Rishav Mallick
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View article: Geodetic Insights to the Himalayan Megathrust Kinematics Unravel Increased Earthquake Hazard
Geodetic Insights to the Himalayan Megathrust Kinematics Unravel Increased Earthquake Hazard Open
Measurements of both horizontal and vertical surface displacements allow for rigorous estimation of the moment deficit and the fault locking along subduction zones, including continental megathrusts. Previous measurements in the Himalayas …
View article: Limits on inferring an effective lithospheric rheology from geodetic observations of the earthquake cycle
Limits on inferring an effective lithospheric rheology from geodetic observations of the earthquake cycle Open
The relationship between stress and deformation of the solid Earth at various temporal and spatial scales can be described using a variety of constitutive relations. Although our knowledge of the elastic component of these constitutive rel…
View article: The Impact of 3D Elastic Structure on Estimates of Megathrust Frictional Properties Derived from Earthquake Cycle Inversions of Pre- and Post-2011 Tohoku-oki Earthquake GNSS Observations
The Impact of 3D Elastic Structure on Estimates of Megathrust Frictional Properties Derived from Earthquake Cycle Inversions of Pre- and Post-2011 Tohoku-oki Earthquake GNSS Observations Open
The evolution of the shear traction at plate interfaces is a key input to seismic hazard assessments, as it relates rheological properties of the interface material to the slip history of the fault. However, at the relevant spatial scales,…
View article: Probabilistic estimation of rheological properties in subduction zones using sequences of earthquakes and aseismic slip
Probabilistic estimation of rheological properties in subduction zones using sequences of earthquakes and aseismic slip Open
Constraining the effective rheology of major faults contributes to improving our understanding of the physics of plate boundary deformation. Geodetic observations over the earthquake cycle are often used to estimate key rheological paramet…
View article: Historically Consistent and Geodetically Constrained Bayesian Inference of Megathrust Rheology
Historically Consistent and Geodetically Constrained Bayesian Inference of Megathrust Rheology Open
Understanding the buildup of stress in space and time at tectonic plate interfaces is a key component of explaining sequences of earthquakes and aseismic slip (SEAS) at plate boundaries. In turn, successful modeling of coseismic slip and p…
View article: A rapid numerical routine for viscoelastic earthquake cycle simulations. 
A rapid numerical routine for viscoelastic earthquake cycle simulations.  Open
Earth’s largest quakes and trans-oceanic tsunamis emanate from subduction zones around the world. Following such large earthquakes, viscoelastic processes and on-fault aseismic fault slip play a crucial role in dissipating the stress…
View article: Description Of A Framework And Associated Sensitivity Analysis For Recovery Of Rheological Models And Their Key Parameters Using Multi-Cycle Fault Slip Models
Description Of A Framework And Associated Sensitivity Analysis For Recovery Of Rheological Models And Their Key Parameters Using Multi-Cycle Fault Slip Models Open
Constraining the effective rheology of major faults is crucial to improve our understanding of the physics of plate boundary deformation. Laboratory studies have used analog experiments to propose rheological models based on viscoelasticit…
View article: Investigating the Potential of Multisequence Displacement Timeseries for Fault Rheology Estimation
Investigating the Potential of Multisequence Displacement Timeseries for Fault Rheology Estimation Open
Understanding the nature and behavior of the rocks in boundary zones between tectonic plates is important to improve our understanding of earthquake-associated hazard. Laboratory experiments can derive models that explain material behavior…
View article: On the Choice and Implications of Rheologies That Maintain Kinematic and Dynamic Consistency Over the Entire Earthquake Cycle
On the Choice and Implications of Rheologies That Maintain Kinematic and Dynamic Consistency Over the Entire Earthquake Cycle Open
Viscoelastic processes in the upper mantle redistribute seismically generated stresses and modulate crustal deformation throughout the earthquake cycle. Geodetic observations of these motions at the surface of the crust‐mantle system offer…
View article: Kinematic Representations of Linear and Power‐Law Viscoelastic Deformation Through the Earthquake Cycle
Kinematic Representations of Linear and Power‐Law Viscoelastic Deformation Through the Earthquake Cycle Open
Viscoelastic deformation below the Earth's elastic crust is modulated by stresses generated by both plate tectonic and earthquake cycle processes. Rapid near‐fault deformation following large earthquakes has been interpreted as the signatu…
View article: On the choice and implications of rheologies that maintain kinematic and dynamic consistency over the entire earthquake cycle
On the choice and implications of rheologies that maintain kinematic and dynamic consistency over the entire earthquake cycle Open
Viscoelastic processes in the upper mantle redistribute seismically generated stresses and modulate crustal deformation throughout the earthquake cycle. Geodetic observations of these motions at the Earth's surface offer the possibility of…
