earthquake_search

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Search earthquakes by time range, magnitude, depth, location radius, PAGER alert level, or felt reports. Supports USGS (global, richer metadata: PAGER, DYFI, ShakeMap) and EMSC, an independent global catalog operated by the European-Mediterranean Seismological Centre. For location-based queries, provide latitude, longitude, and radius_km together. A rectangular study area is expressed with min_latitude, max_latitude, min_longitude, and max_longitude — each independently optional, so a single edge is a valid constraint. Combining the box with the lat/lon/radius circle intersects the two, returning only events inside both. Both catalogs include non-tectonic records (quarry blasts, explosions) — every event carries its event_type, and event_type="earthquake" filters the rest out on USGS. USGS-specific filters (alert_level, event_type, min_felt, min_significance) are not sent when source=emsc — the response names them in ignoredFilters. Use earthquake_count first to gauge result size before requesting large result sets. A single call returns at most 20,000 events; larger result sets are retrieved by paging with offset, which is passed straight through to the upstream FDSN API. When a result is capped, nextOffset carries the offset for the following page and totalCount the full match count — or countUnavailable reports that the count lookup failed and the total is unknown.