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Earthquake events · magnitude PSI drift

Deterministic evidence · read-only
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Incident summary

DATA DRIFT · WARNING severity

RESOLVED

Earthquake events

magnitude PSI drift · drift:magnitude:psi

Earthquake events magnitude PSI drift detected. Observed metric: 0.30987739655919366; threshold: 0.3.

Occurrences5Persisted observations
Last seen5:27:06 AM
Opened
Incident key
earthquake-events:drift:magnitude:psi
Resolved

Deterministic root cause

A ranked explanation derived from persisted evidence. It is authoritative for this view; optional AI is shown later.

No AI inference
Top ranked causeDISTRIBUTION SHIFT
HIGH confidence

Probable cause: distribution shift. Evidence: psi distribution shift. Confidence: HIGH. Affected downstream assets: 3.

Ranked candidates

#1 DISTRIBUTION SHIFTHIGH confidencescore 10

Evidence used

psi distribution shiftDRIFT_RESULT · drift_resultsweight 10

Algorithm deterministic-rca-v1 · fingerprint 0c0a280bc640… · created 9/6/2026, 5:26:38 AM

Evidence

Human-readable fields are the first view. Raw JSON remains available when exact payload inspection is useful.

5 occurrences
Method
PSI
Details.Epsilon
0
Details.Baseline Bins
[0.734,1,1.291,1.5,1.7,1.88,2.1,2.46,3.624]
Details.Location Shift.P95 Shift
0.135
Details.Location Shift.Mean Shift
-0.004
Details.Location Shift.Current P95
4.635
Details.Location Shift.Baseline P95
4.5
Details.Location Shift.Current Mean
1.903
Details.Location Shift.Median Shift
-0.1
Details.Location Shift.Baseline Mean
1.907
Details.Location Shift.Current Median
1.6
Details.Location Shift.Baseline Median
1.7
Details.Location Shift.Normalized Median Shift
-0.087
Details.Warning Threshold
0.15
Details.Current Distribution
[0.07407407407407407,0.1111111111111111,0.2037037037037037,0.09259259259259259,0.037037037037037035,0.1111111111111111,0.12962962962962962,0.05555555555555555,0.037037037037037035,0.14814814814814814]
Details.Baseline Distribution
[0.10091743119266056,0.0963302752293578,0.10550458715596331,0.05963302752293578,0.11926605504587157,0.11467889908256881,0.0963302752293578,0.10550458715596331,0.10091743119266056,0.10091743119266056]
Threshold
0.3
Column Name
magnitude
Drift Result Id
38
Observed Metric
0.31
Baseline Version
1
Current Sample Count
54
Baseline Sample Count
218
View raw evidence JSON
{
  "method": "PSI",
  "details": {
    "epsilon": 0.000001,
    "baseline_bins": [
      0.734,
      1,
      1.291,
      1.5,
      1.7,
      1.88,
      2.1,
      2.46,
      3.624
    ],
    "location_shift": {
      "p95_shift": 0.1349999999999989,
      "mean_shift": -0.004219458969446865,
      "current_p95": 4.634999999999999,
      "baseline_p95": 4.5,
      "current_mean": 1.9025925925925926,
      "median_shift": -0.09999999999999987,
      "baseline_mean": 1.9068120515620395,
      "current_median": 1.6,
      "baseline_median": 1.7,
      "normalized_median_shift": -0.08695652173913032
    },
    "warning_threshold": 0.15,
    "current_distribution": [
      0.07407407407407407,
      0.1111111111111111,
      0.2037037037037037,
      0.09259259259259259,
      0.037037037037037035,
      0.1111111111111111,
      0.12962962962962962,
      0.05555555555555555,
      0.037037037037037035,
      0.14814814814814814
    ],
    "baseline_distribution": [
      0.10091743119266056,
      0.0963302752293578,
      0.10550458715596331,
      0.05963302752293578,
      0.11926605504587157,
      0.11467889908256881,
      0.0963302752293578,
      0.10550458715596331,
      0.10091743119266056,
      0.10091743119266056
    ]
  },
  "threshold": 0.3,
  "column_name": "magnitude",
  "drift_result_id": 38,
  "observed_metric": 0.30987739655919366,
  "baseline_version": 1,
  "current_sample_count": 54,
  "baseline_sample_count": 218
}

Blast radius

Downstream assets captured when this incident was evaluated.

Open dataset lineage
USGS Quality EvaluationPROCESS · distance 1
dataset:earthquake-eventsprocess:quality-usgs
Quality APIAPI · distance 2
dataset:earthquake-eventsprocess:quality-usgsapi:quality
Quality DashboardDASHBOARD · distance 3
dataset:earthquake-eventsprocess:quality-usgsapi:qualityui:quality-dashboard

Lifecycle

Chronological state transitions recorded for this incident.

6 events
  1. OPENED

    Earthquake events evaluation error magnitude PSI drift quality rule. Observed: none. Expected: none.

    OPEN
  2. OBSERVED AGAIN

    Earthquake events magnitude PSI drift detected. Observed metric: 1.5854854316528442; threshold: 0.3.

    OPEN toOPEN
  3. OBSERVED AGAIN

    Earthquake events magnitude PSI drift detected. Observed metric: 1.6054413118185962; threshold: 0.3.

    OPEN toOPEN
  4. OBSERVED AGAIN

    Earthquake events magnitude PSI drift detected. Observed metric: 0.4108664936146654; threshold: 0.3.

    OPEN toOPEN
  5. OBSERVED AGAIN

    Earthquake events magnitude PSI drift detected. Observed metric: 0.30987739655919366; threshold: 0.3.

    OPEN toOPEN
  6. RESOLVED

    magnitude drift recovered.

    OPEN toRESOLVED

AI Incident Copilot

Optional explanatory context based on the same persisted evidence. It cannot change incident state.

Optional · non-authoritative
FALLBACKdeterministic-fallback · deterministic-rca-v1
Deterministic OpenDQ analysis identifies distribution shift as the leading explanation with high confidence.

This explanation follows the persisted deterministic RCA result. The leading cause is distribution shift; the AI provider was not used or was unavailable.

Evidence highlights

drift-result:38{"column": "magnitude", "method": "PSI", "metric": 0.30987739655919366, "status": "DRIFT", "threshold": 0.3}

Suggested investigation

  1. Compare the current distribution with the stored baseline and inspect the affected column.

Uncertainties

No additional uncertainties recorded.

Prompt incident-copilot-v1 · generated 9/6/2026, 5:27:12 AM · new analysis