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.
Acoustic Flow Monitor signal example from a small lahar in the early morning of October 6, 2004. Ground vigrations (y-axis) increase as the lahar passes the station.
