FA-71809 / Seismic magnitude estimation / Member archive

S-P nomogram local magnitude: nomogram constant · case 04

All nomogram magnitudes are 5.84 units high.

Member previewVariant 4 · 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 100.0 S 160.0	`7.96`	`2.12`	Failed

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