FA-71578 / Seismic magnitude estimation / Member archive

Clipping-aware amplitude pick: half swing · case 03

Amplitudes are double and magnitudes 0.3 high.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Integer counts. If any |sample| >= 0.95*full_scale (integer-truncated) return ["clipped", None]. Otherwise turning points are the first sample, every interior sample that is a peak (b > a and b >= c) or trough (b < a and b <= c), and the last sample; the amplitude is half the largest absolute difference between consecutive turning points. Return ["ok", amplitude].

Why this case matters

Magnitude amplitudes must not come from clipped records and use half peak-to-trough swings.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
segment 14	`["ok", 490]`	`["ok", 245.0]`	Failed

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