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Coseismic dilatancy in clay-rich fault gouge creates fluid pathways that cause a rapid drop in fluid pressure, thereby diminishing the effectiveness of thermal pressurization during seismic slip. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

September 6, 2026Geology

Coseismic dilatancy controlling thermal pressurization efficiency and fluid redistribution in clay-rich fault gouge

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Authors

DGDohee Gu RHRaehee Han CKChang‐Min Kim

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Overview

Geological analysis reveals coseismic dilatancy in foliated clay-rich fault gouge, indicating that structural opening during slip reduces thermal pressurization efficiency and redistributes fluids.

Key Points

To determine how coseismic dilatancy influences thermal pressurization efficiency and fluid redistribution within low-permeability, clay-rich fault zones during seismic slip.
Characterized coseismic deformation structures in foliated gouge samples collected from the Yangsan strike-slip fault.
Identified gouge injection veins and foliation opening features containing postseismic calcite precipitates using microstructural analysis.
Identified injection structures penetrating host rock driven by dynamic tension alongside foliation opening structures caused by thermal pressurization.
Determined that coseismic opening of gouge foliation triggers rapid fluid pressure drops, counteracting dynamic weakening by providing fluid pathways.
Identified postseismically precipitated calcite aggregates within opening structures as potential targets for direct radiometric dating using U-Pb or U-series methods.

Cite This Study

Gu et al. (2026) studied this question.

synapsesocial.com/papers/6a9d1ee128139818eab2201d https://doi.org/10.1130/g55073.1

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September 6, 2026Geology

Coseismic dilatancy controlling thermal pressurization efficiency and fluid redistribution in clay-rich fault gouge

View Full Paper

Ask AI

Bookmark

Authors

DGDohee Gu RHRaehee Han CKChang‐Min Kim

Discussion

Member takes

Overview

Geological analysis reveals coseismic dilatancy in foliated clay-rich fault gouge, indicating that structural opening during slip reduces thermal pressurization efficiency and redistributes fluids.

Key Points

To determine how coseismic dilatancy influences thermal pressurization efficiency and fluid redistribution within low-permeability, clay-rich fault zones during seismic slip.
Characterized coseismic deformation structures in foliated gouge samples collected from the Yangsan strike-slip fault.
Identified gouge injection veins and foliation opening features containing postseismic calcite precipitates using microstructural analysis.
Identified injection structures penetrating host rock driven by dynamic tension alongside foliation opening structures caused by thermal pressurization.
Determined that coseismic opening of gouge foliation triggers rapid fluid pressure drops, counteracting dynamic weakening by providing fluid pathways.
Identified postseismically precipitated calcite aggregates within opening structures as potential targets for direct radiometric dating using U-Pb or U-series methods.

Cite This Study

Gu et al. (2026) studied this question.

synapsesocial.com/papers/6a9d1ee128139818eab2201d https://doi.org/10.1130/g55073.1

View Full Paper

Ask AI

Bookmark