| 1. Domain | 1.1 Scope of the Domain | Boundaries | The range of phenomena the science includes and excludes. | Studies the deformation of Earth’s crust and mantle, including faults, folds, fabrics, strain patterns, tectonic forces, plate interactions, and stress fields; excludes petrology unless tied to deformation, and excludes pure geophysics unless linked to structural processes. |
| | Scale | The spatial, temporal, or organizational level at which the science operates (e.g., quantum, cellular, social, cosmic). | Operates from atomic-scale lattice strain → mineral/grain-scale deformation → outcrop-scale folds and faults → crustal blocks → plate boundaries → whole-Earth tectonic regimes. |
| 1.2 Ontological Commitments | Entities | The kinds of things assumed to exist within the domain (particles, organisms, agents, fields, etc.). | Faults, folds, shear zones, joints, fractures, plates, blocks, lithosphere, asthenosphere, stress fields, strain markers, lineations, foliations, fabrics, ductile shear bands, rigid bodies, microstructures. |
| | Properties | The fundamental attributes these entities possess (mass, charge, genotype, preference, etc.). | Stress, strain, viscosity, strength, rheology, displacement, slip rate, orientation, symmetry, anisotropy, cohesion/friction, strain rate, competency, ductility/brittleness, mechanical layering. |
| | Categories | The basic ontological types used to classify domain elements (substances, processes, relations, structures). | Fault types (normal, reverse, thrust, strike-slip), fold types (anticline, syncline, monocline), deformation regimes (brittle/ductile), plate boundaries (divergent, convergent, transform), structural fabrics, tectonic settings. |
| 1.3 State-Variables | Variables | The measurable or definable properties that describe system conditions. | Stress magnitude/orientation, strain magnitude/orientation, temperature, pressure, fluid pressure, strain rate, displacement, thickness, viscosity, lithospheric thickness, plate velocity. |
| | Parameterization | How variables encode and represent the system’s state. | States encoded by Mohr circles, strain ellipsoids, orientation data (strike/dip/plunge), displacement vectors, rheological parameters, P–T conditions, plate-motion vectors, finite/incremental strain tensors. |
| 1.4 Admissible Idealizations | Simplifications | Conceptual reductions used to make the domain tractable (point masses, rational agents, perfect gases). | Treating rocks as homogeneous, isotropic, elastic or viscous; assuming plane strain; ignoring fluids; ignoring temperature changes; modeling crust as rigid blocks; ignoring complex folding/faulting interactions. |
| | Validity Conditions | The limits and contexts in which idealizations hold or break down. | Valid for first-order approximations, large-scale plate kinematics, simple brittle faults, uniform stress fields; breaks down in heterogeneous rocks, high-strain shear zones, anisotropic fabrics, variable rheologies, and multi-phase deformation. |
| 1.5 Domain Assumptions | Structural Assumptions | Background ontological stances such as determinism, continuity, randomness, discreteness. | Deformation follows physical laws of stress and strain; structures form in response to tectonic forces; strain is recorded in rocks; plate motions drive crustal architecture; rheology governs deformation behavior. |
| | Implicit Commitments | Unstated but necessary assumptions that shape the field’s conceptual structure. | Assumes consistent stress/strain relationships, mappable structures, stable deformation indicators, interpretable kinematics, and reliable scaling from micro to macro-structures. |
| 1.6 Internal Coherence Requirements | Consistency | The demand that domain concepts do not contradict one another. | Requires coherence among observed structures, calculated stress fields, kinematic interpretations, geophysical evidence, plate-motion models, and deformation histories. |
| | Compatibility | The requirement that entities, variables, and assumptions fit together into a unified descriptive framework. | Demands alignment between structural geology, plate tectonics, mineral deformation processes, geodynamics, geophysics, and field observations within a unified tectonic-deformation framework. |
| 2. Evidence Layer | 2.1 Observable Phenomena | Observables | The aspects of the domain that can produce detectable signals accessible to measurement. | Fault scarps, fold geometries, joint sets, shear zones, foliations, lineations, boudinage, microstructures, displacement offsets, slickensides, earthquake locations, GPS motions, crustal thickness changes, seismic anisotropy. |
| | Detection Limits | The boundaries of what can be resolved or sensed by current instruments or methods. | Limited by map scale, exposure quality, resolution of seismic imaging, GPS precision, outcrop availability, microstructural visibility, noise in geophysical data, inaccessible depth, and erosion/vegetation cover. |
| 2.2 Measurement Systems | Units | Standardized quantifications (meters, seconds, volts, decibels, dollars, etc.) necessary for consistent comparison. | Orientation (strike/dip), plunge/trend, displacement (m–km), strain (%), stress (MPa), shear strain (γ), GPS velocity (mm/yr), seismic velocity (km/s), crustal thickness (km), depth (m–km), time (Ma). |
| | Instruments | Devices and tools (microscopes, spectrometers, sensors, surveys, detectors) used to produce measurements. | Brunton compasses, laser rangefinders, drones, LiDAR, GPS networks, seismographs, seismic arrays, microstructural microscopes (optical/SEM/TEM), stress meters, InSAR satellites, gravimeters, magnetotelluric sensors. |
