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Article: Regional and local factors in attenuation modelling: Hong Kong case study

TitleRegional and local factors in attenuation modelling: Hong Kong case study
Authors
KeywordsSeismological model
Hong Kong
Attenuation
Distant earthquakes
SPAC
Issue Date2006
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal of Asian Earth Sciences, 2006, v. 27 n. 6, p. 892-906 How to Cite?
AbstractSeismic attenuation behaviour is controlled by a large number of wave modification mechanisms. The characteristics of some of these mechanisms are specific to a local area, whilst the remainder can be generalised to the entire seismic region. Factors representing these mechanisms are often not resolved. A new attenuation modelling approach is demonstrated in this paper (using Hong Kong as a case study), to evaluate individual regional and local wave modification factors. Shear wave velocity (SWV) information for the four prevalent geological formations found in Hong Kong was first obtained: (a) at shallow depths from instrumented boreholes; (b) at depths of up to 100–200 m from measurements using the Microtremor SPatial Auto-Correlation (SPAC) technique; (c) at depths of up to 1.5 km from the monitoring of quarry blasts; and (d) at depths from 1.5 to 8 km in the hard basement rock layers from results of seismological refraction surveys. The upper-crust amplification factor calculated from the four modelled rock SWV profiles was then combined with predicted attenuation parameters to determine the upper-crust modification factor (filter function) incorporating the local wave modification characteristics associated with Hong Kong geological formations. Such functions may then be combined with the regional attenuation characteristics in that part of the South China region. A seismic attenuation model was developed by combining the upper-crust modification factor with the regional source function of intra-plate earthquakes, based on stochastic simulations. The ground shaking model developed from the presented methodology is supported by the comparison with macro-seismic data of seven historical earthquake events affecting Hong Kong.
Persistent Identifierhttp://hdl.handle.net/10722/54263
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChandler, AMen_HK
dc.contributor.authorLam, NTKen_HK
dc.contributor.authorTsang, HHen_HK
dc.date.accessioned2009-04-03T07:41:30Z-
dc.date.available2009-04-03T07:41:30Z-
dc.date.issued2006en_HK
dc.identifier.citationJournal of Asian Earth Sciences, 2006, v. 27 n. 6, p. 892-906en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/54263-
dc.description.abstractSeismic attenuation behaviour is controlled by a large number of wave modification mechanisms. The characteristics of some of these mechanisms are specific to a local area, whilst the remainder can be generalised to the entire seismic region. Factors representing these mechanisms are often not resolved. A new attenuation modelling approach is demonstrated in this paper (using Hong Kong as a case study), to evaluate individual regional and local wave modification factors. Shear wave velocity (SWV) information for the four prevalent geological formations found in Hong Kong was first obtained: (a) at shallow depths from instrumented boreholes; (b) at depths of up to 100–200 m from measurements using the Microtremor SPatial Auto-Correlation (SPAC) technique; (c) at depths of up to 1.5 km from the monitoring of quarry blasts; and (d) at depths from 1.5 to 8 km in the hard basement rock layers from results of seismological refraction surveys. The upper-crust amplification factor calculated from the four modelled rock SWV profiles was then combined with predicted attenuation parameters to determine the upper-crust modification factor (filter function) incorporating the local wave modification characteristics associated with Hong Kong geological formations. Such functions may then be combined with the regional attenuation characteristics in that part of the South China region. A seismic attenuation model was developed by combining the upper-crust modification factor with the regional source function of intra-plate earthquakes, based on stochastic simulations. The ground shaking model developed from the presented methodology is supported by the comparison with macro-seismic data of seven historical earthquake events affecting Hong Kong.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectSeismological modelen_HK
dc.subjectHong Kongen_HK
dc.subjectAttenuationen_HK
dc.subjectDistant earthquakesen_HK
dc.subjectSPACen_HK
dc.titleRegional and local factors in attenuation modelling: Hong Kong case studyen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-9120&volume=27&issue=6&spage=892&epage=906&date=2006&atitle=Regional+and+local+factors+in+attenuation+modelling:+Hong+Kong+case+studyen_HK
dc.identifier.emailTsang, HH: h.h.tsang@graduate.hku.hken_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1016/j.jseaes.2005.09.005en_HK
dc.identifier.scopuseid_2-s2.0-33745916364-
dc.identifier.hkuros137842-
dc.identifier.isiWOS:000240883900012-

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