FA-71800 / Seismic magnitude estimation / Member archive

S-P nomogram local magnitude: distance proxy factor · case 05

Magnitudes are 2.7 units low.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Zero-to-peak amplitude in mm and P and S arrival times in s. dt = tS - tP must be positive and amplitude positive, else None. ML = log10 A + 3 log10(8 dt) - 2.92, rounded 0.01.

Why this case matters

Field seismologists read ML from the S-P interval and amplitude nomogram.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
A 0.001 mm P 10.0 S 12.5	`-4.73`	`-2.02`	Failed

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