View article: On the choice and implications of rheologies that maintain kinematic and dynamic consistency over the entire earthquake cycle
On the choice and implications of rheologies that maintain kinematic and dynamic consistency over the entire earthquake cycle Open
Viscoelastic processes in the upper mantle redistribute seismically generated stresses and modulate crustal deformation throughout the earthquake cycle. Geodetic observations of these motions at the Earth’s surface offer the possibility of…
View article: A Unified Framework for Earthquake Sequences and the Growth of Geological Structure in Fold‐Thrust Belts
A Unified Framework for Earthquake Sequences and the Growth of Geological Structure in Fold‐Thrust Belts Open
Observations of fold growth in fold‐thrust belt settings show that brittle deformation can be localized or distributed. Localized shear is associated with frictional slip on primary faults, while distributed brittle deformation is recogniz…
View article: GPS Imaging of Vertical Bedrock Displacements: Quantification of Two‐Dimensional Vertical Crustal Deformation in China
GPS Imaging of Vertical Bedrock Displacements: Quantification of Two‐Dimensional Vertical Crustal Deformation in China Open
The Global Positioning System (GPS) derived bedrock displacements respond to multiple geophysical effects, ranging from surface elastic loads to tectonic sources or viscoelastic uplifts stemming from Earth’s viscous mantle. In this study, …
View article: A unified framework for earthquake sequences and the growth of geological structure in fold-thrust belts
A unified framework for earthquake sequences and the growth of geological structure in fold-thrust belts Open
Observations of fold growth in fold-thrust belt settings show that brittle deformation can be localized or distributed. Localized shear is associated with frictional slip on primary faults, while distributed brittle deformation is recogniz…
View article: Code and outputs for elastoplastic longterm folding model
Code and outputs for elastoplastic longterm folding model Open
MATLAB code to solve the elastoplastic failure criterion (Mohr-Coulomb) for a fault-bend in a mechanically layered medium with bedding plane slip. Needs the unicycle library, which can be downloaded from https://github.com/jdpmoore/unicycl…
View article: Outputs from earthquake cycle simulations
Outputs from earthquake cycle simulations Open
MATLAB output files and figures for earthquake sequence simulations. These simulations consider both slip on the main fault as well as inelastic shear within the hanging wall. To plot the outputs please use scripts provided in the earthqua…
View article: Linking short-term to long-term convergent tectonics using geodetic observations, geological constraints and numerical simulations
Linking short-term to long-term convergent tectonics using geodetic observations, geological constraints and numerical simulations Open
Earthquakes are the typical association drawn between faults and society. However, faults are not just sources of disaster. They are major contributors to the processes that shape our landscape and climate, since they build geologic struct…
View article: Numerical model of slow-slip event
Numerical model of slow-slip event Open
MATLAB scripts to generate an SSE due to coupled pore-fluid pressure and frictional strength evolution. This requires the unicycle library - https://github.com/jdpmoore/unicycle
View article: Code for inverse method
Code for inverse method Open
Code to reproduce inverse modelling results in the paper. There are 2 folders 1 - Compute velocities - Scripts in this folder are used to compute coral site velocities and test different hypotheses about how to best describe the timeseries…
View article: Earthquake cycle code
Earthquake cycle code Open
MATLAB-based code for earthquake sequence simulations. It uses the outputs of the elastoplastic folding model to run geologically-consistent earthquake sequences (faulting and folding together).
View article: Applications of continuum mechanics in tectonics lecture materials
Applications of continuum mechanics in tectonics lecture materials Open
Lecture and course materials: weeks 1- 7. Each folder contains a collection of notes, MATLAB scripts and functions that were used to teach continuum mechanics and tectonics.
View article: MLKN position timeseries
MLKN position timeseries Open
Timeseries of MLKN GPS station in rneu format. The header of the .dat file contains all the information needed to ingest the data.
View article: Diverse Slip Behavior of the Banyak Islands Subsegment of the Sunda Megathrust in Sumatra, Indonesia
Diverse Slip Behavior of the Banyak Islands Subsegment of the Sunda Megathrust in Sumatra, Indonesia Open
Nearly every type of slip behavior of which megathrusts are known to be capable of has been observed within a narrow ~75‐km‐wide strip of the Sunda megathrust—the Banyak Islands subsegment. The diverse list of recorded slip events starts w…
View article: Block Model outputs and scripts
Block Model outputs and scripts Open
This folder contains the scripts needed to run "Blocks" and the relevant results from the software used in the paper. The Blocks_*.m scripts should be added in the directory where your Blocks.m file is.