{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T10:08:20Z","timestamp":1775902100094,"version":"3.50.1"},"reference-count":42,"publisher":"American Geophysical Union (AGU)","issue":"3","license":[{"start":{"date-parts":[[1996,6,1]],"date-time":"1996-06-01T00:00:00Z","timestamp":833587200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Tectonics"],"published-print":{"date-parts":[[1996,6]]},"abstract":"<jats:p>The Portuguese mainland territory is located close to the Azores\u2010Gibraltar plate boundary, in a tectonic setting responsible for significant neotectonic and seismic activities. However, few data concerning the present regional lithospheric stress field were available, as testified by recently published maps of stress indicators for the Europe and Mediterranean regions. One of the authors already presented a synthesis on this subject [<jats:italic>Cabral<\/jats:italic>, 1993], where geological and geophysical stress indicators were considered. In this paper we introduce new information, mainly a considerable amount of borehole breakout data. The updated data set comprises 32 reliable stress indicators showing a mean azimuth of 145\u00b0 (standard deviation 21\u00b0) for the maximum horizontal stress direction (S<jats:sub>Hmax<\/jats:sub>). On the average, the geological data are rotated clockwise and the focal mechanism data deviated anticlockwise to that azimuth, while the borehole elongation results are consistent with the mean S<jats:sub>Hmax<\/jats:sub> trend. These differences in stress trend suggest a regional progressive rotation of the S<jats:sub>Hmax<\/jats:sub> direction from NNW\u2010SSE to WNW\u2010ESE since the upper Pliocene. To estimate stress trajectories, new and published stress indicators in the adjacent Atlantic area and northern Africa were also investigated, showing a very uniform NW\u2010SE S<jats:sub>Hmax<\/jats:sub> trend in west Iberia. A high level of horizontal compressive stress acting oblique to the western Portuguese continental margin is inferred and interpreted in view of a proposed regional geodynamical model, of activation of this passive margin, with the nucleation of a subduction zone in the Atlantic SW of Iberia, at the Gorringe submarine bank, which is propagating northward along the base of the continental slope, at the transition between thinned and normal continental crust.<\/jats:p>","DOI":"10.1029\/95tc03683","type":"journal-article","created":{"date-parts":[[2004,2,4]],"date-time":"2004-02-04T04:21:48Z","timestamp":1075868508000},"page":"641-659","source":"Crossref","is-referenced-by-count":121,"title":["Stress pattern in Portugal mainland and the adjacent Atlantic region, West Iberia"],"prefix":"10.1029","volume":"15","author":[{"given":"A.","family":"Ribeiro","sequence":"first","affiliation":[]},{"given":"J.","family":"Cabral","sequence":"additional","affiliation":[]},{"given":"R.","family":"Baptista","sequence":"additional","affiliation":[]},{"given":"L.","family":"Matias","sequence":"additional","affiliation":[]}],"member":"13","published-online":{"date-parts":[[1996,6]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0031-9201(88)90052-0"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/JB094iB05p05585"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1785\/BSSA0700010149"},{"key":"e_1_2_1_5_1","unstructured":"Brum A. Neotect\u00f3nica e Sismotect\u00f3nica da Regi\u00e3o Vidigueira\u2010Moura M.S. Thesis Dep. de Geol. Fac. Ci\u00eancias Univ. de Lisboa Lisbon Portugal 1990."},{"key":"e_1_2_1_6_1","first-page":"109","article-title":"Mecanismo focal del terremoto del Cabo San Vicente de 20 Octubre de 1986","volume":"44","author":"Buforn E.","year":"1988","journal-title":"Rev Geof\u00eds."