Authors / CoAuthors
Gorbatov, A. | Saygin, E. | Kennett, B.L.N.
Abstract
Stations on the Australian continent receive a rich mixture of ambient seismic noise from the surrounding oceans and the numerous small earthquakes in the earthquakes belts to the north in Indonesia and east in Tonga-Kermadec as well as more distant source zones. The noise field at a station contains information about the structure in the vicinity of the site and this can be exploited by applying an autocorrelation procedure to continuous records. Continuous vertical component records from 242 stations (permanent and temporary) across the continent have been processed using running windows of 6 hours long with subsequent stacking. A distinctive pulse, with a time delay between 8 and 30 s from zero offset, is found in the autocorrelation results. This pulse has a frequency content between 1.5 and 3 Hz suggesting P-wave multiples trapped in the crust. Synthetic modeling, with control of multiple phases, shows that a local PmP phase can be recovered with the autocorrelation method. We are therefore able to use this identification to map out the depth to Moho across the continent, and obtain results that largely conform to those from previous studies using a combination of data from refraction, reflection profiles and receiver functions. This approach can be used for Moho depth estimation using just vertical component records and effective results can be obtained with temporary deployments of just a few months.
Product Type
nonGeographicDataset
eCat Id
72083
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External PublicationAbstract
- ( Theme )
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- 3D model
- ( Theme )
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- seismology
- ( Theme )
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- seismic velocity
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- AU
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2011-01-01T00:00:00
Creation Date
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unknown
Topic Category
geoscientificInformation
Series Information
Lineage
Unknown
Parent Information
Extents
[-46.0, -10.0, 111.0, 155.0]
Reference System
Spatial Resolution
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