FA-71779 / Seismic magnitude estimation / Member archive

Abe tsunami magnitude: single amplitude · case 04

Mt is 0.3 units high at every gauge.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

gauges are [crest-to-trough double amplitude m, distance km]. Only gauges with distance >= 100 km are used. H = double amplitude / 2; Mt_i = log10 H + log10 distance + 5.8. Return [mean rounded 0.01, gauges used] or None.

Why this case matters

Tsunami magnitude compares tsunami size with seismic magnitude to flag tsunami earthquakes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
tide gauges 9	`[8.36, 4]`	`[8.06, 4]`	Failed

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