FA-71760 / Seismic magnitude estimation / Member archive

Station magnitude correction update: correction sign · case 05

Applying the corrections doubles the station bias instead of removing it.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

events are [station, station magnitude, network magnitude]. Residual = station - network; residuals with |r| > 1.0 are discarded (exactly 1.0 kept). A station with at least min_n kept residuals gets correction = -mean(kept) rounded 0.01, otherwise 0.0. Return [[station, correction, kept count]] sorted by station.

Why this case matters

Station corrections remove site amplification bias from future station magnitudes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
update 1	`[["GHI", 0.0, 1], ["JKL", -0.1, 3]]`	`[["GHI", 0.0, 1], ["JKL", 0.1, 3]]`	Failed

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