{"id":"https://openalex.org/W3162783439","doi":"https://doi.org/10.3390/s21093292","title":"Horizontal-to-Vertical Spectral Ratio of Ambient Vibration Obtained with Hilbert\u2013Huang Transform","display_name":"Horizontal-to-Vertical Spectral Ratio of Ambient Vibration Obtained with Hilbert\u2013Huang Transform","publication_year":2021,"publication_date":"2021-05-10","ids":{"openalex":"https://openalex.org/W3162783439","doi":"https://doi.org/10.3390/s21093292","mag":"3162783439","pmid":"https://pubmed.ncbi.nlm.nih.gov/34068660"},"language":"en","primary_location":{"id":"doi:10.3390/s21093292","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21093292","pdf_url":"https://www.mdpi.com/1424-8220/21/9/3292/pdf?version=1620702943","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj","pubmed"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://www.mdpi.com/1424-8220/21/9/3292/pdf?version=1620702943","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5084814577","display_name":"Maik Neukirch","orcid":"https://orcid.org/0000-0001-9558-0260"},"institutions":[{"id":"https://openalex.org/I4210107612","display_name":"Geociencias Barcelona","ror":"https://ror.org/01nsd7y51","country_code":"ES","type":"facility","lineage":["https://openalex.org/I134820265","https://openalex.org/I4210107612"]}],"countries":["ES"],"is_corresponding":true,"raw_author_name":"Maik Neukirch","raw_affiliation_strings":["Geosciences Barcelona, GEO3BCN-CSIC, C/Lluis Sol\u00e9 i Sabar\u00eds s/n, 08028 Barcelona, Spain"],"raw_orcid":"https://orcid.org/0000-0001-9558-0260","affiliations":[{"raw_affiliation_string":"Geosciences Barcelona, GEO3BCN-CSIC, C/Lluis Sol\u00e9 i Sabar\u00eds s/n, 08028 Barcelona, Spain","institution_ids":["https://openalex.org/I4210107612"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5010961513","display_name":"Antonio Garc\u00eda\u2010Jerez","orcid":"https://orcid.org/0000-0002-8971-7467"},"institutions":[{"id":"https://openalex.org/I52354020","display_name":"University of Almer\u00eda","ror":"https://ror.org/003d3xx08","country_code":"ES","type":"education","lineage":["https://openalex.org/I52354020"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Antonio Garc\u00eda-Jerez","raw_affiliation_strings":["Department of Chemistry and Physics, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain"],"raw_orcid":"https://orcid.org/0000-0002-8971-7467","affiliations":[{"raw_affiliation_string":"Department of Chemistry and Physics, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain","institution_ids":["https://openalex.org/I52354020"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5027202596","display_name":"Antonio Villase\u00f1or","orcid":"https://orcid.org/0000-0001-8592-4832"},"institutions":[{"id":"https://openalex.org/I4210151560","display_name":"Institut de Ci\u00e8ncies del Mar","ror":"https://ror.org/05ect0289","country_code":"ES","type":"facility","lineage":["https://openalex.org/I134820265","https://openalex.org/I4210151560"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Antonio Villase\u00f1or","raw_affiliation_strings":["Institute of Marine Sciences, ICM-CSIC, Passeig Mar\u00edtim de la Barceloneta 37-49, 08003 Barcelona, Spain"],"raw_orcid":"https://orcid.org/0000-0001-8592-4832","affiliations":[{"raw_affiliation_string":"Institute of Marine Sciences, ICM-CSIC, Passeig Mar\u00edtim de la Barceloneta 37-49, 08003 Barcelona, Spain","institution_ids":["https://openalex.org/I4210151560"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5073414723","display_name":"Francisco Luz\u00f3n","orcid":"https://orcid.org/0000-0002-7513-2791"},"institutions":[{"id":"https://openalex.org/I52354020","display_name":"University of Almer\u00eda","ror":"https://ror.org/003d3xx08","country_code":"ES","type":"education","lineage":["https://openalex.org/I52354020"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Francisco