Seismology is an independent app. It is NOT affiliated with or endorsed by any government agency or public entity, and it does not officially represent one or provide government services. It only republishes data already published by the official agencies listed in full at the end of this description.

Seismology brings together, in one app, earthquake reports from six official seismological agencies — USGS, CSN, SSN, EMSC, GeoNet and JMA — plus tsunami bulletins from the three NOAA tsunami centers, and notifies you the moment an earthquake happens near you.

■ Real-time information
Push notifications when an earthquake happens near you, based on your location and the distance to the epicenter. You can also choose to be notified only when the intensity estimated for your location is at least weak, moderate or strong.

■ Interactive map
See all recent earthquakes on a map with markers sized by magnitude and colored by depth. Zoom to your region and tap any event for full detail.

■ Data from official sources
Earthquake data comes from these six agencies and no others: USGS (United States), CSN (Chile), SSN (Mexico), EMSC (Euro-Mediterranean), GeoNet (New Zealand) and JMA (Japan). Every event shows which agency reported it.
Tsunami bulletins come from these three sources and no others, all part of NOAA (United States): NWS, NTWC and PTWC.

■ Full event details
For each earthquake: magnitude, depth, local and UTC times, distance from your location and a link to the official agency report.

■ Tsunami bulletins
Read the warnings, watches and advisories issued by the NOAA tsunami centers, with the affected area and a link to the original bulletin.

■ Community comments
Post how you felt the quake and read what others in the area are reporting. Useful to compare perceived intensity before official shake-map data arrives.

■ Filters and search
Filter by agency, minimum magnitude and distance. Search earthquakes from the last 30 days, or the full history with Pro.

■ Privacy
No account is needed for the main features. Your location is used to show nearby earthquakes; for alerts, it is sent to our server, which decides which ones to send you.

■ Free, with optional Pro
The app and its main features are free. Seismology Pro, an optional subscription, adds alerts for several locations, the estimated intensity at your location, the full earthquake history and no ads.

Seismology does not predict earthquakes and is not a replacement for official early-warning systems (ShakeAlert in the US, SASMEX in Mexico, JMA in Japan). It is an informational app showing events that have already occurred, as reported by the agencies listed below.

■ Official data sources — complete list
Earthquakes:
• USGS (United States): https://earthquake.usgs.gov
• CSN – Centro Sismológico Nacional, University of Chile: https://www.sismologia.cl
• SSN – Servicio Sismológico Nacional, UNAM (Mexico): http://www.ssn.unam.mx
• EMSC (Euro-Mediterranean): https://www.emsc-csem.org
• GeoNet (New Zealand): https://www.geonet.org.nz
• JMA (Japan): https://www.jma.go.jp
Tsunamis:
• NWS – National Weather Service, NOAA (United States): https://www.weather.gov
• NTWC – National Tsunami Warning Center, NOAA: https://www.tsunami.gov
• PTWC – Pacific Tsunami Warning Center, NOAA: https://www.tsunami.gov

The app uses no data sources other than the nine listed above.

Disclaimer: Seismology is an independent application. It is NOT affiliated with, endorsed by, or an official representative of any government agency or public entity, and it does not provide or facilitate government services. All earthquake and tsunami data is published by the third-party official sources listed above; for official and authoritative information, always refer to those sources directly.