Search the USGS earthquake catalog by time range, magnitude range, and location. Location can be a bounding box (min/max latitude and longitude) or a circle (latitude, longitude, and radius_km). Defaults to the past 30 days, all magnitudes, worldwide, newest first. Returns a formatted list with magnitude, place, time, coordinates, depth, and event ids.

Get full details for a single earthquake by its USGS event id (e.g. us7000abcd, returned by the search tools). Includes magnitude, location, depth, time, felt reports, intensity, PAGER alert level, tsunami flag, and a link to the USGS event page.

List significant earthquakes from the last N days, worldwide. Uses the USGS significance score (a combination of magnitude, felt reports, and estimated impact), the same threshold as the official USGS significant events feed.

Count earthquakes matching a query without returning event details. Useful for questions like 'how many M4+ quakes hit California this year'. Supports the same time, magnitude, and location filters as search_earthquakes.

Find earthquakes near a location that have 'Did You Feel It' (DYFI) citizen reports. Returns events sorted by time with their felt report counts and maximum reported intensity. Good for 'did anyone feel a quake near San Francisco this week' questions.