FA-71645 / Seismic magnitude estimation / Member archive

GNSS peak ground displacement magnitude: metre to centimetre · case 05

Every station magnitude is about one unit high and small signals pass the noise gate.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

obs are [PGD in m, epicentral km]. Per station PGD in cm, R = hypocentral distance; skip PGD < 2 cm or R > 1000 km. log10(PGD) = A + B M + C M log10 R with A=-4.434, B=1.047, C=-0.138, solved for M. Return [mean M rounded 0.01, stations used] or None.

Why this case matters

GNSS PGD magnitudes do not saturate for great earthquakes in early warning.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
GNSS set 13	`[9.91, 4]`	`[9.05, 3]`	Failed

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