About USGS
USGS is a curated resource from the Geology Maps collection.\n\nOpen the official site to explore features, docs, and downloads. Prefer primary project pages over mirrors.\n\nOfficial link: earthquake.usgs.gov.
Use this page to check whether USGS fits your needs before you visit earthquake.usgs.gov. We highlight access (Free), category (Useful Sites), and similar free alternatives so you can compare without hunting across random lists.
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