{
  "schema_version": 1,
  "discovery_version": "1.0.0",
  "title": "USGS M4.5+ earthquakes — past 24 hours",
  "definition": {
    "schema_version": 1,
    "title": "USGS M4.5+ earthquakes — past 24 hours",
    "metric_key": "m45_past_day_count",
    "meaning": "Reported magnitude 4.5+ earthquakes in the past-day feed",
    "measure_type": "event_count",
    "units": "earthquakes reported in USGS past-day feed",
    "value_encoding": "decimal_string",
    "geography": "Global",
    "category": "Natural hazards",
    "frequency": "daily",
    "seasonal_adjustment": null,
    "index_base": null,
    "transformation": null,
    "reference_time": "Rolling past-day window; source_timestamp is publisher feed generation time.",
    "retrieval_time": "retrieved_at is when Angeloi fetched the source; it is not the publisher release time.",
    "publication_time": "Not inferred from reference dates. Consult the original source when an exact publication time is required.",
    "change_unit": "quoted_units",
    "freshness_limit_hours": 1,
    "upstream_poll_interval_minutes": 15,
    "collection_enabled": true,
    "limitations": [
      "Rolling past-day snapshot, not a calendar-day total or a business indicator.",
      "Related links indicate context, not causation, equivalent units or synchronized periods."
    ],
    "publisher": {
      "oracle_id": "usgs-earthquakes",
      "name": "USGS Earthquake Hazards Program",
      "source_url": "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_day.geojson",
      "attribution": "U.S. Geological Survey — Earthquake Hazards Program, M4.5+ past-day GeoJSON feed"
    }
  },
  "related_nodes": [],
  "guide": "/guide.json",
  "id": "https://angeloi.net/nodes/earthquakes-m45-past-day",
  "oracle": "usgs-earthquakes",
  "base": null,
  "quote": null,
  "units": "earthquakes reported in USGS past-day feed",
  "node_id": "earthquakes-m45-past-day",
  "source_date": "2026-10-18",
  "value": "9",
  "retrieved_at": "2026-10-18T00:30:51.695Z",
  "source_url": "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_day.geojson",
  "source_sha256": "47d820df2ec960dfba2884e2fc225be36831610f1186a0895f834b4c74bfa88a",
  "source_timestamp": "2026-10-18T00:30:08.000Z",
  "window_start": "2026-10-17T00:30:08.000Z",
  "window_end": "2026-10-18T00:30:08.000Z",
  "frequency": "daily",
  "source_period": "2026-10-18",
  "source_date_semantics": "publisher observation/effective date",
  "status": "ok",
  "reasons": [],
  "attribution": "U.S. Geological Survey — Earthquake Hazards Program, M4.5+ past-day GeoJSON feed",
  "history": "/nodes/earthquakes-m45-past-day/history.json",
  "revisions": "/nodes/earthquakes-m45-past-day/revisions.json?date=2026-10-18",
  "receipt": "/oracles/usgs-earthquakes/receipts/47d820df2ec960dfba2884e2fc225be36831610f1186a0895f834b4c74bfa88a.json"
}