FA-71389 / Seismic magnitude estimation / Member archive

Network magnitude from station magnitudes: tenth rounding · case 04

An exact x.x5 median such as 3.25 is published as 3.2.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Station magnitudes are integers in hundredths (None = no reading; 0 and negatives are valid). Require min_stations readings; take the median (mean of the middle pair for even counts), keep stations within 50 hundredths of it inclusive, require min_stations again, take the median of the kept set and round half up to 0.1 magnitude. Return [magnitude, kept count] or None.

Why this case matters

The published event magnitude is a robust network average of station magnitudes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
event 5	`[1.6, 8]`	`[1.7, 8]`	Failed

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