FA-71643 / Seismic magnitude estimation / Member archive

GNSS peak ground displacement magnitude: metre to centimetre · case 03

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

Member previewVariant 3 · 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 7	`[7.84, 1]`	`null`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.