Lg-wave attenuation in the Australian crust
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Wei, Zhi; Kennett, Brian L. N.; Zhao, Lian-Feng
Description
We estimate the Lg-wave quality factor (Q) across the Australian continent from vertical-component Lg waveforms. A tomographic inversion is performed to construct an Lg attenuation model for 58 frequencies between 0.05 and 10.0 Hz. The available spatial resolution is approximately 1.5° × 1.5° for the 0.5–2.0 Hz band. At 1.0 Hz, the Lg-wave Q over the whole island continent varies from 50 to 1250 with an average value of 850. Significant regional variations in the Lg-wave Q images tie well with...[Show more]
dc.contributor.author | Wei, Zhi | |
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dc.contributor.author | Kennett, Brian L. N. | |
dc.contributor.author | Zhao, Lian-Feng | |
dc.date.accessioned | 2018-01-03T23:37:27Z | |
dc.identifier.issn | 0040-1951 | |
dc.identifier.uri | http://hdl.handle.net/1885/139051 | |
dc.description.abstract | We estimate the Lg-wave quality factor (Q) across the Australian continent from vertical-component Lg waveforms. A tomographic inversion is performed to construct an Lg attenuation model for 58 frequencies between 0.05 and 10.0 Hz. The available spatial resolution is approximately 1.5° × 1.5° for the 0.5–2.0 Hz band. At 1.0 Hz, the Lg-wave Q over the whole island continent varies from 50 to 1250 with an average value of 850. Significant regional variations in the Lg-wave Q images tie well with many geological features and boundaries in Australia. The cratons in western, northern and southern parts of Australia usually have higher Q values (700–1250), while the volcanic regions, sedimentary basins and orogenic areas in eastern Australia are characterized by increased attenuation (lower Q values, 50–650). We determine the frequency-dependent Q of Lg waves for different blocks across Australia, and find the frequency dependence of Q is much more complex than the traditional single power law representation. When combined with the assumed geometrical spreading relation, the Lg Q maps provide a new way of assessing potential ground motion across the continent for any event location. | |
dc.description.sponsorship | The research was supported in large part by the China Scholarship Council (grant 201604910731) and the National Natural Science Foundation of China (grants 41374065 and 41674060), with additional support from the AuScope AuSREM project. | |
dc.format.mimetype | application/pdf | |
dc.publisher | Elsevier | |
dc.rights | © 2017 Elsevier B.V. | |
dc.source | Tectonophysics | |
dc.subject | Australian continent | |
dc.subject | Lg attenuation model | |
dc.subject | Geological features | |
dc.subject | Frequency-dependent Q of Lg waves | |
dc.subject | Ground motion | |
dc.title | Lg-wave attenuation in the Australian crust | |
dc.type | Journal article | |
local.identifier.citationvolume | 717 | |
dc.date.issued | 2017 | |
local.publisher.url | https://www.elsevier.com/ | |
local.type.status | Accepted Version | |
local.contributor.affiliation | Kennett, B. L. N., Research School of Earth Sciences, The Australian National University | |
local.bibliographicCitation.startpage | 413 | |
local.bibliographicCitation.lastpage | 424 | |
local.identifier.doi | 10.1016/j.tecto.2017.08.022 | |
dcterms.accessRights | Open Access | |
dc.provenance | http://www.sherpa.ac.uk/romeo/issn/0040-1951/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 4/01/18). | |
Collections | ANU Research Publications |
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01 Wei Z et al Lg wave attenuation 2017.pdf | 5.66 MB | Adobe PDF |
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