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Optimising back-projection for source character in 3-D

Back projection using data from extended arrays, such as USarray, has become a powerful tool for examining the high frequency radiation from major earthquakes. Energy localisation is improved when data from more than one array is employed, and so far spatial resolution has been estimated by simulation.


Fortunately, it is possible to build up the spatial resolution for back-projection from an arbitrary distribution of stations by using the configuration of the isochrons from each station passing through the target point in 3-D. It is therefore possible to test out the potential spatial resolution for a station configuration in areas of significance and thereby maximise potential resolution. As in hypocentre estimation the quality of the spatial operator is improved with good azimuthal control. As a consequence back-projection from a limited number of well-distributed stations or small arrays can be competitive with the use of much larger arrays with a limited azimuth span. This simplifies the task of near real-time processing to track the evolution of major events once a hypocentre has been estimated.


We illustrate the potential for source recovery in 3-D for the very deep Mw 8.2 event in the Sea of Okhotsk. We also investigate appropriate station configuration for subduction zone mapping for the Indonesian region where there is considerable potential for megathrust events, but the epicentral distance is too large to allow direct use of North American stations.

Simple

Identification info

Date (Publication)
2013-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/76754

Cited responsible party
Role Organisation / Individual Name Details
Author

Kennett, B.L.N.

1
Author

Gorbatov, A.

2
Author

Spiliopoulos, S.

3
Point of contact
Role Organisation / Individual Name Details
Custodian

CSEMD

Owner

Commonwealth of Australia (Geoscience Australia)

Custodian

Commonwealth of Australia (Geoscience Australia)

Voice
Topic category
  • Geoscientific information
Maintenance and update frequency
As needed
Keywords
  • External Publication

  • Abstract

Australian and New Zealand Standard Research Classification (ANZSRC)
  • Seismology and Seismic Exploration

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice
OnLine resource

Link to Publication

Link to Publication

Resource lineage

Statement

Unknown

Hierarchy level
Non geographic dataset
Other

External Publication

Description

Source data not available.

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/e2623950-32b9-1f0d-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice

Type of resource

Resource scope
Document
Name

nonGeographicDataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/76754

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/e2623950-32b9-1f0d-e044-00144fdd4fa6

Date info (Revision)
2018-04-22T08:46:18
Date info (Creation)
2013-07-26T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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