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The South West Seismic Zone (also identified as SWSZ) is a major intraplate earthquake province located in the south west of Western Australia.〔First named by H.A.Doyle (1971) ''Seismicity and Structure in Australia'' Royal Society of New Zealand Bulletin Vol.9 pp. 149-152〕〔M Leonard, D Darby, G Hu. (2007) GPS-geodetic monitoring of the South West Seismic Zone of Western Australia: progress after two observation epochs in 2002 and 2006( http://www.aees.org.au/Proceedings/Proceedings.html ) Intro: - The Australian southwest seismic zone (SWSZ) is a north-south trending belt of intra-plate earthquake activity that occurs in the southwest of Western Australia, bounded by 30.5°S to 32.5°S and 115.5°E to 118°E.〕 It was known earlier as the ''Yandanooka - Cape Riche Lineament'', corresponds to the physiographic boundary known as the ''Meckering Line'', and also the junction between ''Swanland'' and ''Salinaland'' 〔 - section ''Southwestern Province'' by I.R. Williams page 65〕 The zone exists within an Archaean Shield structure called the Yilgarn Block.〔 - section ''Yilgarn Block'' by I.R. Williams pages 33-81 - now called Yilgarn Craton〕 The identified geological subdivisions within this Precambrian structure do not show an obvious relation to the seismicity.〔http://www.seismicity.see.uwa.edu.au/welcome/seismicity_of_western_australia#SW〕 The zone represents a significant seismic hazard to Perth, Western Australia.〔M Leonard, D Darby, G Hu. (2007): This is one of the most seismically active areas in Australia, with nine earthquakes over magnitude 5.0 occurring between 1968 and 2002, the largest of these was the M6.8 Meckering earthquake in 1968. Since the SWSZ lies as close as ~150 km from the ~1.4 million population of the Perth region, it poses a distinct seismic hazard.〕 More than six thousand earthquakes have occurred in the SWSZ in the years 1968 - 2002.〔http://www.seismicity.see.uwa.edu.au/welcome/seismicity_of_western_australia#SW〕 Meckering, Cadoux and Burakin earthquakes originated in the SWSZ. ==Table of earthquakes== List of earthquakes of magnitude 4 or more in Southwestern Australia 1920-1961 (based in part on the records of Perth Observatory 1923-1959 and Mundaring Geophysical Observatory 1959-1980).〔Gordon, F.R and J.D. Lewis (1980) The Meckering and Calingiri earthquakes October 1968 and March 1970 Geological Survey of Western Australia Bulletin 126 ISBN 0-7244-8082-X - Appendix 1 - Catalogue of Larger earthquakes recorded in Southwestern Australia - Table 22. Earthquakes of Magnitude 4 or more -page 213〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「South West Seismic Zone」の詳細全文を読む スポンサード リンク
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