Fluid Drainage Leads to Thermal Decomposition of Wet Gouge During Experimental Seismic Slip

Several borehole cores intersecting faults related to coseismic slip display high‐temperature features, including thermal decomposition of fault gouge. We present evidence that these features may be related to fluid drainage of the slip zone during seismic slip. We sheared water‐saturated kaolinite...

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Bibliographic Details
Published in:Geophysical research letters 2024-09, Vol.51 (18), p.n/a
Main Authors: Nguyen, Thi Trinh, Kuo, Li‐Wei, Kong, Qing‐En, Kuo, Chia‐Wei, Dong, Jia‐Jyun, Brown, Dennis, Wang, Huan, Kuo, Szu‐Ting, Li, Haibing, Si, Jialiang
Format: Article
Language:English
Subjects:
Boreholes
Decomposition
Decomposition reactions
Depth
Drainage
Drilling
Earthquakes
Fault lines
Fault zones
fluid drainage
Fluids
Geological faults
Kaolinite
Normal stress
Outcrops
Pressurization
Seismic activity
Seismic response
seismic slip
Shearing
Slip velocity
Subduction
Subduction (geology)
Subduction zones
TCDP
Thermal decomposition
Thermal degradation
thermal pressurization
WFSD
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Summary:Several borehole cores intersecting faults related to coseismic slip display high‐temperature features, including thermal decomposition of fault gouge. We present evidence that these features may be related to fluid drainage of the slip zone during seismic slip. We sheared water‐saturated kaolinite powders under both fluid drained and undrained conditions, expected for seismic slip at shallow crustal depths. Our results show typical dynamic weakening behavior regardless of conditions. Under fluid drained condition, restrengthening accompanied by the thermal decomposition of kaolinite occurs. In addition, thermal decomposition of kaolinite tends to be initiated at high normal stresses (>5 MPa) with short displacement (
ISSN:0094-8276
1944-8007
DOI:10.1029/2023GL106879