Numerical estimates for percolation trapping thresholds in two- and three-dimensional ordinary site percolation are calculated. Threshold estimates are square 0.396, triangular 0.490, diamond 0.529, simple cubic 0.658, body-centered cubic 0.727, and face-centered cubic 0.780, with estimated accuracy better than $\pm \mathrm{0.002.}$ These are all slightly less than one minus the corresponding ordinary percolation thresholds (without trapping). These trapping thresholds appear to be described by the universal formula proposed by Galam and Mauger for ordinary percolation thresholds.

• Received 12 August 1998

DOI:https://doi.org/10.1103/PhysRevE.58.7137