{"abstract":"Magnitudes are 2.7 units low.","category":"Seismic magnitude estimation","checks":8,"contract":"Zero-to-peak amplitude in mm and P and S arrival times in s. dt = tS - tP must be positive and amplitude positive, else None. ML = log10 A + 3 log10(8 dt) - 2.92, rounded 0.01.","contract_signature":"amp_mm, t_p, t_s","evaluation_group":"w2-seismic_magnitude_estimation-s-minus-p-nomogram","failed_approach":"Moving dt outside the logarithm grows linearly with the interval.","family":"w2-seismic_magnitude_estimation-s-minus-p-nomogram-distance-proxy-factor","id":"FA-71796","implementations":{"attempt":{"sha256":"d6d1579f8531aadc3ee3f8a8b5cbe39dc05fe694fe9ff3663f9b2062f0dbf928","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(amp_mm, t_p, t_s):\n    dt = t_s - t_p\n    if dt <= 0 or amp_mm <= 0:\n        return None\n    ml = math.log10(amp_mm) + 3 * math.log10(8) * dt - 2.92\n    return round(ml, 2)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.001 mm P 3.2 S 8.7', [0.001, 3.2, 8.7], -0.99], ['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.001 mm P 5.0 S 5.0', [0.001, 5.0, 5.0], None], ['A 0.001 mm P 7.0 S 6.0', [0.001, 7.0, 6.0], None], ['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71]], [['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 0.5 mm P 5.0 S 5.0', [0.5, 5.0, 5.0], None], ['A 0.5 mm P 7.0 S 6.0', [0.5, 7.0, 6.0], None], ['A 0.5 mm P 0.0 S 1.0', [0.5, 0.0, 1.0], -0.51], ['A 23.0 mm P 10.0 S 12.5', [23.0, 10.0, 12.5], 2.34], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37]], [['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 23.0 mm P 100.0 S 160.0', [23.0, 100.0, 160.0], 6.49], ['A 23.0 mm P 5.0 S 5.0', [23.0, 5.0, 5.0], None], ['A 23.0 mm P 7.0 S 6.0', [23.0, 7.0, 6.0], None], ['A 23.0 mm P 0.0 S 1.0', [23.0, 0.0, 1.0], 1.15], ['zero amplitude', [0.0, 1.0, 3.0], None]], [['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.001 mm P 5.0 S 5.0', [0.001, 5.0, 5.0], None], ['A 0.001 mm P 7.0 S 6.0', [0.001, 7.0, 6.0], None], ['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37]], [['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 5.0 S 5.0', [0.5, 5.0, 5.0], None], ['A 0.5 mm P 7.0 S 6.0', [0.5, 7.0, 6.0], None], ['A 0.5 mm P 0.0 S 1.0', [0.5, 0.0, 1.0], -0.51], ['A 23.0 mm P 10.0 S 12.5', [23.0, 10.0, 12.5], 2.34], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37], ['A 23.0 mm P 100.0 S 160.0', [23.0, 100.0, 160.0], 6.49]]]\nfor label, args, expected in fixtures[N - 1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"fb70005d5ea8d2b9e14493a94fb365cd9f59dd23a8bcde32e4231c6b518084f5","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(amp_mm, t_p, t_s):\n    dt = t_s - t_p\n    if dt <= 0 or amp_mm <= 0:\n        return None\n    ml = math.log10(amp_mm) + 3 * math.log10(dt) - 2.92\n    return round(ml, 2)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.001 mm P 3.2 S 8.7', [0.001, 3.2, 8.7], -0.99], ['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.001 mm P 5.0 S 5.0', [0.001, 5.0, 5.0], None], ['A 0.001 mm P 7.0 S 6.0', [0.001, 7.0, 6.0], None], ['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71]], [['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 0.5 mm P 5.0 S 5.0', [0.5, 5.0, 5.0], None], ['A 0.5 mm P 7.0 S 6.0', [0.5, 7.0, 6.0], None], ['A 0.5 mm P 0.0 S 1.0', [0.5, 0.0, 1.0], -0.51], ['A 23.0 mm P 10.0 S 12.5', [23.0, 10.0, 12.5], 2.34], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37]], [['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 23.0 mm P 100.0 S 160.0', [23.0, 100.0, 160.0], 6.49], ['A 23.0 mm P 5.0 S 5.0', [23.0, 5.0, 5.0], None], ['A 23.0 mm P 7.0 S 6.0', [23.0, 7.0, 6.0], None], ['A 23.0 mm P 0.0 S 1.0', [23.0, 0.0, 1.0], 1.15], ['zero amplitude', [0.0, 1.0, 3.0], None]], [['A 0.001 mm P 100.0 S 160.0', [0.001, 100.0, 160.0], 2.12], ['A 0.001 mm P 5.0 S 5.0', [0.001, 5.0, 5.0], None], ['A 0.001 mm P 7.0 S 6.0', [0.001, 7.0, 6.0], None], ['A 0.001 mm P 0.0 S 1.0', [0.001, 0.0, 1.0], -3.21], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 3.2 S 8.7', [0.5, 3.2, 8.7], 1.71], ['A 0.5 mm P 100.0 S 