Application of 3D back-projection for source properties of large events using small sets of well distributed seismic stations  

Authors / CoAuthors

Gorbatov, A. | Spiliopoulos, S. | Kennett, B.L.N.

Abstract

Studies of earthquake source characterization are often undertaken using the back-projection technique and large, dense seismic arrays. Combinations of such arrays have also been utilised in an attempt to increase the spatial resolution of the source energy distribution patterns. However our tests show that the use of few well selected seismic stations can produce comparable results to those obtained by the processing of large seismic arrays. Employing dense arrays of seismic stations may increase the signal to noise ratio, but this is not the reason behind apparent improvements in resolution of radiated energy patterns. In practice, resolution of the source energy radiation pattern relies on the same principles as those which underline earthquake hypocentre location. Back-projection techniques applied to large Mw > 7 subduction earthquakes shows that starting with small numbers of spatially separated seismic stations the correct distribution of radiated energy can be estimated. The set of spatially separated seismic stations can be selected by the same criteria as those used for accurate hypocentral location to map radiated seismic energy not only in a plane but in 3D as well. Application of this algorithm to a number of deep (>100km) earthquakes, such as the Mw 8.2 Sea of Okhotsk event, shows the further potential of the back-projection technique.

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nonGeographicDataset

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76989

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• GA PublicationPoster/Image

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_External

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2013-01-01T00:00:00

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Spatial Resolution

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