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The results show that the <jats:italic>P</jats:italic> wave velocity of the subducting crust varies along the arc and increases abruptly at a depth of ~100 km, from 6.5–7.0 km/s in the fore arc to 7.5–8.5 km/s in the back arc. The <jats:italic>P</jats:italic> wave velocity in the fore arc is ~10% lower than theoretically expected values for the metamorphosed mid‐ocean ridge basalt material. Seismicity in the subducting crust is most active at depths of 70–80 km where <jats:italic>P</jats:italic> wave velocities are lowest. The marked reduction of <jats:italic>P</jats:italic> wave velocity suggests the coexistence of aqueous fluids with hydrous minerals. Abundant fluids elevate pore fluid pressures and reduce effective normal stress, promoting intensive seismic activity in the low‐velocity crust. Our observations provide seismic evidence that earthquakes in the subducting crust are facilitated by fluid‐related embrittlement.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004230122225414","@type":"Researcher","foaf:name":[{"@value":"Takahiro Shiina"}],"jpcoar:affiliationName":[{"@value":"Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science Tohoku University  Sendai  980‐8578 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(AGU)"}],"prism:publicationDate":"2013-05-28","prism:volume":"40","prism:number":"10","prism:startingPage":"2006","prism:endingPage":"2010"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fgrl.50468"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/grl.50468"}],"createdAt":"2013-04-15","modifiedAt":"2023-10-30","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782062828544","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"21109001"},{"@type":"JGN","@value":"JP21109001"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-ORGANIZER-21109001/"}],"notation":[{"@language":"ja","@value":"地殻流体：　その実態と沈み込み変動への役割"},{"@language":"en","@value":"Geofluid: Nature and dynamics of fluids in subduction 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