Table 2

Productivity Linear Regression Results

SlopeInterceptAdjusted SlopeAdjusted Interceptp‐Value
Aftershock counts
North0.72 ± 0.64−2.89 ± 3.770.82 ± 0.13−3.50 ± 0.070.0058
South0.86 ± 0.31−3.30 ± 1.99−3.02 ± 0.07
RJ parameterization
North0.24 ± 0.601.75 ± 3.560.55 ± 0.15−0.14 ± 0.095×10−5
South0.69 ± 0.460.04 ± 2.920.89 ± 0.09

Uncertainties are 1 standard deviation. Slope and intercept are the coefficients of the best‐fitting line to the productivities versus magnitudes in each of the populations shown, in which the productivities are measured either by aftershock counts or by the RJ (Reasenberg and Jones, 1989) parameterization. Because the slopes between north and south are not significantly different, adjusted slope is the best‐fitting single slope, and adjusted intercept is the intercept using the adjusted slope. The final column is the p‐value from an F‐test used in an analysis of covariance to determine whether the intercepts are different.