USGS Earthquake Hazards Program
The past-day catalog comes from the public USGS GeoJSON feed. Automatic estimates may be revised. The app retains source identifiers and links to original reports.
Visit the sourceSources
Every map point has a source. Understand where the data comes from, why records change and what the app can and cannot tell you.
USGS Volcano Hazards Program
The bundled atlas contains metadata for 170 U.S. volcanoes. HANS notices show the latest available notices and their dates, not continuous monitoring of every volcano worldwide.
Visit the sourceNOAA Tsunami Warning Centers
Official bulletins have regional coverage. The current APK needs a configured server for its in-app feed; an official center can be opened separately. An empty feed does not establish safety.
Visit the sourceNatural Earth
The bundled offline atlas uses Natural Earth geographic data. It is a reference map, not a legal definition of borders or a navigation tool.
Visit the sourceOpenStreetMap
The optional street layer requests OSM map tiles and needs a connection. Map data is contributed by OpenStreetMap contributors under the ODbL, with attribution on the map.
Visit the sourceCDC · Preparedness
Safety materials refer to guidance from official organizations. They do not replace local instructions, an assessment of a particular building or emergency services.
Visit the sourceHow the journal is prepared
Articles explain the data and app workflows in original language and link to primary sources. They are published by the project editorial team; professional scientific or medical review is not claimed. We correct factual errors and update article dates when the content meaningfully changes.
There are no fabricated reviews, ratings or prediction promises. Measurement articles may use clearly educational examples; these do not represent actual earthquakes.