FA-71553 / Seismic magnitude estimation / Member archive

Wood-Anderson amplitude simulation: mean removal · case 03

Traces with a DC offset integrate into huge drifting displacements.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Velocity-sensor counts, sensitivity counts per m/s, sample interval s. Remove the mean, convert to m/s, integrate with the trapezoid rule from 0, take the maximum absolute displacement, multiply by the Wood-Anderson gain 2080 and convert to mm. Return mm rounded to 1e-4, None for an empty trace.

Why this case matters

Wood-Anderson amplitudes are the input to local magnitude.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
trace 6	`0.0071`	`0.0088`	Failed

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