USGS Earthquake Catalogue — Completeness Summary
==================================================
Total events loaded: 14,735
Date range: 2018-01-01 — 2019-12-30
Gutenberg-Richter b-value (M≥4.5): 1.410

Estimated catalogue completeness onset (CV < 15% over 5-year window):
  M ≥ 4.0: no clear stabilisation
  M ≥ 4.5: no clear stabilisation
  M ≥ 5.0: no clear stabilisation
  M ≥ 5.5: no clear stabilisation
  M ≥ 6.0: no clear stabilisation
  M ≥ 7.0: no clear stabilisation

NOTE: Use M≥4.5 from ~1976 onwards for global cross-correlation analysis.
Earlier data should be treated with caution — counts are systematically low.