update disasters_mashup_metadata.json

disasters_mashup_metadata.json

@@ -0,0 +1,17 @@
+{
+  "dataset_name": "US Disasters Mashup",
+  "last_updated": "2026-02-10",
+  "source": "Multi-source mashup: NOAA storms, USGS earthquakes, NTSB aviation, EPA Superfund. Published on HuggingFace (lukeslp/us-disasters-mashup) and Kaggle (lucassteuber/us-disasters-mashup)",
+  "record_count": 54575,
+  "fields": {
+    "category": "Disaster category (storm, earthquake, crash, etc.)",
+    "latitude": "Latitude coordinate",
+    "longitude": "Longitude coordinate",
+    "name": "Event name or location",
+    "date": "Date of the event",
+    "subcategory": "More specific classification",
+    "aircraft_type": "Aircraft type (for aviation events)",
+    "event_id": "Unique event identifier"
+  },
+  "notes": "Combined disaster dataset merging NOAA storms, USGS earthquakes, NTSB aviation accidents, and EPA Superfund sites. 54,575 total events. Previously only airplane_crashes.csv (5,268 records) existed locally."
+}