Gutenberg Open Science: A new shear-velocity model of continental Australia based on multi-scale surface-wave tomography

Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-9512

Full metadata record

DC Field	Value	Language
dc.contributor.author	Magrini, Fabrizio	-
dc.contributor.author	Kästle, Emanuel	-
dc.contributor.author	Pilia, Simone	-
dc.contributor.author	Rawlinson, Nicholas	-
dc.contributor.author	De Siena, Luca	-
dc.date.accessioned	2023-09-14T09:37:58Z	-
dc.date.available	2023-09-14T09:37:58Z	-
dc.date.issued	2023	-
dc.identifier.uri	https://openscience.ub.uni-mainz.de/handle/20.500.12030/9530	-
dc.description.abstract	The Australian Seismological Reference Model (AuSREM) represents a state-of-the-art geophysical synthesis of the Australian continent. To date, its shear-wave component has limited resolution at lower-crustal to uppermost-mantle depths, where it is mainly constrained by sparse measurements collected at the local scale. In this study, we compile a large data set of surface-wave phase velocities based on seismic ambient noise and teleseismic earthquakes, to produce Rayleigh and Love phase-velocity maps of continental Australia in a broad period range (4–200 s). Via transdimensional Bayesian inversion, we translate the phase-velocity maps into a 3-D shear-wave velocity model extending to 300 km depth. Owing to the unprecedented seismic coverage and to the joint use of ambient-noise and teleseismic data, the retrieved model fills a tomographic gap in the known shear-wave velocity structure of the continent, comprising lower-crustal to uppermost mantle depths. Consistent with AuSREM, strong velocity heterogeneities in our model highlight the (faster) cratonic blocks and the (slower) sedimentary basins at upper-crustal depths. At mantle depths, the most prominent feature of the continent is a large-scale eastward decrease in shear-wave velocity. We interpret our observations in light of the relevant literature, and produce depth maps of the Moho and lithosphere-asthenosphere boundary (LAB). Notably, our LAB proxy features a stripe of thicker lithosphere extending to the east coast, which is not visible in the AuSREM LAB model. This observation supports the idea that lateral variations in lithospheric thickness control both the composition and volume of surface volcanism in eastern Australia.	en_GB
dc.description.sponsorship	Deutsche Forschungsgemeinschaft (DFG)\|491381577\|Open-Access-Publikationskosten 2022–2024 Universität Mainz - Universitätsmedizin	-
dc.language.iso	eng	de
dc.rights	CC BY	*
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/	*
dc.subject.ddc	550 Geowissenschaften	de_DE
dc.subject.ddc	550 Earth sciences	en_GB
dc.title	A new shear-velocity model of continental Australia based on multi-scale surface-wave tomography	en_GB
dc.type	Zeitschriftenaufsatz	de
dc.identifier.doi	http://doi.org/10.25358/openscience-9512	-
jgu.type.dinitype	article	en_GB
jgu.type.version	Published version	de
jgu.type.resource	Text	de
jgu.organisation.department	FB 09 Chemie, Pharmazie u. Geowissensch.	de
jgu.organisation.number	7950	-
jgu.organisation.name	Johannes Gutenberg-Universität Mainz	-
jgu.rights.accessrights	openAccess	-
jgu.journal.title	Journal of geophysical research : B, Solid earth	de
jgu.journal.volume	128	de
jgu.journal.issue	7	de
jgu.pages.alternative	e2023JB026688	de
jgu.publisher.year	2023	-
jgu.publisher.name	Wiley	de
jgu.publisher.place	Hoboken, NJ	de
jgu.publisher.issn	2169-9356	de
jgu.organisation.place	Mainz	-
jgu.subject.ddccode	550	de
jgu.publisher.doi	10.1029/2023jb026688	de
jgu.organisation.ror	https://ror.org/023b0x485	-
Appears in collections:	DFG-491381577-H

Files in This Item:

	File	Description	Size	Format
	a_new_shearvelocity_model_of_-20230901143512004.pdf		7.73 MB	Adobe PDF	View/Open

Show simple item record