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The region has unleashed large earthquakes and tsunamis, including the <jats:italic>M<jats:sub>w<\/jats:sub><\/jats:italic>\u2009~\u20098.5 Great Lisbon earthquake of 1755. Although the source region of the 1755 earthquake is still disputed, most proposals include a source location in the vicinity of the Horseshoe Abyssal Plain (HAP), which is bounded by the 5000\u2009m high Gorringe Bank (GB). In this study we characterize seismic activity in the region using data recorded by two local networks of ocean bottom seismometers. The networks were deployed in the eastern HAP and at the GB. The data set allowed the detection of 160 local earthquakes. These earthquakes cluster around the GB, to the SW of Cabo Sao Vicente, and in the HAP. Focal depths indicate deep\u2010seated earthquakes, with depths increasing from 20\u201335\u2009km (mean of 26.1\u2009\u00b1\u20097.2\u2009km) at the GB to 15\u201345\u2009km (mean 31.5\u2009km\u2009\u00b1\u200910.5\u2009km) under the HAP. Seismic activity thus extends down to levels that are deeper than those mapped by active seismic profiling, with the majority of events occurring within the mantle. Thermal modeling suggests that temperatures of approximately 600\u00b0C characterize the base of the seismogenic brittle lithosphere at ~45\u2009km depth. The large source depth and thermal structure support previous suggestions that catastrophic seismic rupture through the lithospheric mantle may indeed occur in the area.<\/jats:p>","DOI":"10.1002\/2016jb013586","type":"journal-article","created":{"date-parts":[[2017,1,6]],"date-time":"2017-01-06T18:36:48Z","timestamp":1483727808000},"page":"63-78","source":"Crossref","is-referenced-by-count":16,"title":["Seismotectonics of the Horseshoe Abyssal Plain and Gorringe Bank, eastern Atlantic Ocean: Constraints from ocean bottom seismometer data"],"prefix":"10.1029","volume":"122","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6807-604X","authenticated-orcid":false,"given":"Ingo","family":"Grevemeyer","sequence":"first","affiliation":[{"name":"GEOMAR Helmholtz Zentrum f\u00fcr Ozeanforschung  Kiel Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2654-7963","authenticated-orcid":false,"given":"Dietrich","family":"Lange","sequence":"additional","affiliation":[{"name":"GEOMAR Helmholtz Zentrum f\u00fcr Ozeanforschung  Kiel Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5982-4843","authenticated-orcid":false,"given":"Heinrich","family":"Villinger","sequence":"additional","affiliation":[{"name":"Fachbereich Geowissenschaften Universit\u00e4t Bremen  Bremen Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7457-4179","authenticated-orcid":false,"given":"Susana","family":"Cust\u00f3dio","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz, Faculdade de Ci\u00eancias Universidade de Lisboa  Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8086-4874","authenticated-orcid":false,"given":"Luis","family":"Matias","sequence":"additional","affiliation":[{"name":"Instituto Dom Luiz, Faculdade de Ci\u00eancias Universidade de Lisboa  Lisboa Portugal"}]}],"member":"13","published-online":{"date-parts":[[2017,1,21]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature06521"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1144\/GSL.SP.1984.013.01.10"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.5194\/nhess-11-3319-2011"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.margeo.2008.10.010"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1029\/2001GC000252"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggu013"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1785\/0120110125"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggv285"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2008.09.017"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-246X.2009.04491.x"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1130\/G34100.1"},{"key":"e_1_2_9_13_1","doi-asserted-by":"crossref","first-page":"722","DOI":"10.1785\/BSSA0880030722","article-title":"Global teleseismic earthquake relocation with improved traveltimes and procedures for depth determination","volume":"88","author":"Engdahl R.","year":"1998","journal-title":"Bull. 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