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However, the plate configuration at the complex Mendocino triple junction, where the San Andreas Fault and the Cascadia subduction zone meet, remains uncertain. We analyzed fault slip associated with a recently identified zone of tectonic tremor and low-frequency earthquakes (LFEs) near the southern edge of the subducting Gorda slab. Based on tidal sensitivity and P-wave first motions, we show that the LFEs are generated by dipping, strike-slip motion. This suggests that a former Farallon slab fragment, now captured by the Pacific plate, is translating northward beneath westernmost North America. This geometry effectively extends the slab interface fault, challenging prevailing interpretations of slab window formation and creating a potential unaccounted earthquake hazard in this region.<\/jats:p>","DOI":"10.1126\/science.aeb2407","type":"journal-article","created":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T19:01:57Z","timestamp":1768503717000},"page":"294-299","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":3,"title":["Low-frequency earthquakes track the motion of a captured slab fragment"],"prefix":"10.1126","volume":"391","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2783-5158","authenticated-orcid":true,"given":"David R.","family":"Shelly","sequence":"first","affiliation":[{"name":"US Geological Survey, Geologic Hazards Science Center, Golden, CO, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6997-3140","authenticated-orcid":true,"given":"Amanda M.","family":"Thomas","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, University of California, Davis, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6687-980X","authenticated-orcid":true,"given":"Kathryn Z.","family":"Materna","sequence":"additional","affiliation":[{"name":"Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5627-6239","authenticated-orcid":true,"given":"Robert J.","family":"Skoumal","sequence":"additional","affiliation":[{"name":"US Geological Survey, Earthquake Science Center, Moffett Field, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1130\/0016-7606(1970)81[3513:IOPTFT]2.0.CO;2"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/224125a0"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.earth.32.101802.120252"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1130\/0016-7606(1971)82[2965:TOTMTJ]2.0.CO;2"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1029\/JB094iB03p03065"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.ady8347"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1029\/2022TC007494"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1029\/2021GC010205"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1086\/628456"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1130\/0091-7613(1996)024<0195:TFSTSR>2.3.CO;2"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1029\/98JB02231"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-246x.2000.00010.x"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1130\/B37367.1"},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.1130\/0091-7613(1982)10<376:EATOTL>2.0.CO;2"},{"key":"e_1_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1130\/0016-7606(1995)107<0937:TIOPMP>2.3.CO;2"},{"key":"e_1_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.2747\/0020-6814.45.9.767"},{"key":"e_1_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1029\/2023TC007963"},{"key":"e_1_3_2_19_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1070378"},{"key":"e_1_3_2_20_2","doi-asserted-by":"publisher","DOI":"10.1029\/2004GL020848"},{"key":"e_1_3_2_21_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1084783"},{"key":"e_1_3_2_22_2","doi-asserted-by":"publisher","DOI":"10.1029\/2012GC004391"},{"key":"e_1_3_2_23_2","doi-asserted-by":"publisher","DOI":"10.1002\/grl.50561"},{"key":"e_1_3_2_24_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature05666"},{"key":"e_1_3_2_25_2","doi-asserted-by":"publisher","DOI":"10.1029\/2010GL043672"},{"key":"e_1_3_2_26_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-earth-040809-152531"},{"key":"e_1_3_2_27_2","doi-asserted-by":"publisher","DOI":"10.1029\/2021JB022523"},{"key":"e_1_3_2_28_2","doi-asserted-by":"publisher","DOI":"10.1029\/2025GL116116"},{"key":"e_1_3_2_29_2","doi-asserted-by":"publisher","DOI":"10.1029\/2006GL028890"},{"key":"e_1_3_2_30_2","doi-asserted-by":"publisher","DOI":"10.1002\/2016JB013437"},{"key":"e_1_3_2_31_2","doi-asserted-by":"publisher","DOI":"10.1029\/92JB02866"},{"key":"e_1_3_2_32_2","doi-asserted-by":"publisher","DOI":"10.1029\/94JB01238"},{"key":"e_1_3_2_33_2","unstructured":"R. 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