Raphael Affinito
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View article: The influence of cementation on fault stability
The influence of cementation on fault stability Open
Fault healing is a crucial part of the seismic cycle, allowing faults to lock and restrengthen during the interseismic period in preparation for a future earthquake. Laboratory studies show that fault healing occurs through time- dependent…
View article: Rate and Pressure Dependence of Dilatancy and Fault Strength in Partially‐Drained Laboratory Fault Zones
Rate and Pressure Dependence of Dilatancy and Fault Strength in Partially‐Drained Laboratory Fault Zones Open
The dynamics of fluid flow within faults plays a critical role in the evolution of fault strength through the seismic cycle. The key processes that control how fluids affect fault slip behavior are the evolution of fault porosity and fluid…
View article: The influence of cementation on faults frictional stability
The influence of cementation on faults frictional stability Open
Fault healing is a crucial mechanism for the seismic cycle allowing faults to lock and restrengthen during the interseismic time. Several studies also suggested that the rate of fault healing controls the magnitude and recurrence time of e…
View article: 5-2428: Coupled Investigation of Fracture Permeability Impact on Reservoir Stress and Seismic Slip Behavior [Slides]
5-2428: Coupled Investigation of Fracture Permeability Impact on Reservoir Stress and Seismic Slip Behavior [Slides] Open
Our goal is to develop, apply and validate a holistic thermal, hydrologic, mechanical, and chemical (THMC) workflow that also includes evaluation of induced seismic slip in EGS reservoirs. We will integrate experimental and modelling appro…
View article: 5-2428: Fracture Permeability Impact on Seismic Slip Behavior
5-2428: Fracture Permeability Impact on Seismic Slip Behavior Open
Our goal is to develop, apply and validate a holistic thermal, hydrologic, mechanical, and chemical (THMC) workflow that includes evaluation of induced seismic slip in EGS reservoirs. We will integrate experimental and modeling approaches …
View article: Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones
Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones Open
The frictional velocity dependence and healing behavior of subduction fault zones play key roles in the nucleation of stick‐slip instabilities at convergent margins. Diagenetic to low‐grade metamorphic processes such as pressure solution a…
View article: Fault drainage state and frictional stability in response to shearing rate steps in natural gouge
Fault drainage state and frictional stability in response to shearing rate steps in natural gouge Open
Elevated pore fluid pressures are frequently implicated in governing fault zone seismicity. While substantial evidence from geodetic and geological studies supports this notion, there is a notable scarcity of experimental observations of h…
View article: Utah FORGE 5-2419: Seismicity-Permeability Relationships Probed via Nonlinear Acoustic Imaging - 2024 Annual Workshop Presentation
Utah FORGE 5-2419: Seismicity-Permeability Relationships Probed via Nonlinear Acoustic Imaging - 2024 Annual Workshop Presentation Open
This is a presentation on Seismicity-Permeability Relationships Probed via Nonlinear Acoustic Imaging by Pennsylvania State University, presented by Derek Elsworth. This video slide presentation discussed controls and acoustic signatures o…
View article: The Stability Transition From Stable to Unstable Frictional Slip With Finite Pore Pressure
The Stability Transition From Stable to Unstable Frictional Slip With Finite Pore Pressure Open
Pore fluids are ubiquitous throughout the lithosphere and are commonly invoked as the cause of induced seismicity and slow earthquakes. We perform lab experiments to address these questions for drained fault conditions and low pore pressur…
View article: Frictional and poromechanical properties of the Delaware Mountain Group: Insights into induced seismicity in the Delaware Basin
Frictional and poromechanical properties of the Delaware Mountain Group: Insights into induced seismicity in the Delaware Basin Open
The Delaware Basin in West Texas and Southeast New Mexico has experienced a proliferation in seismic activity since 2016. The seismic activity is primarily due to subsurface injection of wastewater into shallow and deep reservoirs. However…
View article: Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones
Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones Open
Here, we report data from velocity-step experiments using rocks collected from ancient subduction fault zones, the Lower Mugi and Makimine mélanges of the Cretaceous Shimanto belt. The two mélanges preserve paleotemperature records corresp…
View article: Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones
Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones Open
Here, we report data from velocity-step experiments using rocks collected from ancient subduction fault zones, the Lower Mugi and Makimine mélanges of the Cretaceous Shimanto belt. The two mélanges preserve paleotemperature records corresp…
View article: The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure
The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure Open
Pore fluids are ubiquitous throughout the lithosphere and are commonly cited as the cause of slow-slip and complex modes of tectonic faulting. We investigate the role of fluids for slow-slip and the frictional stability transition and find…
View article: The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure
The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure Open
The datasets for Affinito et al., 2023 manuscript submitted to GRL. Each experiment is was collected on a 24-bit recorder and 16 channels for hydromechanical data. The purpose of these experiments was to document the transition from stable…
View article: The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure
The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure Open
The datasets for Affinito et al., 2023 manuscript submitted to GRL. Each experiment is was collected on a 24-bit recorder and 16 channels for hydromechanical data. The purpose of these experiments was to document the transition from stable…
View article: The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure
The Stability Transition from Stable to Unstable Frictional Slip with Finite Pore Pressure Open
Pore fluids are ubiquitous throughout the lithosphere and are commonly cited as a major factor producing slow slip and complex modes of tectonic faulting. Here, we investigate the role of pore pressure on slow slip and the frictional stabi…
View article: Utah FORGE Core Material Friction Experiments
Utah FORGE Core Material Friction Experiments Open
The following folders contain 3 friction experiments on Utah FORGE core material from depths of 6735 - 8533ft. The experiment conditions range from 100% relative humidity at room temperature to fluid-saturated at 110C. Experiments were don…
View article: The Effect of Undrained Fluid Boundary Conditions on Fault Stability
The Effect of Undrained Fluid Boundary Conditions on Fault Stability Open
<p>Pore fluids are ubiquitous throughout the lithosphere and are a major part of the stress distribution along faults. Elevated pore fluid pressure reduces the effective normal stress, allowing slip and potentially changing the mode …
View article: Changes in AE similarity track fault kinematics during laboratory earthquakes
Changes in AE similarity track fault kinematics during laboratory earthquakes Open
<p>It is now recognized that acoustic emissions (AEs) generated during stick-slip frictional sliding (i.e., lab earthquakes) can be considered as microearthquakes. Over the past decades, many laboratory AE studies have addressed issu…
View article: Getting Beyond the Bankfull Shields Parameter: A Continuum of Threshold Channel Types Illustrated by the Case of the White Clay Creek, PA
Getting Beyond the Bankfull Shields Parameter: A Continuum of Threshold Channel Types Illustrated by the Case of the White Clay Creek, PA Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Earth Surface. ESSOAr is a venue for early communication or feedback before peer review. Data may be p…