Using hydroacoustic stations as water column seismometers
Article first published online: 7 JUN 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 11, pages 2573–2578, 16 June 2013
How to Cite
2013), Using hydroacoustic stations as water column seismometers, Geophys. Res. Lett., 40, 2573–2578, doi:10.1002/grl.50371., , , and (
- Issue published online: 3 JUL 2013
- Article first published online: 7 JUN 2013
- Accepted manuscript online: 21 MAR 2013 08:32AM EST
- Manuscript Revised: 15 MAR 2013
- Manuscript Accepted: 15 MAR 2013
- Manuscript Received: 1 FEB 2013
- low frequency;
- array processing
 Getting seismic data from the deep oceans usually involves ocean-bottom seismometers, but hydrophone arrays may provide a practical alternative means of obtaining vector data. We here explore this possibility using hydrophone stations of the International Monitoring System, which have been used to study icebergs and T-wave propagation among others. These stations consist of three hydrophones at about the depth of the deep sound channel in a horizontal triangle array with 2 km sides. We use data from these stations in the very low-frequency regime (0.01–0.05 Hz band) to demonstrate that these stations can also be used as water column seismometers. By differencing the acoustic pressure, we obtain vector quantities analogous to what a seismometer would record. Comparing processed hydrophone station records of the 2004 Great Sumatra-Andaman Earthquake with broadband seismograms from a nearby island station, we find that the differenced hydrophones are indeed a practical surrogate for seismometers.