FA-71360 / Seismic magnitude estimation / Member archive

Hutton-Boore local magnitude: anelastic reference distance · case 05

All magnitudes are about 0.19 high and near-field events are biased.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input the Wood-Anderson peak-to-peak amplitude in nm, epicentral distance and depth in km. Non-positive amplitude returns None. A (mm, zero-to-peak) = p2p/2 * 1e-6; r = hypocentral distance; ML = log10(A) + 1.11 log10(r/100) + 0.00189 (r - 100) + 3.0, rounded to 0.01.

Why this case matters

Regional networks publish ML for most small and moderate earthquakes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
150 nm p2p at 12 km (depth 5)	`-2.08`	`-2.27`	Failed

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