# USGS Earthquake Monitor - Magnitude & Location Revisions — workflow

## Choose this tool

Infrastructure analysts reviewing revisions to observed seismic events. USGS event IDs distinguish magnitude and location revisions from new events.

Useful output columns: `eventId`, `magnitude`, `place`, `eventAt`, `updatedAt`, `longitude`.

## Practical workflow

Choose a USGS summary window. Keep a named baseline and compare stable event IDs on later runs. Review magnitude, coordinates and review-status revisions in your infrastructure workflow. Do not use this as an emergency alert system.

## Check the fit

USGS summary feeds only: significant_month, significant_week, 4.5_week, 2.5_day and all_day. No earthquake predictions, tsunami warning service or facility damage inference. Source revisions and event timestamps are kept separate from observation time.

## Real output sample

One selected row from a 2026-10-18 run. One saved row with selected scalar fields. Nested structures remain available in full Actor output.

Run: EfsqgzanTrXjgEAuM. Summary status: ok. Incomplete: false.

Historical bounded output from the recorded run. Current source values may differ.

```json
{
  "recordId": "us6000u35l",
  "title": "M 4.5 - Kermadec Islands, New Zealand",
  "eventId": "us6000u35l",
  "magnitude": 4.5,
  "place": "Kermadec Islands, New Zealand",
  "eventAt": "2026-10-18T12:42:22.533Z",
  "updatedAt": "2026-10-18T12:59:51.040Z",
  "longitude": -177.3838,
  "latitude": -30.1265,
  "depthKm": 10,
  "reviewStatus": "reviewed",
  "url": "https://earthquake.usgs.gov/earthquakes/eventpage/us6000u35l",
  "observedAt": "2026-10-18T15:33:13.414Z"
}
```