| 2.3 Operational Definitions | Definitions | Terms defined by specific measurement procedures, ensuring empirical clarity. | Fault type defined by sense of slip; fold type defined by geometry; strain defined by change in shape relative to original; plate motion defined by GPS vector; seismic event defined by hypocenter and magnitude; stress orientation defined by focal mechanisms. |
| | Procedures | The explicit steps required to perform a measurement in a reproducible way. | Field measurement of structural orientations, mapping fault/fold traces, sampling oriented blocks, seismic surveys, GPS time-series acquisition, thin-section microstructure analysis, InSAR processing, geophysical inversion workflows. |
| 2.4 Data Acquisition | Protocols | Formal processes for gathering data under controlled or standardized conditions. | Systematic structural mapping, orientation grid sampling, seismic-reflection/refraction surveys, GPS station networks, remote-sensing passes, multi-scale microstructural sampling, repeated geophysical monitoring campaigns. |
| | Sampling | Rules determining which subset of the domain is measured and how representative it is. | Multiple outcrops/stations, orientation replicates, depth-dependent sampling, multi-grain microstructures, regional transects, across-fault sampling, repeat GPS epochs, seismic-event catalogs. |
| 2.5 Data Character & Format | Data Types | The form raw evidence takes (time series, spectra, images, counts, qualitative records). | Orientation datasets, geological maps, seismic profiles, focal-mechanism solutions, GPS vector fields, strain tensors, fault-slip data tables, microstructural images, InSAR displacement maps, cross-sections. |
| | Resolution | The granularity or precision with which data is captured. | Determined by field measurement precision, seismic wavelength, instrument sampling rate, GPS station density, map scale, microstructure imaging resolution, and spatial/temporal resolution of remote sensing. |
| 2.6 Reliability & Calibration | Calibration | Adjustment procedures ensuring instruments produce accurate results. | Compass calibration, GPS drift correction, seismic-instrument calibration, remote-sensing geometric correction, microscope calibration, LiDAR system calibration, geophysical standardization for noise floors. |
| | Error Characterization | Identification and quantification of noise, uncertainty, bias, and measurement error. | Orientation bias, outcrop distortion, weathering, seismic noise, GPS multipath error, structural overprints, misidentification of kinematic indicators, inversion non-uniqueness, signal aliasing, and sampling anisotropy. |
| 3. Structural Layer | 3.1 Patterns & Regularities | Laws / Relations | Stable, repeatable patterns governing how observables behave across conditions. | Stress–strain relationships govern deformation; faults and folds form in predictable orientations relative to principal stresses; strain ellipsoids evolve systematically; plate motion obeys conservation of momentum and continuity; brittle–ductile transitions follow P–T–strain-rate laws. |
| | Invariants | Quantities or properties that remain constant under transformations (symmetries, conservation laws). | Symmetry in strain ellipsoids, consistent fold geometries for similar kinematic regimes, Mohr-circle stress invariants, stable plate-motion directions over geological time, consistent fault-slip indicators for a given stress field. |
| 3.2 Causal Architecture | Mechanisms | Underlying processes or structures that produce the observed regularities. | Fracturing, frictional sliding, folding, viscous flow, dislocation creep, diffusion creep, cataclasis, shear-zone formation, plate boundary processes (subduction, rifting, transform motion), isostatic adjustment, lithospheric flexure. |
| | Pathways | Organized sequences of interactions forming a causal chain or network. | Fault initiation → propagation → linkage; fold initiation → amplification → lock-up; progressive shear-zone development; rock-flow trajectories in ductile regimes; plate-boundary evolution sequences; strain-path progression in deformation histories. |
| 3.3 Theoretical Vocabulary | Concepts | Core terms that encode the domain’s structure (force, gene, equilibrium, field). | Stress, strain, rheology, competency, brittle vs ductile behavior, strain ellipsoid, Mohr circle, kinematics, dynamics, fabric, foliation, lineation, shear sense, plate kinematics, deformation regime. |
| | Classifications | Taxonomies, categories, or typologies that organize entities and relations. | Fault types (normal, reverse, thrust, strike-slip), fold types (anticline, syncline, monocline), deformation styles (brittle, ductile, brittle-ductile), plate margins (divergent, convergent, transform), shear-zone types, fabric types (S-foliation, C-shear bands, L-lineations). |
| 3.4 Formal Representations | Equations | Mathematical constructs expressing laws, relations, or mechanisms. | Stress-strain equations, Hooke’s law, power-law creep equations, Mohr–Coulomb failure criterion, Byerlee’s law, plate-motion vectors, strain-rate tensors, flexure equations, kinematic rotation equations. |
| | Models | Structured representations—mathematical, computational, or conceptual—used to predict and explain phenomena. | Elastic, viscous, plastic, viscoelastic, and elasto-plastic rheology models; plate-tectonic models; fault-slip models; fold-growth models; strain-path simulations; geodynamic models of mantle convection and lithospheric deformation. |
