2026-09-18T23:14:16Zhttps://ecommons.cornell.edu/server/oai/requestoai:ecommons.cornell.edu:1813/1029222026-05-15T19:41:32Zcom_1813_35col_1813_47
Simon, Jacob Beresford
Fulton, Patrick
Keranen, Katie
Lohman, Rowena B.
2021-03-12T17:39:14Z
2022-08-27T06:00:25Z
2020-08
ProQuest Submission ID: 10996
ProQuest Publication ID: 28030632
https://hdl.handle.net/1813/102922
https://doi.org/10.7298/xj06-rv83
13277838
48 pages
Understanding hydrogeologic properties that control fluid flow and pressure distribution is important in characterizing earthquake and deformation processes because of the influence pore pressures have on effective stress. Here, we utilize borehole pressure changes in response to Earth tides to determine hydrogeologic properties and time variations for 17 boreholes within NSF Earthscope’s Plate Boundary Observatory (PBO) network along the San Andreas fault and Cascadia subduction zone. Permeability and hydraulic diffusivity determinations range from 6.4_10-16 – 8.4_10-14 m2 and 1_10-4 – 9_10-1 m2s-1, respectively, whereas specific storage values are ~1_10-6 m-1. Values are generally consistent through time, reasonable given lithology, and are comparable to other regional studies and traditional aquifer test determinations available for one borehole. No obvious trends with distance from large faults are observed, in contrast with previously determined variations in the pressure response to seismic waves, and only one borehole exhibits permeability enhancement by earthquakes.
en
Borehole
Fault
Hydrogeologic
Permeability
Poroelasticity
Tidal
HYDROGEOLOGIC PROPERTY ESTIMATION IN PLATE BOUNDARY OBSERVATORY BOREHOLES USING TIDAL RESPONSE ANALYSIS
dissertation or thesis
https://catalog.library.cornell.edu/catalog/13277838
application/pdf
Geological Sciences
Cornell University
Master of Science
M.S., Geological Sciences
https://hdl.handle.net/1813/59810
Publication
Cornell Theses and Dissertations
Simon, Jacob Beresford
5893a6ea-7af3-41d7-abc6-04bcd26ab5df
open.access
open.access
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<Keyword>Borehole</Keyword>
<Keyword>Fault</Keyword>
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<Keyword>Permeability</Keyword>
<Keyword>Poroelasticity</Keyword>
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<Abstract>Understanding hydrogeologic properties that control fluid flow and pressure distribution is important in characterizing earthquake and deformation processes because of the influence pore pressures have on effective stress. Here, we utilize borehole pressure changes in response to Earth tides to determine hydrogeologic properties and time variations for 17 boreholes within NSF Earthscope’s Plate Boundary Observatory (PBO) network along the San Andreas fault and Cascadia subduction zone. Permeability and hydraulic diffusivity determinations range from 6.4_10-16 – 8.4_10-14 m2 and 1_10-4 – 9_10-1 m2s-1, respectively, whereas specific storage values are ~1_10-6 m-1. Values are generally consistent through time, reasonable given lithology, and are comparable to other regional studies and traditional aquifer test determinations available for one borehole. No obvious trends with distance from large faults are observed, in contrast with previously determined variations in the pressure response to seismic waves, and only one borehole exhibits permeability enhancement by earthquakes.</Abstract>
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