FA-71440 / Seismic magnitude estimation / Member archive

Teleseismic body-wave magnitude: calibration interpolation · case 05

Between table nodes the correction runs backward.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

P amplitude in micrometres, period in s, epicentral distance in degrees. Valid only for 20 <= delta <= 100 and 0 < period <= 3.0 (else None). Q(delta) is linearly interpolated from [(20,6.0),(30,6.5),(40,6.8),(60,6.9),(80,7.0),(100,7.4)]. mb = log10(A/T) + Q, rounded 0.01.

Why this case matters

mb is the first teleseismic magnitude available for global events.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
0.05 um 3.0 s at 20 deg	`4.72`	`4.22`	Failed

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