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Vs30, the time-averaged shear-wave velocity ( Vs) in the upper 30 meters, is a key index adopted by the earthquake engineering community to account for seismic site conditions. USGS has compiled measured VS30 funded by the USGS and other governmental agencies for 4389 sites in the United States.

Use this web application to obtain earthquake hazards data from the U.S. Hazard Model.

This Webapp can be used to visualize and explore the inventory of published USGS 3D geological models.

The Chesapeake Data Catalog Application is designed to allow users to identify and interact with datasets used in and across efforts related to the USGS Chesapeake Bay Watershed studies. Metadata gathered for items included in the Catalog for which this app was developed are intended to inform users of dataset details, indicate best practice

This interactive geonarrative will take you on a guided tour to explore the science, capabilities, and history of the USGS St. Petersburg Coastal and Marine Science Center.

Discover USGS Library print and digital books, journals, maps, and other materials in our collection. Browse millions of scholarly citations and abstracts from the online catalog.

USGS Library Guides are developed and maintained by professional librarians to connect users to relevant resources and research strategies. Content is updated regularly to ensure accuracy and relevancy.

Search an archive of more than 500,000 still photographs, slides, glass plate slides, lantern slides, negatives, and sketches dating from the 1870s and taken by USGS scientists as part of their field studies.

Search the authoritative catalog for USGS peer reviewed scientific publications including USGS publication series, journal articles, books, book chapters, other government and nongovernment publications, cooperator publications, and conference proceedings.

The Volcano Notification Service (VNS) is a free service that sends you notification emails about volcanic activity happening at US monitored volcanoes. You can customize the VNS to only deliver notifications for certain volcanoes, or a range of volcanoes, as well as choose the separate notification types you want to receive.

This interactive map displays the location of water-quality data-collection sites, the drainage area for the Merrimack River, and selected streams in the Merrimack River Basin.

The U.S. Geological Survey WaterAlert service provides notifications to your email or phone for changes in water conditions based on thresholds you choose.