Luz\u00f3n","raw_affiliation_strings":["Department of Chemistry and Physics, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain"],"raw_orcid":"https://orcid.org/0000-0002-7513-2791","affiliations":[{"raw_affiliation_string":"Department of Chemistry and Physics, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain","institution_ids":["https://openalex.org/I52354020"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5011056229","display_name":"Mario Ruiz","orcid":"https://orcid.org/0000-0002-0924-8980"},"institutions":[{"id":"https://openalex.org/I4210107612","display_name":"Geociencias Barcelona","ror":"https://ror.org/01nsd7y51","country_code":"ES","type":"facility","lineage":["https://openalex.org/I134820265","https://openalex.org/I4210107612"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Mario Ruiz","raw_affiliation_strings":["Geosciences Barcelona, GEO3BCN-CSIC, C/Lluis Sol\u00e9 i Sabar\u00eds s/n, 08028 Barcelona, Spain"],"raw_orcid":"https://orcid.org/0000-0002-0924-8980","affiliations":[{"raw_affiliation_string":"Geosciences Barcelona, GEO3BCN-CSIC, C/Lluis Sol\u00e9 i Sabar\u00eds s/n, 08028 Barcelona, Spain","institution_ids":["https://openalex.org/I4210107612"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5024743638","display_name":"Luis Molina S\u00e1nchez","orcid":"https://orcid.org/0000-0002-4113-2128"},"institutions":[{"id":"https://openalex.org/I52354020","display_name":"University of Almer\u00eda","ror":"https://ror.org/003d3xx08","country_code":"ES","type":"education","lineage":["https://openalex.org/I52354020"]}],"countries":["ES"],"is_corresponding":false,"raw_author_name":"Luis Molina","raw_affiliation_strings":["Department of Biology and Geology, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain"],"raw_orcid":"https://orcid.org/0000-0002-4113-2128","affiliations":[{"raw_affiliation_string":"Department of Biology and Geology, University of Almer\u00eda, Carretera Sacramento s/n, La Ca\u00f1ada de San Urbano, 04120 Almer\u00eda, Spain","institution_ids":["https://openalex.org/I52354020"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":6,"corresponding_author_ids":["https://openalex.org/A5084814577"],"corresponding_institution_ids":["https://openalex.org/I4210107612"],"apc_list":{"value":2400,"currency":"CHF","value_usd":2598},"apc_paid":{"value":2400,"currency":"CHF","value_usd":2598},"fwci":1.1183,"has_fulltext":false,"cited_by_count":9,"citation_normalized_percentile":{"value":0.73469996,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":98},"biblio":{"volume":"21","issue":"9","first_page":"3292","last_page":"3292"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11757","display_name":"Seismic Waves and Analysis","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1908","display_name":"Geophysics"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11757","display_name":"Seismic Waves and Analysis","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/1908","display_name":"Geophysics"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10534","display_name":"Structural Health Monitoring Techniques","score":0.9987000226974487,"subfield":{"id":"https://openalex.org/subfields/2205","display_name":"Civil and Structural Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10160","display_name":"Seismic Performance and Analysis","score":0.9961000084877014,"subfield":{"id":"https://openalex.org/subfields/2205","display_name":"Civil and Structural Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/fast-fourier-transform","display_name":"Fast Fourier transform","score":0.6798081994056702},{"id":"https://openalex.org/keywords/acoustics","display_name":"Acoustics","score":0.5274391770362854},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.460929811000824},{"id":"https://openalex.org/keywords/inversion","display_name":"Inversion (geology)","score":0.43743598461151123},{"id":"https://openalex.org/keywords/spectral-density","display_name":"Spectral density","score":0.4322319030761719},{"id":"https://openalex.org/keywords/vibration","display_name":"Vibration","score":0.4245520234107971},{"id":"https://openalex.org/keywords/multitaper","display_name":"Multitaper","score":0.4160997271537781},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.31323039531707764},{"id":"https://openalex.org/keywords/seismology","display_name":"Seismology","score":0.28853917121887207},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.24270784854888916},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.14705434441566467},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.14545902609825134}],"concepts":[{"id":"https://openalex.org/C75172450","wikidata":"https://www.wikidata.org/wiki/Q623950","display_name":"Fast Fourier transform","level":2,"score":0.6798081994056702},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.5274391770362854},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.460929811000824},{"id":"https://openalex.org/C1893757","wikidata":"https://www.wikidata.org/wiki/Q3653001","display_name":"Inversion (geology)","level":3,"score":0.43743598461151123},{"id":"https://openalex.org/C168110828","wikidata":"https://www.wikidata.org/wiki/Q1331626","display_name":"Spectral density","level":2,"score":0.4322319030761719},{"id":"https://openalex.org/C198394728","wikidata":"https://www.wikidata.org/wiki/Q3695508","display_name":"Vibration","level":2,"score":0.4245520234107971},{"id":"https://openalex.org/C2777067715","wikidata":"https://www.wikidata.org/wiki/Q3327726","display_name":"Multitaper","level":2,"score":0.4160997271537781},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.31323039531707764},{"id":"https://openalex.org/C165205528","wikidata":"https://www.wikidata.org/wiki/Q83371","display_name":"Seismology","level":1,"score":0.28853917121887207},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.24270784854888916},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.14705434441566467},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.14545902609825134},{"id":"https://openalex.org/C77928131","wikidata":"https://www.wikidata.org/wiki/Q193343","display_name":"Tectonics","level":2,"score":0.0}],"mesh":[],"locations_count":8,"locations":[{"id":"doi:10.3390/s21093292","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21093292","pdf_url":"https://www.mdpi.com/1424-8220/21/9/3292/pdf?version=1620702943","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},{"id":"pmid:34068660","is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/34068660","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors (Basel, Switzerland)","raw_type":null},{"id":"pmh:oai:digital.csic.es:10261/241166","is_oa":true,"landing_page_url":"http://hdl.handle.net/10261/241166","pdf_url":null,"source":{"id":"https://openalex.org/S4306400616","display_name":"DIGITAL.CSIC (Spanish National Research Council (CSIC))","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I134820265","host_organization_name":"Consejo Superior de Investigaciones Cient\u00edficas","host_organization_lineage":["https://openalex.org/I134820265"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"art\u00edculo"},{"id":"pmh:oai:doaj.org/article:4c69653eb42347adb3ec605c8955ff5e","is_oa":true,"landing_page_url":"https://doaj.org/article/4c69653eb42347adb3ec605c8955ff5e","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-sa","license_id":"https://openalex.org/licenses/cc-by-sa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors, Vol 21, Iss 9, p 3292 (2021)","raw_type":"article"},{"id":"pmh:oai:mdpi.com:/1424-8220/21/9/3292/","is_oa":true,"landing_page_url":"https://dx.doi.org/10.3390/s21093292","pdf_url":null,"source":{"id":"https://openalex.org/S4306400947","display_name":"MDPI (MDPI AG)","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I4210097602","host_organization_name":"Multidisciplinary Digital Publishing Institute (Switzerland)","host_organization_lineage":["https://openalex.org/I4210097602"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors; Volume 21; Issue 9; Pages: 3292","raw_type":"Text"},{"id":"pmh:oai:pubmedcentral.nih.gov:8126136","is_oa":true,"landing_page_url":"https://www.ncbi.nlm.nih.gov/pmc/articles/8126136","pdf_url":null,"source":{"id":"https://openalex.org/S2764455111","display_name":"PubMed Central","issn_l":null,"issn":null,"is_oa":true,"is_in_doaj":false,"is_core":false,"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Sensors (Basel)","raw_type":"Text"},{"id":"pmh:oai:repositorio.ual.es:10835/12010","is_oa":true,"landing_page_url":"http://hdl.handle.net/10835/12010","pdf_url":null,"source":{"id":"https://openalex.org/S4306400756","display_name":"Repositorio de Patentes de la Universidad de Almer\u00eda (Universidad de Almer\u00eda)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-nc-nd","license_id":"https://openalex.org/licenses/cc-by-nc-nd","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"info:eu-repo/semantics/article"},{"id":"pmh:oai:repositorio.ual.es:10835/13272","is_oa":true,"landing_page_url":"http://hdl.handle.net/10835/13272","pdf_url":null,"source":{"id":"https://openalex.org/S4306400756","display_name":"Repositorio de Patentes de la Universidad de Almer\u00eda (Universidad de Almer\u00eda)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"","raw_type":"info:eu-repo/semantics/article"}],"best_oa_location":{"id":"doi:10.3390/s21093292","is_oa":true,"landing_page_url":"https://doi.org/10.3390/s21093292","pdf_url":"https://www.mdpi.com/1424-8220/21/9/3292/pdf?version=1620702943","source":{"id":"https://openalex.org/S101949793","display_name":"Sensors","issn_l":"1424-8220","issn":["1424-8220"],"is_oa":true,"is_in_doaj":true,"is_core":true,"host_organization":"https://openalex.org/P4310310987","host_organization_name":"Multidisciplinary Digital Publishing Institute","host_organization_lineage":["https://openalex.org/P4310310987"],"host_organization_lineage_names":["Multidisciplinary Digital Publishing Institute"],"type":"journal"},"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Sensors","raw_type":"journal-article"},"sustainable_development_goals":[{"display_name":"Sustainable cities and communities","id":"https://metadata.un.org/sdg/11","score":0.5400000214576721}],"awards":[{"id":"https://openalex.org/G2445707727","display_name":null,"funder_award_id":"RNM-194","funder_id":"https://openalex.org/F4320326754","funder_display_name":"Junta de Andaluc\u00eda"}],"funders":[{"id":"https://openalex.org/F4320324219","display_name":"Total","ror":"https://ror.org/04sk34n56"},{"id":"https://openalex.org/F4320326754","display_name":"Junta de Andaluc\u00eda","ror":"https://ror.org/01jem9c82"}],"has_content":{"grobid_xml":false,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3162783439.pdf"},"referenced_works_count":48,"referenced_works":["https://openalex.org/W135701320","https://openalex.org/W163612977","https://openalex.org/W164925819","https://openalex.org/W1514703364","https://openalex.org/W1605943185","https://openalex.org/W1649518398","https://openalex.org/W1980164401","https://openalex.org/W2000911430","https://openalex.org/W2007221293","https://openalex.org/W2028077100","https://openalex.org/W2028497691","https://openalex.org/W2053695750","https://openalex.org/W2068044470","https://openalex.org/W2094381327","https://openalex.org/W2118255382","https://openalex.org/W2132730919","https://openalex.org/W2134020554","https://openalex.org/W2137517494","https://openalex.org/W2139947173","https://openalex.org/W2153917450","