Foreshock counts may be underestimated: reversing declustering finds 30-40% more small foreshocks in Southern California
Reversing the declustering metric so that the later mainshock's magnitude, not the earlier event's, sets the correlation range recovers more small foreshocks in both synthetic catalogs and the Southern California catalog, showing that foreshock counts depend not only on earthquake physics but on the temporal symmetry built into the declustering method.