{"id":"https://openalex.org/W2016013984","doi":"https://doi.org/10.1029/jb089ib11p09305","title":"An improved method for determining the regional stress tensor using earthquake focal mechanism data: Application to the San Fernando Earthquake Sequence","display_name":"An improved method for determining the regional stress tensor using earthquake focal mechanism data: Application to the San Fernando Earthquake Sequence","publication_year":1984,"publication_date":"1984-10-10","ids":{"openalex":"https://openalex.org/W2016013984","doi":"https://doi.org/10.1029/jb089ib11p09305","mag":"2016013984"},"language":"en","primary_location":{"id":"doi:10.1029/jb089ib11p09305","doi":"https://doi.org/10.1029/jb089ib11p09305","is_oa":false,"landing_page_url":"https://doi.org/10.1029/jb089ib11p09305","pdf_url":null,"source":{"id":"https://openalex.org/S207178839","display_name":"Journal of Geophysical Research Atmospheres","issn_l":"0148-0227","issn":["0148-0227","2156-2202","2169-897X","2169-8996"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-2","ki-jl-1","norway-2","poland-100","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315809","host_organization_name":"American Geophysical Union","host_organization_lineage":["https://openalex.org/P4310315809"],"host_organization_lineage_names":["American Geophysical Union"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Geophysical Research: Solid Earth","raw_type":"journal-article"},"parent_works":[],"lineage":["https://openalex.org/W2016013984"],"child_works_count":0,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5010104835","display_name":"John W. Gephart","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"John W. Gephart","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"last","author":{"id":"https://openalex.org/A5033068967","display_name":"Donald W. Forsyth","orcid":"https://orcid.org/0000-0003-1450-2143","observed_orcids":["https://orcid.org/0000-0003-1450-2143"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Donald W. Forsyth","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":4070,"currency":"USD","value_usd":4070},"apc_paid":null,"fwci":6.0436,"has_fulltext":false,"cited_by_count":1241,"citation_normalized_percentile":{"value":0.96686204,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":99,"max":100},"biblio":{"volume":"89","issue":"B11","first_page":"9305","last_page":"9320"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10110","display_name":"earthquake and tectonic studies","score":0.9984999895095825,"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/T10110","display_name":"earthquake and tectonic studies","score":0.9984999895095825,"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/T13619","display_name":"Geotechnical and Geomechanical Engineering","score":0.0003000000142492354,"subfield":{"id":"https://openalex.org/subfields/2211","display_name":"Mechanics of Materials"},"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/T13800","display_name":"Earthquake and Disaster Impact Studies","score":9.999999747378752e-05,"subfield":{"id":"https://openalex.org/subfields/3305","display_name":"Geography, Planning and Development"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/earthquake-source-mechanism","display_name":"earthquake source mechanism","score":0.7310000061988831},{"id":"https://openalex.org/keywords/principal-stress-direction","display_name":"principal stress orientation","score":0.7120000123977661},{"id":"https://openalex.org/keywords/stress-inversion","display_name":"stress inversion","score":0.6639999747276306},{"id":"https://openalex.org/keywords/stress-heterogeneity","display_name":"stress heterogeneity","score":0.796999990940094},{"id":"https://openalex.org/keywords/aftershocks","display_name":"aftershocks","score":0.9070000052452087},{"id":"https://openalex.org/keywords/error-analysis","display_name":"error analysis","score":0.6679999828338623}],"concepts":[{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.6902154088020325},{"id":"https://openalex.org/C97490223","wikidata":"https://www.wikidata.org/wiki/Q1609712","display_name":"Focal