In his SSA presidential address (Jordan, 2014), and later in a more extended publication with coauthors (Jordan et al., 2014), Jordan presents a vision of forecast and prediction problems of earthquake system science. As experienced practitioners and in full appreciation of scientific studies on earthquake forecasting, we find it necessary to share a complementary viewpoint.

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Eight decades ago, Richter (1935) introduced the logarithmic scale for sizing earthquakes, in full appreciation of the observed multiplicative scaling of energy liberated in a seismic event, inspired from the first statistics of the frequency of shocks of various magnitudes...

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