Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Locations of the Global Seismographic Network (GSN) stations. USGS GSN sites are shown as pink circles and IRIS/IDA stations are shown as green circles. (as of October 2024)
Public Domain.
