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Incident detail

Earthquake events · depth_km PSI drift

Deterministic evidence · read-only
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Incident summary

DATA DRIFT · WARNING severity

RESOLVED

Earthquake events

depth_km PSI drift · drift:depth_km:psi

Earthquake events depth_km PSI drift detected. Observed metric: 0.7947742611104021; threshold: 0.3.

Occurrences2Persisted observations
Last seen3:31:14 PM
Opened
Incident key
earthquake-events:drift:depth_km: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 ea1bee3df119… · created 9/12/2026, 3:30:42 PM

Evidence

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

2 occurrences
Method
PSI
Details.Epsilon
0
Details.Baseline Bins
[1.543999958038,2.255999994278,3.75448,5,7.379999876022,10,13.735,27.470000457764,51.83]
Details.Location Shift.P95 Shift
-39.954
Details.Location Shift.Mean Shift
-2.227
Details.Location Shift.Current P95
69.275
Details.Location Shift.Baseline P95
109.229
Details.Location Shift.Current Mean
18.246
Details.Location Shift.Median Shift
9.428
Details.Location Shift.Baseline Mean
20.473
Details.Location Shift.Current Median
16.808
Details.Location Shift.Baseline Median
7.38
Details.Location Shift.Normalized Median Shift
0.686
Details.Warning Threshold
0.15
Details.Current Distribution
[0.09,0.04,0.06,0.04,0.06,0.05,0.07,0.47,0.06,0.06]
Details.Baseline Distribution
[0.10091743119266056,0.10091743119266056,0.10091743119266056,0.0871559633027523,0.11009174311926606,0.08256880733944955,0.11467889908256881,0.10091743119266056,0.10091743119266056,0.10091743119266056]
Threshold
0.3
Column Name
depth_km
Drift Result Id
247
Observed Metric
0.795
Baseline Version
1
Current Sample Count
100
Baseline Sample Count
218
View raw evidence JSON
{
  "method": "PSI",
  "details": {
    "epsilon": 0.000001,
    "baseline_bins": [
      1.543999958038,
      2.255999994278,
      3.75448,
      5,
      7.379999876022,
      10,
      13.735,
      27.470000457764,
      51.83
    ],
    "location_shift": {
      "p95_shift": -39.95395000000002,
      "mean_shift": -2.2270887631218983,
      "current_p95": 69.27499999999998,
      "baseline_p95": 109.22895,
      "current_mean": 18.246388008833407,
      "median_shift": 9.42800012397766,
      "baseline_mean": 20.473476771955305,
      "current_median": 16.808,
      "baseline_median": 7.379999876022341,
      "normalized_median_shift": 0.6859633324464015
    },
    "warning_threshold": 0.15,
    "current_distribution": [
      0.09,
      0.04,
      0.06,
      0.04,
      0.06,
      0.05,
      0.07,
      0.47,
      0.06,
      0.06
    ],
    "baseline_distribution": [
      0.10091743119266056,
      0.10091743119266056,
      0.10091743119266056,
      0.0871559633027523,
      0.11009174311926606,
      0.08256880733944955,
      0.11467889908256881,
      0.10091743119266056,
      0.10091743119266056,
      0.10091743119266056
    ]
  },
  "threshold": 0.3,
  "column_name": "depth_km",
  "drift_result_id": 247,
  "observed_metric": 0.7947742611104021,
  "baseline_version": 1,
  "current_sample_count": 100,
  "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.

3 events
  1. OPENED

    Earthquake events depth_km PSI drift detected. Observed metric: 1.4419486166581055; threshold: 0.3.

    OPEN
  2. OBSERVED AGAIN

    Earthquake events depth_km PSI drift detected. Observed metric: 0.7947742611104021; threshold: 0.3.

    OPEN toOPEN
  3. RESOLVED

    depth_km 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:247{"column": "depth_km", "method": "PSI", "metric": 0.7947742611104021, "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 9/12/2026, 3:31:17 PM · new analysis