USGS / Search earthquakes by time, place and magnitude

Search the USGS global earthquake catalog: by date range, magnitude, depth, a circle (latitude, longitude, radius km) or a box, and PAGER alert level. Each event is a GeoJSON feature with magnitude, place name, time (ms since epoch), coordinates and depth, felt reports, tsunami flag, alert level, significance and event id (use it with usgs-earthquake-event). Without starttime the last 30 days are searched. Up to 200 events per call (default 20), newest first unless orderby says otherwise; usgs-earthquake-count first if you expect many. Bad values answer HTTP 400 at $0. Free. Credit: U.S. Geological Survey. USGS data is in the U.S. public domain.