FA-71557 / Seismic magnitude estimation / Member archive

Wood-Anderson amplitude simulation: trapezoid integration · case 02

Displacement amplitudes shift by half a sample of velocity.

Member previewVariant 2 · 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 3	`0.2045`	`0.1598`	Failed

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