Abstract
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.
Original language | English (US) |
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Pages (from-to) | 2573-2578 |
Number of pages | 6 |
Journal | Geophysical Research Letters |
Volume | 40 |
Issue number | 11 |
DOIs | |
State | Published - Jun 16 2013 |
Externally published | Yes |
Keywords
- CTBTO
- array processing
- hydroacoustics
- low frequency
- seismometer
ASJC Scopus subject areas
- Geophysics
- General Earth and Planetary Sciences