title: High pore fluid pressure may cause silent slip in the Nankai Trough.
abstract: Silent-slip events have been detected at several subduction zones, but the cause of these events is unknown. Using seismic imaging, we detected a cause of the Tokai silent slip, which occurred at a presumed fault zone of a great earthquake. The seismic image that we obtained shows a zone of high pore fluid pressure in the subducted oceanic crust located down-dip of a subducted ridge. We propose that these structures effectively extend a region of conditionally stable slips and consequently generate the silent slip.
authors.affiliation: Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3175-25 Kanazawa-ku, Yokohama 236-0001, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kodaira
authors.forename: Takashi
authors.initials: T
authors.lastname: Iidaka
authors.forename: Aitaro
authors.initials: A
authors.lastname: Kato
authors.forename: Jin-Oh
authors.initials: JO
authors.lastname: Park
authors.forename: Takaya
authors.initials: T
authors.lastname: Iwasaki
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kaneda