| 3.5 Idealized Structures | Simplified Models | Purposeful abstractions that capture essential dynamics while omitting irrelevant detail. | Perfectly homogeneous materials, linear elasticity, constant strain rate, no fluids, isotropic rock strength, planar faults, ideal cylindrical folds, single-phase deformation, 2-D plane-strain assumptions. |
| | Limit Conditions | Regimes where specific models or approximations hold (classical vs. quantum, linear vs. nonlinear). | Break down in heterogeneous rocks, anisotropic fabrics, fluid-rich regimes, high-strain shear zones, temperature-dependent rheology, multiphase deformation, curved faults/folds, 3-D strain fields, transient stress changes. |
| 3.6 Integrative Frameworks | Unifying Theories | Higher-order structures that connect disparate laws or mechanisms under a coherent whole. | Integration of field structures, kinematics, rheology, geophysics, and plate tectonics into a unified framework connecting stress → strain → structure → plate motions; links microstructures to crustal-scale deformation and global geodynamics. |
| | Interdisciplinary Links | Points where the theory connects to adjacent sciences or larger explanatory systems. | Intersects with geophysics (seismic anisotropy, imaging), geodesy (GPS plate motions), petrology (deformation reactions), geomorphology (fault-controlled landscapes), earthquake physics, and planetary tectonics. |
| 4. Method Layer | 4.1 Inquiry Design | Experimental Design | Structured plans for manipulating variables to test causal claims. | Controlling deformation rate, confining pressure, temperature, fluid pressure, strain path, loading direction, and rock composition in laboratory deformation experiments to test causal mechanical and tectonic hypotheses. |
| | Observational Design | Systematic approaches for gathering non-manipulated data (surveys, field studies, natural experiments). | Monitoring natural deformation without manipulation: field mapping of structures, remote-sensing displacement, seismicity patterns, GPS motions, microstructural overprints, and spontaneous strain accumulation. |
| 4.2 Testing & Validation | Hypothesis Testing | Procedures for evaluating whether evidence supports or contradicts specific claims. | Comparing predicted fault geometries, fold shapes, strain ellipsoids, shear-sense indicators, and plate-motion vectors with field measurements, seismic data, GPS geodesy, microstructures, and numerical-model outputs. |
| | Replication | The requirement that results be independently reproducible under similar conditions. | Repeating orientation measurements, outcrop surveys, seismic inversions, GPS epochs, microstructural analyses, mechanical tests, and numerical simulations across different sites, samples, and timescales. |
| 4.3 Inference & Evaluation | Statistical Inference | Rules for drawing conclusions from noisy or incomplete data. | Calculating uncertainties in orientation data, stress/strain tensors, slip-rate estimates, seismic-source parameters, GPS velocities, fold-geometry fits, and correlation between structures and tectonic regimes. |
| | Model Comparison | Criteria (fit, simplicity, predictive accuracy, robustness) used to evaluate competing models. | Evaluating competing structural interpretations (e.g., fold vs fault-dominated deformation), different rheological laws, alternative stress-field models, distinct plate reconstructions, and numerical geodynamic models. |
| 4.4 Error Management | Error Analysis | Identification and quantification of random and systematic errors. | Identifying measurement errors (compass mis-read, poor exposure), GPS noise, seismic inversion non-uniqueness, sampling bias, structural overprinting, weathering effects, map-scale distortion, and instrument drift. |
| | Bias Control | Methods for minimizing subjective, instrumental, or procedural biases. | Randomizing measurement locations, blinding structural interpretations when possible, validating compass/GPS instruments, cross-checking seismic solutions, using multiple kinematic indicators, applying consistent mapping standards. |
| 4.5 Adjudication & Revision | Peer Scrutiny | Collective evaluation of claims through critique, review, and debate. | Independent review of fault/fold interpretations, stress-field calculations, geophysical inversions, plate-motion models, kinematic reconstructions, and deformation mechanisms across teams or laboratories. |
| | Theory Revision | Procedures for modifying, replacing, or discarding models based on new evidence. | Updating tectonic models, revising deformation histories, correcting kinematic/strain interpretations, redefining plate boundaries, modifying rheological models, and incorporating contradictory seismic or field evidence. |
| 4.6 Integrity Conditions | Transparency | Requirements to disclose methods, data, assumptions, and limitations. | Full reporting of mapping methods, instrument calibration, data filtering, seismic-processing parameters, GPS noise models, numerical-model assumptions, and criteria used for structural interpretation. |
| | Ethical Standards | Norms ensuring responsible conduct in experimentation, data handling, and publication. | Honest reporting of uncertain measurements, ambiguous structures, model limitations, failed inversions, sampling restrictions, and adherence to ethical and legal standards in fieldwork and data collection. |