FA-71457 / Seismic magnitude estimation / Member archive

Prague surface-wave magnitude: distance term log base · case 02

Ms is about 1.5 units too high.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

readings are [amplitude um, period s, distance deg]. Events with depth >= 60 km return None. Use only readings with 18 <= T <= 22, 20 <= delta <= 160 and positive amplitude; Ms_i = log10(A/T) + 1.66 log10(delta) + 3.3; return [mean rounded 0.01, count] or None.

Why this case matters

Ms remains the reference shallow-event magnitude in historical catalogues.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
Ms event 7	`[11.02, 2]`	`[6.85, 2]`	Failed

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