FA-71684 / Seismic magnitude estimation / Member archive

Brune source radius and stress drop: angular corner frequency · case 04

Radii are 6.3 times too large and stress drops 250 times too small.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Seismic moment N*m, corner frequency Hz, shear velocity km/s; non-positive input returns None. r = 2.34 beta / (2 pi fc) in m; stress drop = 7/16 M0 / r^3 Pa. Return [r rounded 0.1 m, stress drop in MPa rounded 0.001].

Why this case matters

Stress drop characterises source physics and ground-motion scaling.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
M0 1.0e+12 fc 2.0 beta 3.2	`[3744.0, 0.0]`	`[595.9, 0.002]`	Failed

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