Vibration Prediction & Site Law · Tremor

Site law

PPV = K · (D / Q^e)^−B

The shot

Maximum instantaneous charge is what the law is predicting from — not the total.

Maximum instantaneous charge kg The largest mass detonating within one delay window.

Delay window ms Charges closer together than this are conventionally summed.

Holes on the shot count

Charge per hole kg

Host rock optional Does not change K, B or any prediction. It bounds the frequency the ground can still be carrying at each receptor.

Weathering

Receptors

Everything with a limit: houses, heritage, infrastructure, a tenement boundary.

Airblast

The other half of the compliance conversation, and the half that generates the complaints. Cube-root scaled distance, fitted to your own records.

Site law source Fitting needs an overpressure column in the records.

K Pa at SD = 1

n — slope

σ — residual scatter log₁₀ of pressure

Venting charge kg Leave at zero to use the MIC. Set it where you know what actually vents — a short-stemmed hole, an exposed booster, surface cord.

Allowable charge

The curve a shot-firer actually uses: how much can fire in one window at a given distance. Design to probability of exceedance

Target PoE

Prediction at each receptor

no receptors

Load or paste your monitoring history, set the maximum instantaneous charge, and add the receptors that carry a limit.

Each receptor is then reported with a predicted PPV, the probability that the limit is exceeded, and the charge that would bring that probability back to your target.

A single predicted number is not a compliance case. The scatter around a site law is typically a factor of two either way, which is why the probability matters more than the point estimate.

Regression

Load records to fit a site law.

Residuals

log₁₀ of measured ÷ predicted

Monitoring records

none