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Site characterisation of twelve seismic monitoring stations in South East Victoria, Australia

Spatially heterogeneous ground motions generated by earthquakes are partially attributed to near surface conditions (i.e., site response), quantification of which enables the selection and calibration of region-specific ground-motion models (GMMs) used in seismic hazard assessments. The 21 September 2021 MW 5.9 earthquake, the largest magnitude earthquake instrumentally recorded in Victoria, was well recorded across the University of Melbourne’s seismic network (UMSN) in eastern Victoria, providing a rare opportunity to assess the utility of published GMMs for large-magnitude earthquakes, and thereby improve seismic hazard assessment in the region. To benchmark these ground-motion recordings, estimating seismic site response is required, in support of which we present results of site characterisation for 12 UMSN.


The analysis of surface wave components of ambient noise using microtremor surveys can provide well constrained shear-wave velocity models for the uppermost few hundred metres of the subsurface. By combining spatially averaged coherency (SPAC) and frequency-wavenumber (FK) array techniques, we retrieve multimode Rayleigh and Love phase velocity dispersion curves and Rayleigh-wave ellipticity, which we jointly invert for site-specific, near-surface shear wave velocity models. Previous studies demonstrate that incorporating dispersion of Love waves in the inversions provide stronger constraints of the uppermost shear-wave velocity structure. These inversions produced a set of representative 1-D shear wave velocity profiles for each site, which will contribute to the Australian Ground-Motion Database - a national repository of earthquake ground-motion data and site metadata for engineering applications.


Presented at the 2023 Australian Earthquake Engineering Society (AEES) National Conference

Simple

Identification info

Date (Creation)
2023-06-05
Date (Publication)
2024-05-23T04:03:10
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/149645

Identifier

Codespace

Digital Object Identifier

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Commonwealth of Australia (Geoscience Australia)

Voice
Author

Ebrahimi, R.

External Contact
Author

Allen, T.

Place and Communities Internal Contact
Author

Jones, A.

External Contact
Author

Ghasemi, H.

Place and Communities Internal Contact
Author

Attanayake, J.

External Contact
Name

Australian Earthquake Engineering Society (AEES) Conference, 23-25 November 2023, Brisbane, QLD

Purpose

Paper to be submitted to 2023 Australian Earthquake Engineering Society Annual Conference

Status
Completed
Point of contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Resource provider

Place and Communities Division

External Contact
Point of contact

Allen, T.

Place and Communities Internal Contact
Spatial representation type
Topic category
  • Geoscientific information

Extent

Extent

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

theme.ANZRC Fields of Research.rdf
  • EARTH SCIENCES

Keywords
  • shear wave velocity

Keywords
  • joint inversion,

Keywords
  • ellipticity curve

Keywords
  • dispersion curve

Keywords
  • site effects

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
Other constraints

(c) Commonwealth of Australia (Geoscience Australia) 2023

Resource constraints

Title

Australian Government Security Classification System

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 facsimile
OnLine resource

Link to Conference Page

Link to Conference Page

Distribution format
OnLine resource

Link to Paper

Link to Paper

Distribution format

Resource lineage

Statement

Paper to be submitted to 2023 Australian Earthquake Engineering Society Annual Conference

Metadata constraints

Title

Australian Government Security Classification System

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

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

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/acd2aace-7237-42d2-ba99-b1e03d307769

Title

GeoNetwork UUID

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

Commonwealth of Australia (Geoscience Australia)

Voice
Owner

Allen, T.

Place and Communities Internal Contact
Point of contact

Allen, T.

Place and Communities Internal Contact

Type of resource

Resource scope
Document
Name

Conference Abstract

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/149645

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/5167d912-6784-4371-9938-3931e84ca6f1

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/acd2aace-7237-42d2-ba99-b1e03d307769

Date info (Creation)
2019-04-08T01:55:29
Date info (Revision)
2019-04-08T01:55:29

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

 
 

Spatial extent

N
S
E
W


Keywords

dispersion curve ellipticity curve joint inversion, shear wave velocity site effects
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES

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