Vibration Monitoring Near Sensitive Structures

Sensitive structures include any building, facility, or space where the age, construction type, contents, or operational use require tighter vibration control than standard construction thresholds. Common examples include historic buildings, museums, hospitals, pharmaceutical manufacturing facilities, laboratories, vivariums, and spaces housing precision imaging equipment or sensitive collections.

Low-level vibration monitoring uses high-sensitivity seismographs to detect ground motion at levels well below standard construction thresholds. It is typically required when work is being conducted near structures or equipment with strict manufacturer specifications or conservative vibration criteria, such as MRI machines, precision laboratory instruments, or fragile historic artifacts.

Sound pressure monitoring measures the physical pressure variations caused by sound waves in the air, often using specialized microphones calibrated to detect low-frequency or impulsive events. For sensitive structures, sound pressure monitoring captures acoustic impacts that standard decibel measurements may not fully represent, particularly for blast-related work or activities near structures with strict acoustic criteria.

We conduct a background vibration and noise study before work begins to document the levels a sensitive structure experiences under normal conditions. Using that baseline data, we work with the project team to establish a practical criterion for controlling vibration and noise effects from nearby construction, demolition, or renovation. This approach ensures the monitoring thresholds reflect the actual sensitivity of the structure rather than applying generic standards that may be too conservative or too lenient.