FA-71839 / Seismic magnitude estimation / Member archive

Magnitude from surface rupture length: logarithm base · case 04

Long ruptures are assigned magnitudes above 11.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Regression M = a + b log10(L km) by slip type: SS (5.16, 1.12), R (5.00, 1.22), N (4.86, 1.32), ALL (5.08, 1.16); unknown type or non-positive length returns None. Round to 0.01.

Why this case matters

Paleoseismic studies estimate prehistoric magnitudes from mapped rupture lengths.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
SS rupture 0.5 km	`4.38`	`4.82`	Failed

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