FA-71669 / Seismic magnitude estimation / Member archive
Estimated Mercalli intensity: intensity rounding · case 04
Intensity 6.7 is reported as VI.
Case contract
R = max(hypocentral distance, 1 km). I = 1.45M - 2.46 log10(R) + 1.5, rounded half up to an integer and clamped to 1..12. Return [I, Roman numeral].
Why this case matters
ShakeMap-style intensity summaries are published as Roman numerals.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| M7.2 at 0 km depth 0.5 | [11, "XI"] | [12, "XII"] | Failed |
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