Figure 8.

Constant contours for the transient activity. For one shock of duration D and temperature T, the b-values are constant along hyperbolic-like curves. One pulse of short duration and high temperature induces the same b-value as a pulse of longer duration but smaller temperature. (A) The contours are less steep for a linear detection T - 37, than (B), for an exponential detection e^{α(T - 37)} - 1. Here β = 0.02min^-1 and α = 0.4°C^-1.