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Microtremor Horizontal\u2010to\u2010Vertical Spectral Ratio (mHVSR) analysis was used at 152 locations to investigate the fundamental period of the strata above three significant impedance contrasts in the region: the Riccarton Gravel, the Banks Peninsula volcanic (BPV) rock, and the deep graywacke basement bedrock. Up to three mHVSR peaks were observed in many of the mHVSR curves, with the long\u2010period (2\u20137\u2009s) peaks controlled by the BPV and\/or the underlying bedrock. As the thickness of the BPV increases, the response of the geologic strata above the basement bedrock was masked by the shallower BPV, effectively changing the definition of what constitutes the reference condition (i.e. engineering bedrock) for site response analyses. The mHVSR peaks matched the long\u2010period amplification peaks observed in the response spectra calculated from ground motions recorded during the Canterbury Earthquake Sequence events, underscoring the importance of the identification and consideration of deep impedance contrasts in site classification.<\/jats:p>","DOI":"10.1177\/87552930221130762","type":"journal-article","created":{"date-parts":[[2022,11,7]],"date-time":"2022-11-07T09:06:43Z","timestamp":1667812003000},"page":"288-309","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":17,"title":["The influence of multiple impedance contrasts on mHVSR site period estimates in the Canterbury Plains of New Zealand and implications for site classification"],"prefix":"10.1002","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5180-2247","authenticated-orcid":false,"given":"Andrew","family":"Stolte","sequence":"first","affiliation":[{"name":"The University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liam","family":"Wotherspoon","sequence":"additional","affiliation":[{"name":"The University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brady","family":"Cox","sequence":"additional","affiliation":[{"name":"Utah State University Logan UT USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clinton","family":"Wood","sequence":"additional","affiliation":[{"name":"University of Arkansas Fayetteville AR USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9266-1452","authenticated-orcid":false,"given":"Seokho","family":"Jeong","sequence":"additional","affiliation":[{"name":"Changwon National University Changwon South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Munro","sequence":"additional","affiliation":[{"name":"The University of Auckland Auckland New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,2]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-246X.2008.04020.x"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.earscirev.2006.07.004"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.soildyn.2012.06.004"},{"key":"e_1_2_13_5_1","volume-title":"Geology of the Christchurch Urban Area","author":"Brown LJ","year":"1992"},{"key":"e_1_2_13_6_1","volume-title":"NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures, Volume I: Part 1 Provisions (FEMA P\u20102082\u20101)","author":"Building Seismic Safety Council (BSSC)","year":"2020"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1785\/0120060095"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggaa342"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)GT.1943-5606.0002551"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggaa119"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.5459\/bnzsee.44.4.205-226"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1193\/122717EQS267M"},{"key":"e_1_2_13_13_1","volume-title":"Eurocode 8: Design of Structures for Earthquake Resistance (EN 1998\u20101:2004. 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