160.0', [0.5, 100.0, 160.0], 4.82], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37]], [['A 0.001 mm P 10.0 S 12.5', [0.001, 10.0, 12.5], -2.02], ['A 0.5 mm P 10.0 S 12.5', [0.5, 10.0, 12.5], 0.68], ['A 0.5 mm P 5.0 S 5.0', [0.5, 5.0, 5.0], None], ['A 0.5 mm P 7.0 S 6.0', [0.5, 7.0, 6.0], None], ['A 0.5 mm P 0.0 S 1.0', [0.5, 0.0, 1.0], -0.51], ['A 23.0 mm P 10.0 S 12.5', [23.0, 10.0, 12.5], 2.34], ['A 23.0 mm P 3.2 S 8.7', [23.0, 3.2, 8.7], 3.37], ['A 23.0 mm P 100.0 S 160.0', [23.0, 100.0, 160.0], 6.49]]]\nfor label, args, expected in fixtures[N - 1]:\n    check(label, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-seismic_magnitude_estimation-s-minus-p-nomogram-distance-proxy-factor","generated_at":"2026-09-29T14:48:32.849641+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Field seismologists read ML from the S-P interval and amplitude nomogram.","root_cause":"The 8 km/s interval-to-distance factor is dropped.","sha256":"4a89ddec92b0274eac9adb8326cc3ca974af0b7dd798feaa0dd8b49d0e9e50d2","title":"S-P nomogram local magnitude: distance proxy factor · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.577,"exit_code":1,"observations":[{"actual":0.85,"check":"A 0.001 mm P 10.0 S 12.5","expected":-2.02,"passed":false},{"actual":8.98,"check":"A 0.001 mm P 3.2 S 8.7","expected":-0.99,"passed":false},{"actual":156.64,"check":"A 0.001 mm P 100.0 S 160.0","expected":2.12,"passed":false},{"actual":null,"check":"A 0.001 mm P 5.0 S 5.0","expected":null,"passed":true},{"actual":null,"check":"A 0.001 mm P 7.0 S 6.0","expected":null,"passed":true},{"actual":-3.21,"check":"A 0.001 mm P 0.0 S 1.0","expected":-3.21,"passed":true},{"actual":3.55,"check":"A 0.5 mm P 10.0 S 12.5","expected":0.68,"passed":false},{"actual":11.68,"check":"A 0.5 mm P 3.2 S 8.7","expected":1.71,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"A 0.001 mm P 10.0 S 12.5\", \"actual\": 0.85, \"expected\": -2.02, \"passed\": false}, {\"check\": \"A 0.001 mm P 3.2 S 8.7\", \"actual\": 8.98, \"expected\": -0.99, \"passed\": false}, {\"check\": \"A 0.001 mm P 100.0 S 160.0\", \"actual\": 156.64, \"expected\": 2.12, \"passed\": false}, {\"check\": \"A 0.001 mm P 5.0 S 5.0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"A 0.001 mm P 7.0 S 6.0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"A 0.001 mm P 0.0 S 1.0\", \"actual\": -3.21, \"expected\": -3.21, \"passed\": true}, {\"check\": \"A 0.5 mm P 10.0 S 12.5\", \"actual\": 3.55, \"expected\": 0.68, \"passed\": false}, {\"check\": \"A 0.5 mm P 3.2 S 8.7\", \"actual\": 11.68, \"expected\": 1.71, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.226,"exit_code":1,"observations":[{"actual":-4.73,"check":"A 0.001 mm P 10.0 S 12.5","expected":-2.02,"passed":false},{"actual":-3.7,"check":"A 0.001 mm P 3.2 S 8.7","expected":-0.99,"passed":false},{"actual":-0.59,"check":"A 0.001 mm P 100.0 S 160.0","expected":2.12,"passed":false},{"actual":null,"check":"A 0.001 mm P 5.0 S 5.0","expected":null,"passed":true},{"actual":null,"check":"A 0.001 mm P 7.0 S 6.0","expected":null,"passed":true},{"actual":-5.92,"check":"A 0.001 mm P 0.0 S 1.0","expected":-3.21,"passed":false},{"actual":-2.03,"check":"A 0.5 mm P 10.0 S 12.5","expected":0.68,"passed":false},{"actual":-1.0,"check":"A 0.5 mm P 3.2 S 8.7","expected":1.71,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"A 0.001 mm P 10.0 S 12.5\", \"actual\": -4.73, \"expected\": -2.02, \"passed\": false}, {\"check\": \"A 0.001 mm P 3.2 S 8.7\", \"actual\": -3.7, \"expected\": -0.99, \"passed\": false}, {\"check\": \"A 0.001 mm P 100.0 S 160.0\", \"actual\": -0.59, \"expected\": 2.12, \"passed\": false}, {\"check\": \"A 0.001 mm P 5.0 S 5.0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"A 0.001 mm P 7.0 S 6.0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"A 0.001 mm P 0.0 S 1.0\", \"actual\": -5.92, \"expected\": -3.21, \"passed\": false}, {\"check\": \"A 0.5 mm P 10.0 S 12.5\", \"actual\": -2.03, \"expected\": 0.68, \"passed\": false}, {\"check\": \"A 0.5 mm P 3.2 S 8.7\", \"actual\": -1.0, \"expected\": 1.71, \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}