FA-71508 / Seismic magnitude estimation / Member archive

Aki maximum-likelihood b-value: minimum event count · case 03

A single event above Mc produces a b-value.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Magnitudes, completeness and bin width in tenths. Use events with M >= Mc; fewer than 2 returns None. b = log10(e) / (mean(M) - (Mc - dM/2)); non-positive denominator returns None. Return [b rounded 0.001, n, sigma = b/sqrt(n) rounded 0.001].

Why this case matters

Gutenberg-Richter b-values feed hazard rates and foreshock studies.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
catalogue 14	`[8.686, 1, 8.686]`	`null`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.