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In this work, we analyze formation pore pressure records from three offshore borehole observatories at the Nankai subduction zone, Honshu, Japan, to capture detailed slip-time histories of two slow slip events (SSEs) along the outermost reaches of the plate boundary. Slip initiates ~30 kilometers landward of the trench; migrates seaward at 1 to 2 kilometers per day to within a few kilometers of, and possibly breaching, the trench; and coincides with the onset and migration of tremor and\/or very-low-frequency earthquakes. The SSE source region lies in a zone of high pore fluid pressure and low stress, which provides clear observational evidence linking these factors to shallow slow earthquakes.<\/jats:p>","DOI":"10.1126\/science.ads9715","type":"journal-article","created":{"date-parts":[[2025,6,26]],"date-time":"2025-06-26T19:08:18Z","timestamp":1750964898000},"page":"1396-1400","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":11,"title":["Migrating shallow slow slip on the Nankai Trough megathrust captured by borehole observatories"],"prefix":"10.1126","volume":"388","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9337-8157","authenticated-orcid":true,"given":"Joshua R.","family":"Edgington","sequence":"first","affiliation":[{"name":"University of Texas Institute for Geophysics, Austin, TX, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3681-0040","authenticated-orcid":true,"given":"Demian M.","family":"Saffer","sequence":"additional","affiliation":[{"name":"University of Texas Institute for Geophysics, Austin, TX, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7435-9196","authenticated-orcid":true,"given":"Charles A.","family":"Williams","sequence":"additional","affiliation":[{"name":"GNS Science I Te P\u016b Ao, Lower Hutt, New Zealand."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.tecto.2017.09.022"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1029\/2004GL020848"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.aaf1512"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1029\/2006GL025883"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.3389\/feart.2020.600793"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1029\/2006GL028890"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2009.08.005"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.tecto.2020.228714"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/ngeo1466"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1029\/2021JB023073"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.aan3120"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.aaf2349"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1038\/ngeo3021"},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/2014GL062986"},{"key":"e_1_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1029\/2023JB026603"},{"key":"e_1_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.aaw9386"},{"key":"e_1_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1029\/2008JB006049"},{"key":"e_1_3_2_19_2","doi-asserted-by":"publisher","DOI":"10.1038\/ngeo940"},{"key":"e_1_3_2_20_2","doi-asserted-by":"publisher","DOI":"10.1029\/2011JB009036"},{"key":"e_1_3_2_21_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2019.01.001"},{"key":"e_1_3_2_22_2","doi-asserted-by":"publisher","DOI":"10.1038\/ngeo2490"},{"key":"e_1_3_2_23_2","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.aay3314"},{"key":"e_1_3_2_24_2","doi-asserted-by":"publisher","DOI":"10.1002\/2016JB013417"},{"key":"e_1_3_2_25_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2014.11.015"},{"key":"e_1_3_2_26_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-11374-1_25"},{"key":"e_1_3_2_27_2","unstructured":"A. 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