# Sources

- Query circle: center=(41.0100, 28.9800), radius=100 km
- Database: /home/vladimir/репозитории/_clones/eathquakes/data/databases/earthquakes.db
- DB-resident events in circle (pre-fetch): 1
- Live fetch attempted: True
- USGS fetch status: ok
- ISC fetch status: empty
- USGS events used (DB + live): 1833
- ISC events used (DB + live): 0
- Extraction time (UTC): 2026-07-18T22:23:09.519255+00:00
- Degraded: False
- PDF: summary.pdf rendered via md2pdf

Catalogs: USGS (https://earthquake.usgs.gov) and ISC (https://www.isc.ac.uk), reconciled by time+space match only (|Δt| <= 16s AND haversine <= 100km) -- magnitude is NOT a match criterion, so agencies disagreeing on magnitude for the same event is surfaced, not hidden.