Monitor construction vibrations with Pocket Seismograph. Learn about PPV limits, baseline documentation, and how to use your iPhone as a first-pass construction vibration monitor.
Construction activities generate significant vibrations that travel through the ground and into nearby structures. Pile driving, heavy machinery operation, blasting, demolition, and jackhammering can all produce vibrations strong enough to damage buildings, disturb residents, and create legal liability. Understanding and documenting these vibrations is essential for responsible construction management.
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The key measurement in construction vibration monitoring is Peak Particle Velocity (PPV), measured in mm/s or inches/second. PPV describes the maximum rate at which soil particles move during a vibration event. Regulatory limits for PPV vary by country and context, but common guidelines include:
Note that smartphone-based seismographs display acceleration in g-force or m/s^2 rather than PPV directly. However, the relative comparison and trend monitoring capabilities of Pocket Seismograph are genuinely useful for preliminary assessment and ongoing monitoring even without direct PPV calibration.
When construction activity is ongoing nearby, Pocket Seismograph gives you immediate visual feedback. You can see in real time whether a particular activity (pile driving vs. excavation, for example) produces higher amplitude vibrations at your location. This is valuable for deciding whether to escalate concerns to a structural engineer or official monitoring service.
The session logging feature records every vibration session with a precise timestamp. This creates a chronological record that can be cross-referenced against the construction schedule. If a crack appears in a wall, you can check whether the construction activity at the time of discovery correlates with elevated vibration levels in your log.
Before construction begins nearby, you can use Pocket Seismograph to establish a vibration baseline at your location. This pre-construction baseline is essential for distinguishing between pre-existing conditions and construction-induced damage. Without baseline documentation, it is nearly impossible to prove that vibrations from a specific project caused specific damage.
By running the app at different locations in a building, you can identify which areas experience the strongest vibration transmission. Rooms directly above a parking garage or basement, corners of buildings, and spaces adjacent to shared walls are typically most affected.
Pocket Seismograph is an excellent first-response and ongoing awareness tool, but it has important limitations for professional construction monitoring:
It displays acceleration values, not calibrated PPV readings required for regulatory compliance
Consumer MEMS accelerometers do not meet the precision standards of professional monitoring equipment
Legal disputes typically require certified seismic monitoring reports from accredited measurement services
The recommended workflow is to use Pocket Seismograph for initial assessment and ongoing informal monitoring, and engage a professional seismic monitoring service when vibration levels seem elevated, when regulatory compliance documentation is required, or when legal action is being considered.
To get the most useful data from Pocket Seismograph near a construction site:
Place the phone on a concrete floor, structural wall, or other element directly connected to the building foundation
Avoid placing the phone on furniture, carpet, or soft surfaces that will dampen the signal
Run sessions during active construction periods and during quiet periods to establish contrast
Note the type of construction activity occurring at the time of each measurement in your own records
Take screenshots of notable waveform events for documentation purposes
Whether you are a building owner near a construction site, a facility manager responsible for sensitive equipment, or an engineer doing preliminary vibration assessment, Pocket Seismograph provides a free, immediately accessible first-pass monitoring capability.
No account, no subscription, no internet required. Just install the app, place your iPhone on a solid surface, and watch the real-time seismograph waveform.