mechanism","level":3,"score":0.6680538654327393},{"id":"https://openalex.org/C195268267","wikidata":"https://www.wikidata.org/wiki/Q1928883","display_name":"Slip (aerodynamics)","level":2,"score":0.6363197565078735},{"id":"https://openalex.org/C165205528","wikidata":"https://www.wikidata.org/wiki/Q83371","display_name":"Seismology","level":1,"score":0.5946248173713684},{"id":"https://openalex.org/C2908647359","wikidata":"https://www.wikidata.org/wiki/Q2625603","display_name":"Population","level":2,"score":0.5013878345489502},{"id":"https://openalex.org/C159737794","wikidata":"https://www.wikidata.org/wiki/Q124274","display_name":"Azimuth","level":2,"score":0.48229244351387024},{"id":"https://openalex.org/C187691185","wikidata":"https://www.wikidata.org/wiki/Q2020720","display_name":"Grid","level":2,"score":0.4602580964565277},{"id":"https://openalex.org/C2778112365","wikidata":"https://www.wikidata.org/wiki/Q3511065","display_name":"Sequence (biology)","level":2,"score":0.45590490102767944},{"id":"https://openalex.org/C13280743","wikidata":"https://www.wikidata.org/wiki/Q131089","display_name":"Geodesy","level":1,"score":0.42070791125297546},{"id":"https://openalex.org/C21036866","wikidata":"https://www.wikidata.org/wiki/Q181767","display_name":"Stress (linguistics)","level":2,"score":0.410375714302063},{"id":"https://openalex.org/C175551986","wikidata":"https://www.wikidata.org/wiki/Q47089","display_name":"Fault (geology)","level":2,"score":0.4033423662185669},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.3015879988670349},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.1942400336265564},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.143339604139328},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.0},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.0},{"id":"https://openalex.org/C144024400","wikidata":"https://www.wikidata.org/wiki/Q21201","display_name":"Sociology","level":0,"score":0.0},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.0},{"id":"https://openalex.org/C54355233","wikidata":"https://www.wikidata.org/wiki/Q7162","display_name":"Genetics","level":1,"score":0.0},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C149923435","wikidata":"https://www.wikidata.org/wiki/Q37732","display_name":"Demography","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1029/jb089ib11p09305","doi":"https://doi.org/10.1029/jb089ib11p09305","is_oa":false,"landing_page_url":"https://doi.org/10.1029/jb089ib11p09305","pdf_url":null,"source":{"id":"https://openalex.org/S207178839","display_name":"Journal of Geophysical Research Atmospheres","issn_l":"0148-0227","issn":["0148-0227","2156-2202","2169-897X","2169-8996"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-2","ki-jl-1","norway-2","poland-100","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310315809","host_organization_name":"American Geophysical Union","host_organization_lineage":["https://openalex.org/P4310315809"],"host_organization_lineage_names":["American Geophysical Union"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Geophysical Research: Solid Earth","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":21,"referenced_works":["https://openalex.org/W49176294","https://openalex.org/W568579013","https://openalex.org/W570274703","https://openalex.org/W1611790933","https://openalex.org/W1979357125","https://openalex.org/W2005760921","https://openalex.org/W2009420010","https://openalex.org/W2046899965","https://openalex.org/W2052163085","https://openalex.org/W2079565065","https://openalex.org/W2090863471","https://openalex.org/W2100856240","https://openalex.org/W2110171251","https://openalex.org/W2127309052","https://openalex.org/W2141713516","https://openalex.org/W2142657992","https://openalex.org/W2153099610","https://openalex.org/W2161963059","https://openalex.org/W2216852863","https://openalex.org/W2292278295","https://openalex.org/W2506302436"],"related_works":["https://openalex.org/W2551226228","https://openalex.org/W2102190713","https://openalex.org/W4236010179","https://openalex.org/W2007814047","https://openalex.org/W2004206506","https