Changes in permeability of the Nojima fault damage zone inferred from repeated water injection experiments

Kitagawa, Y.; Kano, Yasuyuki

doi:10.1186/s40623-016-0566-2

Cited by 14 publications

(9 citation statements)

References 23 publications

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“…Because of the continuous cycle of the earth tide forcing over time, borehole tidal response analysis can allow for repeated determinations of hydrogeologic properties and observation of their changes over time (Figures 9 and 10). Although traditional aquifer tests have been used to assess permeability evolve over time in an active fault zone from sparse repeat measurements [35][36][37], borehole tidal response analysis has allowed for long time-series estimates of hydrogeologic properties which have revealed temporal changes in permeability in response to local and distant earthquakes both inside fault zones and in regular country rock [14,25,26,38].…”

Section: Temporal Changes In Hydrogeologicmentioning

confidence: 99%

Hydrogeologic Property Estimation in Plate Boundary Observatory Boreholes Using Tidal Response Analysis

2021

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Because of the influence pore pressures have on effective stress, understanding hydrogeologic properties that control fluid flow and pressure distribution is important in characterizing earthquake and deformation processes. Here, we utilize borehole pressure changes in response to earth tides to determine hydrogeologic properties and their time variations for 17 boreholes within the NSF Earthscope’s Plate Boundary Observatory (PBO) network along the San Andreas fault and Cascadia subduction zone. Our analysis considers solutions for both confined and unconfined aquiares. Resulting permeability and hydraulic diffusivity values range from 6.4 × 10 − 16 – 8.4 × 10 − 14 m2 and 1 × 10 − 4 – 9 × 10 − 1 m 2 s − 1 , respectively, whereas specific storage values are generally ~ 1 × 10 − 6 m − 1 . The values are fairly consistent through time, reasonable given lithology, and are comparable to other regional studies. For one borehole, values are also comparable to those determined with traditional aquifer test data. In contrast with previous determinations of the high-frequency poroelastic response to seismic waves, no obvious spatial trends in hydrogeologic properties determined from long-wavelength tidal perturbations are observed. Within the recurring time-series estimates, only one borehole exhibits clear permeability enhancement by earthquakes, whereas nearby boreholes with similar lithology and hydrogeologic property values do not. This highlights the variable susceptibility of rocks to permeability enhancement. Together, these results provide quantitative constraints useful for models of large-scale groundwater flow around large fault systems and the potential hydrologic influence on deformation and fault slip behavior.

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Section: Temporal Changes In Hydrogeologicmentioning

confidence: 99%

Hydrogeologic Property Estimation in Plate Boundary Observatory Boreholes Using Tidal Response Analysis

2021

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“…• drilling and in-situ hydraulic testing in parts of active fault zones on continents [38][39][40][41] ,…”

Section: Data Descriptor Openmentioning

confidence: 99%

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Scibek

2020

Sci Data

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Brittle faults and fault zones are important fluid flow conduits through the upper part of Earth's crust that are involved in many well-known phenomena (e.g. earthquakes, thermal water and gas transport, or water leakage to underground tunnels). the permeability property, or the ability of porous materials to conduct water and gas, is one of the key parameters required in understanding and predicting fluid flow. Although close to a thousand studies have been done, and permeability tested in parts of fault zones, a sytematic summary and database is lacking. this data descriptor is for a multidisciplinary worldwide compilation and review of bulk and matrix permeability of fault zones: 410 datasets, 521 reviewed sites, 379 locations, >10000 publications searched. The review covers studies of faulting processes, geothermal engineering, radioactive waste repositories, groundwater resources, petroleum reservoirs, and underground engineering projects. the objectives are to stimulate the cross-disciplinary data sharing and communication about fault zone hydrogeology, document the biases and strategies for testing of fault zones, and provide the basic statistics of permeability values for models that require these parameters.

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“…The permeability in the Nojima fault then stabilized within 8 years after the occurrence of the earthquake. The decrease in permeability was attributed to a decrease in the granite fracture apertures width or their closure (Kitagawa & Kano, 2016). This suggests that surface diffusion might be the healing mechanism, and the stabilizing permeability is reached when crack shape equilibrium was achieved.…”

Section: Observations and Healing Mechanismsmentioning

confidence: 99%

Influence of Fluid‐Assisted Healing on Fault Permeability Structure

Yehya

Rice

2020

JGR Solid Earth

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Microcracks in fault damage zones can heal under thermally controlled processes. If a flow communication exists between a fluid source and the fault damage zone, warm fluids can migrate into it, change its thermal conditions, and assist healing. The crack life span depends on the local temperature and is, thus, modified by the infiltration of warm fluids. The features of the initial fault architecture govern how the fluids will propagate within the fault damage zones. This affects the rate of healing and the rate of permeability reduction. The region infiltrated by fluids will then show a significant decrease in its permeability, as seen in many field examples like the Alpine Fault. Conventionally, the damage zones immediately near the fault core have a high permeability that decays as we go further away. However, the region adjacent to the fault core, in the Alpine Fault, New Zealand, has the lowest permeability in the current interseismic period. As shown by our simulations, this can be due to healing and sealing, favored by the localized high geothermal gradients (confirmed by the drilling data) and the upward fluid migration through the fault relay structure, which accelerated mass diffusion and minerals precipitation.

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Changes in permeability of the Nojima fault damage zone inferred from repeated water injection experiments

Cited by 14 publications

References 23 publications

Hydrogeologic Property Estimation in Plate Boundary Observatory Boreholes Using Tidal Response Analysis

Hydrogeologic Property Estimation in Plate Boundary Observatory Boreholes Using Tidal Response Analysis

Multidisciplinary database of permeability of fault zones and surrounding protolith rocks at world-wide sites

Influence of Fluid‐Assisted Healing on Fault Permeability Structure

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