FA-71424 / Seismic magnitude estimation / Member archive

Equivalent magnitude of a swarm: energy inversion · case 04

The equivalent magnitude of a single M5 event is reported as M11.25.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Surface-wave magnitudes of a swarm; energy per event log10 E = 1.5 Ms + 4.8 (J). Sum energies and invert to the single equivalent magnitude. Return [Meq rounded 0.01, total energy "%.2e"] or None for an empty swarm.

Why this case matters

Swarm summaries compare cumulative energy release with single earthquakes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
swarm 9	`[5.85, "5.04e+08"]`	`[2.6, "5.04e+08"]`	Failed

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