2 <br />