Earthquake activity check, deterministic. Answers "any recent earthquakes near this location", "how seismically active is this area right now". Queries the USGS FDSN event catalog near a lat/lon within a radius (or the global M5+ feed when no point is given) over the last N days and returns each event (magnitude, place, time, depth, PAGER alert, significance) plus a code-computed summary: count, max/avg magnitude, risk level. No LLM, no key, public domain.

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