What is the simplest architecture possible to mimic the behavior of aftershocks in space? Figure modified from Mignan & Broccardo (2019c). All these neural network architectures—from the most complex at left to the simplest at right—yield similar results. Following Occam’s Razor, the simplest (one unique neuron, also known as logistic regression) is likely correct. Plots generated using http://alexlenail.me/NN-SVG/.