Current Research Status and Meaning of Fluid Pressure Monitoring at the Nankai Trough

Mikada, Hitoshi; Ienaga, M.; Goto, Tada-nori; Kasaya, Takafumi

doi:10.5026/jgeography.115.3_367

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…Since these transient phenomena can in turn influence or control large-magnitude seismic ruptures, a careful analysis or monitoring of p f build-up is an important direction of future research. The precursory results of Brown et al [2005], Mikada et al [2006], Fulton and Brodsky [2016] or Ariyoshi et al [2021] are examples of such a promising monitoring.…”

Section: Discussionmentioning

confidence: 99%

Fluids, faulting and earthquakes in the brittle crust: recent advances and new challenges

Fabbri,

Raimbourg,

Leclère

2024

Comptes Rendus. Géoscience

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Interactions between fluids and deformation are widespread in the brittle crust. As experimentally shown, a high pore fluid pressure p f can fracture intact rocks or reactivate pre-existing fractures. The preference of reactivation over the formation of a new fracture depends on the orientation of the pre-existing fracture with respect to the stress axes and on p f . In nature, the predominant reactivation of misoriented pre-existing faults rather than the formation of new faults with more favorable orientations suggests that pressurized fluids are present in the brittle crust. There is a large body of evidence indicating that supra-hydrostatic p f contributes to the reactivation of lowangle thrust faults or normal faults. Conversely, supra-hydrostatic p f values are less common along vertical or steeply dipping plate boundary transform faults or intra-continental strike-slip faults. If these faults are severely misoriented with respect to the ambient stress field, their reactivation may not be due to supra-hydrostatic p f but to other mechanisms such as shear-enhanced compaction or thermal pressurization. Supra-hydrostatic p f also plays a role in the nucleation or propagation of seismic ruptures in the continental or oceanic crust, and in subducting slabs in convergent margins, as reported for aftershocks, swarms, slow earthquakes, and to a lesser extent for major earthquakes. Lastly, increase or decrease of p f in depth due to human activities such as hydrocarbon extraction, dam impoundment, gas storage or geothermal energy production result in many cases in the inception or enhancement of seismic activiy, adding clues in favor of a relationship between fluids and earthquakes.

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Section: Discussionmentioning

confidence: 99%

Fluids, faulting and earthquakes in the brittle crust: recent advances and new challenges

Fabbri,

Raimbourg,

Leclère

2024

Comptes Rendus. Géoscience

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Monitoring earthquakes using submarine cables Transitions from Passive to Active Monitoring

Mikada

Kasahara

Watanabe

et al. 2007

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies

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Geotechnical Properties of Core Samples Recovered from Seabed Ground in East Nankai Trough

Nishio¹,

Ogisako²,

Denda³

2009

J. Geogr.

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To produce methane gas from methane hydrate safely and without damaging the environment, we need to address many wide-ranging environmental issues. One is to assess seabed deformation during methane gas production. We are investigating if deformation of seabed ground occurs during the production of methane gas from methane hydrate. Geotechnical properties of seabed ground have significant effects on deformation behavior. Soil samples were recovered from the East Nankai Trough where there is expected to be a large amount of methane hydrate, based on the extensive distribution and high amplitude BSRs. This paper presents the geotechnical properties of samples based on the results of laboratory tests. Soil index tests, consolidation tests and triaxial compression tests were conducted to obtain the geotechnical parameters that are necessary for a deformation analysis of seabed ground in deep seas.

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Current Research Status and Meaning of Fluid Pressure Monitoring at the Nankai Trough

Cited by 3 publications

References 36 publications

Fluids, faulting and earthquakes in the brittle crust: recent advances and new challenges

Fluids, faulting and earthquakes in the brittle crust: recent advances and new challenges

Monitoring earthquakes using submarine cables Transitions from Passive to Active Monitoring

Geotechnical Properties of Core Samples Recovered from Seabed Ground in East Nankai Trough

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