FA-71630 / Seismic magnitude estimation / Member archive

Omori-Utsu expected aftershock count: empty window rejection · case 05

A zero-length window returns a zero forecast instead of None.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Rate K/(t+c)^p aftershocks per day. Expected count on [t1, t2] days: for p == 1 (within 1e-12) K ln((t2+c)/(t1+c)); otherwise K((t1+c)^(1-p) - (t2+c)^(1-p))/(p-1). t1 < 0 or t2 <= t1 returns None. Round to 0.001.

Why this case matters

Aftershock forecasts integrate the Omori-Utsu rate over the forecast window.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
K 50.0 c 0.05 p 0.8 window 0.0-0.0 d	`-0.0`	`null`	Failed

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