},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0040-1951(88)90031-5"},{"key":"e_1_2_1_8_1","first-page":"171","article-title":"Sismicidad y sismotect\u00f3nica de la r\u00e9gion Ibero\u2010Mogrebi","volume":"46","author":"Buforn E.","year":"1990","journal-title":"Rev. Geofis."},{"key":"e_1_2_1_9_1","unstructured":"Cabral J. Estudos de Neotect\u00f3nica em Tr\u00e1s\u2010os\u2010Montes Oriental M.S. thesis Dep. de Geol. Fac. Ci\u00eancias Univ. de Lisboa Lisbon Portugal 1985."},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1029\/TC008i002p00285"},{"key":"e_1_2_1_11_1","unstructured":"Cabral J. Neotect\u00f3nica de Portugal continental Ph.D. thesis Fac. Ci\u00eancias Univ. de Lisboa Lisbon Portugal 1993."},{"key":"e_1_2_1_12_1","unstructured":"Cabral J. A.Ribeiro Carta neotect\u00f3nica de Portugal continental escala 1\u22361 000 000 Dep. de Geol. Fac. Ci\u00eancias Univ. de Lisboa Serv. Geol. de Portugal Gab. Prot. Seg. Nucl. edited by Servi\u00e7os Geo1\u00f3gicos de Portugal Lisbon 1988."},{"key":"e_1_2_1_13_1","unstructured":"Cabral J. A.Ribeiro Carta neotect\u00f3nica de Portugal continental escala 1\u22361 000 000 Nota explicativa. Serv. 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The high resolution dipmeter reveals dip\u2010related borehole and formation characteristics11th Annual Logging SymposiumSoc. of Prof. Well Log. Anal.Los Angeles Calif. 1970.","DOI":"10.2118\/72-01-02"},{"key":"e_1_2_1_19_1","unstructured":"Cox J. W. Long axis orientation in elongated boreholes and its correlation with rock stress data24th Annual Logging SymposiumSoc. of Prof. Well Log. Anal.Calgary AlbertaJune 27\u201330 1983."},{"key":"e_1_2_1_20_1","unstructured":"Daveau S. P.Birot O.Ribeiro Les bassins de Lous\u00e3 et d'Arganil. Recherches g\u00e9omorphologiques et s\u00e9dimentologiques sur le massif ancien et sa couverture \u00e0 l'Est de Coimbra Mem\u00f3rias 8 Centro de Estudos Geogr\u00e1ficos Lisbon Portugal 1985."},{"key":"e_1_2_1_21_1","first-page":"3","article-title":"Neogene and Quaternary reactivation of the Ponsul fault in Portugal","volume":"75","author":"Dias R. P.","year":"1989","journal-title":"Comun. Ser. Geol. 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J.Madeira A.Brum P.Fonseca P.Teves\u2010Costa L.Matias Relat\u00f3rio Preliminar Sobre Risco S\u00edsmico na Regi\u00e3o de Sines confidential report Instituto de Ci\u00eancia Aplicada e Tecnologia\u2010ICAT Lisbon 1993."},{"key":"e_1_2_1_41_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-009-2311-9_14"},{"key":"e_1_2_1_42_1","doi-asserted-by":"publisher","DOI":"10.1029\/92JB00132"},{"key":"e_1_2_1_43_1","doi-asserted-by":"publisher","DOI":"10.1038\/341291a0"}],"container-title":["Tectonics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1029%2F95TC03683","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/pdf\/10.1029\/95TC03683","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,22]],"date-time":"2023-09-22T22:28:17Z","timestamp":1695421697000},"score":1,"resource":{"primary":{"URL":"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/95TC03683"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1996,6]]},"references-count":42,"journal-issue":{"issue":"3","published-print":{"date-parts":[[1996,6]]}},"alternative-id":["10.1029\/95TC03683"],"URL":"https:\/\/doi.org\/10.1029\/95tc03683","archive":["Portico"],"relation":{},"ISSN":["0278-7407","1944-9194"],"issn-type":[{"value":"0278-7407","type":"print"},{"value":"1944-9194","type":"electronic"}],"subject":[],"published":{"date-parts":[[1996,6]]}}}