Who must indicate the location of each seismograph and its distance from the blast?

Who must indicate the location of each seismograph and its distance from the blast?

• A. The blaster
• B. The person taking seismograph reading
• C. The inspector
• D. The contractor

Answer: (B)

Documenting where each seismograph is and how far it is from the blast is the responsibility of the person taking seismograph readings. This is because the accuracy of the blast data depends on knowing the exact instrument positions and their distances from the blast. The reader uses that information to interpret the recorded ground motion correctly, compare it to permitted limits, and ensure compliance. If the person measuring and recording data doesn’t indicate each instrument’s location and distance, the results can’t be reliably analyzed or validated. The other roles may set up equipment or supervise, but the duty to label and report the precise placements rests with the seismograph reader, who collects and documents the data.

Documenting where each seismograph is and how far it is from the blast is the responsibility of the person taking seismograph readings. This is because the accuracy of the blast data depends on knowing the exact instrument positions and their distances from the blast. The reader uses that information to interpret the recorded ground motion correctly, compare it to permitted limits, and ensure compliance. If the person measuring and recording data doesn’t indicate each instrument’s location and distance, the results can’t be reliably analyzed or validated. The other roles may set up equipment or supervise, but the duty to label and report the precise placements rests with the seismograph reader, who collects and documents the data.