Deep
Ocean Seismicity from Hydroacoustic Monitoring
Earthquakes
from 1998 Axial Volcano eruption detected acoustically.
The
Acoustic Monitoring Project of the VENTS Program began continuous
monitoring of north Pacific Ocean seismicity in August 1991
using the U.S. Navy's SOund Surveillance System (SOSUS)
In May, 1996, monitoring was extended to the eastern equatorial
Pacific using moored autonomous hydrophones, with the North
Atlantic added in March, 1999. The hydroacoustic method
allows detection of low-magnitude seismicity and volcanic
activity and provides more accurate source locations than
land seismic networks.