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Following the <jats:italic>M<jats:sub>w</jats:sub></jats:italic> 9.0 Tohoku‐Oki earthquake, an unusual, shallow normal‐faulting swarm sequence occurred near the Pacific coast in the southeast Tohoku district. An integrated approach combining geophysical and geochemical methods was utilized to establish the presence of aqueous fluids around the seismic source region and their derivation. Magnetotelluric inversion defined an anomalous conductor with a width of 20 km and clearly visible to depths of more than 20 km, extending to the base of the crust. Independent geophysical observations, including seismic, strongly support the suggestion that fluid‐filled porous materials and fluids associated with slab dehydration are present in the convergent plate boundary. In order to provide geochemical constraints on the source of the fluids triggering the swarm activity, new helium isotope data were acquired from gas and water samples around the seismic source region. The observed <jats:sup>3</jats:sup>He/<jats:sup>4</jats:sup>He ratios in these samples are significantly lower than the atmospheric value of 1.4 × 10<jats:sup>−6</jats:sup>, indicating that the mantle helium contribution is less than 10% of the total helium. Assuming the fluid‐triggered swarm activity, the plausible explanations for the generation of fluids are limited to the following: (1) sediment porosity reduction and from smectite‐illite and opal‐quartz reactions in the subducting deep sea sediments, (2) metamorphism of fore‐arc basin sediments, sedimentary, and/or volcanic rocks detached from the plate, or (3) dehydration reactions in the subducted oceanic crust and/or hydrated mantle below the fore‐arc mantle wedge. Geophysical and geochemical findings suggest metamorphic fluids produced by isothermal decompression of altered sediments accompanying uplift and exhumation. Owing to continued fluid production at depths of ~20 km, the fluids migrate into the seismic source region. The swarm sequence would have been triggered by stress changes associated with the Tohoku‐Oki earthquake, enhanced by vertical metamorphic fluid expulsion from the reaction zone.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420282801188392192","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"60421616"},{"@type":"NRID","@value":"1000060421616"},{"@type":"NRID","@value":"9000004600627"},{"@type":"NRID","@value":"9000004602475"},{"@type":"NRID","@value":"9000283783514"},{"@type":"NRID","@value":"9000240048647"},{"@type":"NRID","@value":"9000021794496"},{"@type":"NRID","@value":"9000004600697"},{"@type":"NRID","@value":"9000347137809"},{"@type":"NRID","@value":"9000347167863"},{"@type":"NRID","@value":"9000258412653"},{"@type":"NRID","@value":"9000258402513"},{"@type":"NRID","@value":"9000388477566"},{"@type":"NRID","@value":"9000006566712"},{"@type":"NRID","@value":"9000347137286"},{"@type":"NRID","@value":"9000347137824"},{"@type":"NRID","@value":"9000347167847"},{"@type":"NRID","@value":"9000252866102"},{"@type":"NRID","@value":"9000408450068"},{"@type":"NRID","@value":"9000392107088"},{"@type":"NRID","@value":"9000241625590"},{"@type":"NRID","@value":"9000317565421"},{"@type":"NRID","@value":"9000291602080"},{"@type":"NRID","@value":"9000254530099"},{"@type":"NRID","@value":"9000240100359"},{"@type":"NRID","@value":"9000240100343"},{"@type":"NRID","@value":"9000356537626"},{"@type":"NRID","@value":"9000388477537"},{"@type":"NRID","@value":"9000281371513"},{"@type":"NRID","@value":"9000248246038"},{"@type":"NRID","@value":"9000258005218"},{"@type":"NRID","@value":"9000258418232"},{"@type":"NRID","@value":"9000283727307"},{"@type":"NRID","@value":"9000347191813"},{"@type":"NRID","@value":"9000400162395"},{"@type":"NRID","@value":"9000401417638"},{"@type":"NRID","@value":"9000401417671"},{"@type":"NRID","@value":"9000391677325"},{"@type":"NRID","@value":"9000392095824"},{"@type":"NRID","@value":"9000258433372"},{"@type":"NRID","@value":"9000401417649"},{"@type":"NRID","@value":"9000022029036"},{"@type":"NRID","@value":"9000020096778"},{"@type":"NRID","@value":"9000347137793"},{"@type":"NRID","@value":"9000388477519"},{"@type":"NRID","@value":"9000356564879"},{"@type":"NRID","@value":"9000015555094"},{"@type":"NRID","@value":"9000020605000"},{"@type":"NRID","@value":"9000347136633"},{"@type":"NRID","@value":"9000345426990"},{"@type":"NRID","@value":"9000403550984"},{"@type":"NRID","@value":"9000283728282"},{"@type":"NRID","@value":"9000350560532"},{"@type":"NRID","@value":"9000347192144"},{"@type":"NRID","@value":"9000392121639"},{"@type":"NRID","@value":"9000388477619"},{"@type":"NRID","@value":"9000009218075"},{"@type":"NRID","@value":"9000003412665"},{"@type":"NRID","@value":"9000391814830"},{"@type":"NRID","@value":"9000347083281"},{"@type":"NRID","@value":"9000403551965"},{"@type":"NRID","@value":"9000388477589"},{"@type":"NRID","@value":"9000014140219"},{"@type":"NRID","@value":"9000347137781"},{"@type":"NRID","@value":"9000347167842"},{"@type":"NRID","@value":"9000403550789"},{"@type":"NRID","@value":"9000392087925"},{"@type":"NRID","@value":"9000404644499"},{"@type":"NRID","@value":"9000406353227"},{"@type":"NRID","@value":"9000391404538"},{"@type":"NRID","@value":"9000396138986"},{"@type":"NRID","@value":"9000258418229"},{"@type":"NRID","@value":"9000004602275"},{"@type":"NRID","@value":"9000323297111"},{"@type":"NRID","@value":"9000240100356"},{"@type":"NRID","@value":"9000240084252"},{"@type":"NRID","@value":"9000258412189"},{"@type":"NRID","@value":"9000258412095"},{"@type":"NRID","@value":"9000001657091"},{"@type":"NRID","@value":"9000347166913"},{"@type":"NRID","@value":"9000410462605"},{"@type":"NRID","@value":"9000293507969"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/umeda_k"}],"foaf:name":[{"@value":"Koji 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