https://openalex.org/W2153955898","https://openalex.org/W2167291508","https://openalex.org/W2295682443","https://openalex.org/W2306195743","https://openalex.org/W2336644919","https://openalex.org/W2470106499","https://openalex.org/W2548265485","https://openalex.org/W2593929385","https://openalex.org/W2767285518","https://openalex.org/W2807530643","https://openalex.org/W2908698640","https://openalex.org/W2944015360","https://openalex.org/W2946252365","https://openalex.org/W2954614886","https://openalex.org/W2969222579","https://openalex.org/W3005542385","https://openalex.org/W3013722049","https://openalex.org/W3015653751","https://openalex.org/W3047200585","https://openalex.org/W3111082142","https://openalex.org/W3129187165","https://openalex.org/W3135028388","https://openalex.org/W3141408015","https://openalex.org/W4206781875","https://openalex.org/W4376849658","https://openalex.org/W6630963633","https://openalex.org/W6678397702","https://openalex.org/W6738924944"],"related_works":["https://openalex.org/W4399584667","https://openalex.org/W2104261629","https://openalex.org/W3012999647","https://openalex.org/W4229785170","https://openalex.org/W3100197935","https://openalex.org/W2186632138","https://openalex.org/W2044803233","https://openalex.org/W2072173722","https://openalex.org/W2139464084","https://openalex.org/W3010189005"],"abstract_inverted_index":{"The":[0],"Horizontal-to-Vertical":[1],"Spectral":[2],"Ratio":[3],"(HVSR)":[4],"of":[5,41,44,128,168],"ambient":[6],"vibration":[7,35,50],"measurements":[8],"is":[9,23,88],"a":[10,42,144,158,166,170],"common":[11],"tool":[12],"to":[13,74,90,101,165,176],"explore":[14],"near":[15],"surface":[16],"shear":[17],"wave":[18],"velocity":[19],"(Vs)":[20],"structure.":[21],"HVSR":[22,114,138],"often":[24],"applied":[25,89],"for":[26,134],"earthquake":[27],"risk":[28],"assessments":[29],"and":[30,46,113,136,180],"civil":[31],"engineering":[32],"projects.":[33],"Ambient":[34,49],"signal":[36],"originates":[37],"from":[38,94,140],"the":[39,83,95,103,111,123,184],"combination":[40],"multitude":[43],"natural":[45],"man-made":[47],"sources.":[48],"sources":[51],"can":[52,118],"be":[53,75,119],"any":[54],"ground":[55],"motion":[56],"inducing":[57],"phenomena,":[58],"e.g.,":[59],"ocean":[60],"waves,":[61],"wind,":[62],"industrial":[63],"activity":[64],"or":[65],"road":[66],"traffic,":[67],"where":[68],"each":[69],"source":[70],"does":[71],"not":[72],"need":[73],"strictly":[76],"stationary":[77],"even":[78,105],"during":[79],"short":[80],"times.":[81],"Typically,":[82],"Fast":[84],"Fourier":[85],"Transform":[86,125],"(FFT)":[87],"obtain":[91],"spectral":[92],"information":[93],"measured":[96,142],"time":[97],"series":[98],"in":[99,183],"order":[100],"estimate":[102],"HVSR,":[104],"though":[106],"possible":[107],"non-stationarity":[108],"may":[109,156],"bias":[110],"spectra":[112],"estimates.":[115],"This":[116],"problem":[117],"alleviated":[120],"by":[121,163],"employing":[122],"Hilbert-Huang":[124],"(HHT)":[126],"instead":[127],"FFT.":[129],"Comparing":[130],"1D":[131],"inversion":[132,154],"results":[133],"FFT":[135],"HHT-based":[137,153],"estimates":[139],"data":[141,160],"at":[143],"well":[145],"studied,":[146],"urban,":[147],"permanent":[148],"station,":[149],"we":[150],"find":[151],"that":[152],"models":[155],"yield":[157],"lower":[159],"misfit":[161],"\u03c72":[162],"up":[164],"factor":[167],"25,":[169],"more":[171],"appropriate":[172],"Vs":[173],"model":[174],"according":[175],"available":[177],"well-log":[178],"lithology,":[179],"higher":[181],"confidence":[182],"achieved":[185],"model.":[186]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2025,"cited_by_count":2},{"year":2024,"cited_by_count":2},{"year":2022,"cited_by_count":3},{"year":2021,"cited_by_count":1}],"updated_date":"2026-05-22T06:13:13.366637","created_date":"2025-10-10T00:00:00"}