Note: The dataset is fetched directly from the USGS URL (no local file) to avoid VizHub’s upload size limit.

Dataset C — USGS Earthquakes (M2.5+/M4.5+, Past 30 Days) – GeoJSON

Source: USGS Earthquake Hazards Program – GeoJSON feeds
Link: https://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php

What it is: Recent earthquakes with magnitude, time, depth, and location (lat/long), delivered as GeoJSON.

Fields & attribute types (VAD):

• time — time (epoch ms → Date)
• mag — quantitative
• depth_km — quantitative
• lon, lat — lat/long (spatial)
• place — categorical

Note: If the full M2.5+ 30-day feed is too large to upload, either fetch it by URL or use the smaller M4.5+ 30-day feed.