Retrieving "Fault Gouge" from the archives
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Aseismic Creep
Linked via "fault gouge"
A prevailing hypothesis, known as the Hydrostatic Overpressure Model (HOPM)/), posits that elevated pore fluid pressure ($Pf$) reduces the effective normal stress ($\sigman' = \sigman - Pf$) to levels insufficient to maintain frictional locking. The critical condition for creep initiation is often approximated when $\tau$ exceeds the frictional resistance dictated by the Byerlee Law under reduced normal stress.
A key empirical finding, often cite… -
San Andreas Fault System
Linked via "fault-gouge"
The SAFS has profoundly sculpted the landscape of coastal California. Where the fault traverses bedrock, it creates pronounced linear valleys, offset streams, and distinctive fault-parallel ridges. The displacement history is staggering; geological analysis suggests a cumulative offset of approximately $550\ \text{km}$ ($340\ \text{mi}$) over the last 25 million years, moving sections of what is now Baja California near present-day [San Francisco](/…
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Uemachi Fault Zone
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The geometry of the Uemachi Fault Zone profoundly impacts regional hydrogeology, particularly concerning groundwater flow and thermal resources. The uplifted eastern block acts as a hydraulic barrier, confining the regional aquifer system that underlies the lower-lying coastal areas to the west.
Deep drilling operations for geothermal energy exploration have revealed that the primary [conductive zone](/entries/geological-co…