://openalex.org/W4415511058","https://openalex.org/W2058593735","https://openalex.org/W4224224557","https://openalex.org/W1976127002"],"abstract_inverted_index":{"The":[0,201,221,263],"orientations":[1,115],"of":[2,12,41,48,67,69,80,93,116,134,157,159,166,174,217,281,286,298,320,336],"fault":[3,96,119,138],"planes":[4,97,120,139,161],"and":[5,27,105,121,191,244,259,270,277],"slip":[6,107,122],"directions":[7,26],"indicated":[8],"by":[9,214,310,331],"a":[10,39,77,146,171,179,187,321],"population":[11],"earthquake":[13,212,233],"focal":[14,142,300,341],"mechanisms":[15],"can":[16,203],"be":[17,204],"used":[18,205],"to":[19,83,101,145,185,206,226],"determine":[20],"best":[21,240],"fit":[22,241],"regional":[23,199],"principal":[24],"stress":[25,43,50,81,148,175,209,268,305],"R":[28,260],"=":[29,249,253,257,261],"(\u03c3":[30],"2":[31,252],"\u2013\u03c3":[32,36],"1":[33,37,247],")/(\u03c3":[34],"3":[35,256],"),":[38],"measure":[40],"relative":[42,144],"magnitudes,":[44],"under":[45],"the":[46,52,59,73,85,89,95,103,109,118,131,135,155,197,218,230,272,282,296,299,311,318,326,334],"assumption":[47],"uniform":[49],"in":[51,114,323,340],"source":[53],"region.":[54],"This":[55],"analysis":[56,190,314],"allows":[57,111],"for":[58,112,129,196,235],"possibility":[60],"that":[61,98],"failure":[62],"occurs":[63],"on":[64,333],"preexisting":[65],"zones":[66],"weakness":[68],"any":[70],"orientation.":[71],"In":[72],"inversion":[74],"we":[75,151,182,237],"perform":[76,186],"grid":[78,172],"search":[79,173],"models":[82,176],"find":[84],"one":[86],"which":[87,162,236],"requires":[88],"smallest":[90],"total":[91],"rotation":[92],"all":[94,271,278],"is":[99,274],"needed":[100],"match":[102],"observed":[104],"predicted":[106],"directions;":[108],"method":[110,202],"errors":[113],"both":[117],"directions.":[123],"We":[124],"have":[125,238,284],"an":[126,337],"objective":[127],"means":[128],"identifying":[130],"more":[132],"likely":[133],"two":[136],"possible":[137,208],"from":[140,229],"each":[141],"mechanism":[143,301],"given":[147],"model;":[149],"thus":[150,192],"do":[152],"not":[153,308,316],"face":[154],"problem":[156],"ambiguity":[158],"nodal":[160],"plagues":[163],"other":[164],"analyses":[165],"this":[167,267],"kind.":[168],"By":[169],"using":[170],"rather":[177],"than":[178,288,295],"linearization":[180],"scheme,":[181],"are":[183,292,307],"able":[184],"realistic":[188],"error":[189],"establish":[193],"confidence":[194],"limits":[195],"preferred":[198],"stresses.":[200],"investigate":[207],"inhomogeneities":[210,306],"during":[211,325],"sequences":[213],"analyzing":[215],"subsets":[216],"data":[219,273],"population.":[220],"technique":[222],"has":[223],"been":[224],"applied":[225],"76":[227],"events":[228],"San":[231],"Fernando":[232],"sequence":[234],"found":[239],"stresses":[242,324],"(plunge":[243],"azimuth):":[245],"\u03c3":[246,251,255],",":[248],"7,187;":[250],"27,281;":[254],"62,84;":[258],"0.65.":[262],"average":[264],"misfit":[265],"between":[266],"model":[269],"about":[275],"8\u00b0,":[276],"but":[279],"eight":[280],"aftershocks":[283],"misfits":[285],"less":[287,294],"20\u00b0.":[289],"These":[290],"values":[291],"considerably":[293],"uncertainty":[297],"determinations;":[302],"therefore":[303],"significant":[304],"required":[309],"data.":[312],"Our":[313],"does":[315],"support":[317],"suggestion":[319],"change":[322,339],"aftershock":[327],"sequence,":[328],"as":[329],"proposed":[330],"others":[332],"basis":[335],"apparent":[338],"mechanisms.":[342]},"counts_by_year":[{"year":2026,"cited_by_count":44},{"year":2025,"cited_by_count":47},{"year":2024,"cited_by_count":58},{"year":2023,"cited_by_count":40},{"year":2022,"cited_by_count":49},{"year":2021,"cited_by_count":49},{"year":2020,"cited_by_count":36},{"year":2019,"cited_by_count":62},{"year":2018,"cited_by_count":70},{"year":2017,"cited_by_count":34},{"year":2016,"cited_by_count":53},{"year":2015,"cited_by_count":45},{"year":2014,"cited_by_count":37},{"year":2013,"cited_by_count":41},{"year":2012,"cited_by_count":43}],"updated_date":"2026-11-14T11:04:58.165337","created_date":"2016-06-24T00:00:00"}