FAILURE MAP
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FA-71731 / Seismic magnitude estimation / Open access

Regional conversion to Mw: unknown type handling · case 01

Md and lower-case ml values are published as Mw unchanged.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Unrecognised magnitude types fall through as identity conversions.

VERIFIED REPAIR

Return None for unsupported types.

Unsuccessful approach: Returning the raw value still presents it as Mw.

Case contract

Case-sensitive type. ML: < 3.5 -> 0.8 ML + 0.6; 3.5..6.0 -> ML; > 6.0 None. mb: 3.5..6.2 -> 1.54 mb - 2.54, else None. Ms: <= 6.1 -> 0.67 Ms + 2.07; 6.1 < Ms <= 8.2 -> 0.99 Ms + 0.08; else None. Other types None. Round half up to 0.1 via floor(x*10 + 0.5)/10.

Why this case matters

Homogenised catalogues convert heterogeneous magnitudes to a common Mw.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(mtype, value):
    if mtype == "ML":
        if value > 6.0:
            return None
        x = 0.8 * value + 0.6 if value < 3.5 else value
    elif mtype == "mb":
        if not (3.5 <= value <= 6.2):
            return None
        x = 1.54 * value - 2.54
    elif mtype == "Ms":
        if value > 8.2:
            return None
        x = 0.67 * value + 2.07 if value <= 6.1 else 0.99 * value + 0.08
    else:
        x = value
    return math.floor(x * 10 + 0.5) / 10
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.4', ['mb', 3.4], None], ['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['Ms 6.1', ['Ms', 6.1], 6.2], ['Ms 6.2', ['Ms', 6.2], 6.2], ['Ms 8.2', ['Ms', 8.2], 8.2], ['Ms 8.3', ['Ms', 8.3], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['ML 6.9', ['ML', 6.9], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Ms 6.0', ['Ms', 6.0], 6.1], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
ML 2.02.22.2Passed
ML 3.43.33.3Passed
ML 3.53.53.5Passed
ML 4.84.84.8Passed
ML 6.06.06.0Passed
ML 6.1NoneNonePassed
Md 3.03.0NoneFailed
ml 4.04.0NoneFailed

SHA-256 / a16a1a70579614eb84472032572a39d24dddc6b821922fe0ecc4a77b63b0c579

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(mtype, value):
    if mtype == "ML":
        if value > 6.0:
            return None
        x = 0.8 * value + 0.6 if value < 3.5 else value
    elif mtype == "mb":
        if not (3.5 <= value <= 6.2):
            return None
        x = 1.54 * value - 2.54
    elif mtype == "Ms":
        if value > 8.2:
            return None
        x = 0.67 * value + 2.07 if value <= 6.1 else 0.99 * value + 0.08
    else:
        return value
    return math.floor(x * 10 + 0.5) / 10
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.4', ['mb', 3.4], None], ['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['Ms 6.1', ['Ms', 6.1], 6.2], ['Ms 6.2', ['Ms', 6.2], 6.2], ['Ms 8.2', ['Ms', 8.2], 8.2], ['Ms 8.3', ['Ms', 8.3], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['ML 6.9', ['ML', 6.9], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Ms 6.0', ['Ms', 6.0], 6.1], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
ML 2.02.22.2Passed
ML 3.43.33.3Passed
ML 3.53.53.5Passed
ML 4.84.84.8Passed
ML 6.06.06.0Passed
ML 6.1NoneNonePassed
Md 3.03.0NoneFailed
ml 4.04.0NoneFailed

SHA-256 / 3b2755290a5c7a6bf958dfeb4023b0b0e06563c29049119029ef1189a6e5a58b

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json
import math
N = 1
observations = []
def solve(mtype, value):
    if mtype == "ML":
        if value > 6.0:
            return None
        x = 0.8 * value + 0.6 if value < 3.5 else value
    elif mtype == "mb":
        if not (3.5 <= value <= 6.2):
            return None
        x = 1.54 * value - 2.54
    elif mtype == "Ms":
        if value > 8.2:
            return None
        x = 0.67 * value + 2.07 if value <= 6.1 else 0.99 * value + 0.08
    else:
        return None
    return math.floor(x * 10 + 0.5) / 10
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.4', ['mb', 3.4], None], ['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 2.0', ['ML', 2.0], 2.2], ['ML 3.4', ['ML', 3.4], 3.3], ['Ms 6.1', ['Ms', 6.1], 6.2], ['Ms 6.2', ['Ms', 6.2], 6.2], ['Ms 8.2', ['Ms', 8.2], 8.2], ['Ms 8.3', ['Ms', 8.3], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['ML 3.4', ['ML', 3.4], 3.3], ['ML 3.5', ['ML', 3.5], 3.5], ['ML 4.8', ['ML', 4.8], 4.8], ['ML 6.0', ['ML', 6.0], 6.0], ['ML 6.1', ['ML', 6.1], None], ['ML 6.9', ['ML', 6.9], None], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]], [['mb 3.5', ['mb', 3.5], 2.9], ['mb 5.0', ['mb', 5.0], 5.2], ['mb 6.2', ['mb', 6.2], 7.0], ['mb 6.3', ['mb', 6.3], None], ['Ms 4.0', ['Ms', 4.0], 4.8], ['Ms 6.0', ['Ms', 6.0], 6.1], ['Md 3.0', ['Md', 3.0], None], ['ml 4.0', ['ml', 4.0], None]]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
ML 2.02.22.2Passed
ML 3.43.33.3Passed
ML 3.53.53.5Passed
ML 4.84.84.8Passed
ML 6.06.06.0Passed
ML 6.1NoneNonePassed
Md 3.0NoneNonePassed
ml 4.0NoneNonePassed

SHA-256 / 9c33446a328a462ea1409a230651621d822c5edb2fc04e2efa27beb93b75e0b1

Verification & scope

Stipulated deterministic teaching model of a seismological magnitude procedure; constants and tables are fixed by the contract and no claim of agency or standards conformance is made. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:48:32.257470+00:00.

Case digest / 625a3405bda79fe0b7897b4b93c6ffc0b6c235b0293b2f344cbe8aef8d3aa5e1