| 1. Domain | 1.1 Scope of the Domain | Boundaries | The range of phenomena the science includes and excludes. | Includes the physical processes governing Earth’s interior, crust, oceans, atmosphere, magnetic field, gravity field, and dynamic evolution. Covers seismology, volcanism, tectonics, geodynamics, geomagnetism, geodesy, hydrology, cryosphere physics, and interactions across Earth systems. Excludes purely chemical geology, biological ecology, or meteorology unless directly grounded in physical processes. |
| | Scale | The spatial, temporal, or organizational level at which the science operates (e.g., quantum, cellular, social, cosmic). | Operates from atomic lattice processes in minerals, to meter-scale fractures, to crustal plates thousands of kilometers across, to whole-Earth global dynamics. Timescales span microsecond seismic wave propagation to billions of years of planetary evolution. |
| 1.2 Ontological Commitments | Entities | The kinds of things assumed to exist within the domain (particles, organisms, agents, fields, etc.). | Rocks, minerals, melts, fluids, seismic waves, faults, plates, mantle convection cells, magnetic fields, gravity fields, heat fluxes, volcanic systems, ice sheets, groundwater, sediment layers, and crust–mantle–core structural layers. |
| | Properties | The fundamental attributes these entities possess (mass, charge, genotype, preference, etc.). | Density, elasticity, viscosity, temperature, pressure, magnetic susceptibility, electrical conductivity, porosity, permeability, attenuation, seismic velocity, and gravitational potential. |
| | Categories | The basic ontological types used to classify domain elements (substances, processes, relations, structures). | Material layers, wave types, tectonic regimes, stress regimes, deformation modes, geomagnetic domains, hydrologic reservoirs, and geodynamic processes. |
| 1.3 State-Variables | Variables | The measurable or definable properties that describe system conditions. | Temperature, pressure, density, stress, strain, displacement field, fluid saturation, seismic velocity, magnetic field strength, electrical conductivity, and gravitational acceleration. |
| | Parameterization | How variables encode and represent the system’s state. | States encoded by stratigraphic models, velocity profiles, thermal gradients, pressure–depth relations, magnetic field harmonics, gravity anomaly maps, rheological parameters, and deformation tensors. |
| 1.4 Admissible Idealizations | Simplifications | Conceptual reductions used to make the domain tractable (point masses, rational agents, perfect gases). | Layered Earth models, elastic half-space approximations, incompressible mantle flow, linear viscoelasticity, homogeneous crust blocks, spherically symmetric gravity, constant conductivity layers, and ignoring anisotropy in first-order models. |
| | Validity Conditions | The limits and contexts in which idealizations hold or break down. | Valid when lateral variations are small, when deformation is slow, when Earth layers behave approximately elastically or viscously, or when wave frequencies fall within ranges where approximations hold; breaks down in strongly heterogeneous, nonlinear, or rapidly changing environments. |
| 1.5 Domain Assumptions | Structural Assumptions | Background ontological stances such as determinism, continuity, randomness, discreteness. | Assumes Earth materials follow physical laws of mechanics, heat flow, electromagnetism, and fluid dynamics; assumes stratification is meaningful; assumes seismic waves obey continuum mechanics; assumes magnetic and gravity fields arise from known physical sources. |
| | Implicit Commitments | Unstated but necessary assumptions that shape the field’s conceptual structure. | Assumes large-scale averaging represents heterogeneous regions, rheological laws remain valid at depth, seismic noise and heterogeneity can be filtered into useful signals, and remote sensing inversion remains mathematically stable. |
| 1.6 Internal Coherence Requirements | Consistency | The demand that domain concepts do not contradict one another. | Requires consistency between seismic imaging, gravity data, magnetic field measurements, heat flow models, plate tectonics, and geodynamic simulations—no contradictions across observational and physical frameworks. |
| | Compatibility | The requirement that entities, variables, and assumptions fit together into a unified descriptive framework. | Entities, variables, and assumptions must unify into a coherent description of Earth’s internal structure, surface dynamics, magnetic field generation, and long-term planetary evolution. |
| 2. Evidence Layer | 2.1 Observable Phenomena | Observables | The aspects of the domain that can produce detectable signals accessible to measurement. | Observable signals include seismic waveforms, ground motion, gravity anomalies, magnetic field variations, electrical resistivity, heat flow measurements, GPS displacement, strain accumulation, volcanic gas emissions, groundwater level changes, and remote sensing of surface deformation. |
| | Detection Limits | The boundaries of what can be resolved or sensed by current instruments or methods. | Limited by seismic station spacing, noise levels, magnetic and gravity sensor precision, satellite resolution, penetration limits of electromagnetic methods, depth reach of seismic imaging, environmental interference, and atmospheric distortion in remote sensing. |
| 2.2 Measurement Systems | Units | Standardized quantifications (meters, seconds, volts, decibels, dollars, etc.) necessary for consistent comparison. | Uses meters, seconds, pascals, newtons, teslas, siemens per meter, watts per square meter, hertz, kilometers, microgals (gravity), nanoteslas (magnetics), and millimeters for GPS displacement. |
| | Instruments | Devices and tools (microscopes, spectrometers, sensors, surveys, detectors) used to produce measurements. | Instruments include seismometers, gravimeters, magnetometers, GPS receivers, InSAR satellites, tiltmeters, strainmeters, geothermal probes, resistivity and EM sensors, ocean bottom seismometers, and gas analyzers. |
| 2.3 Operational Definitions | Definitions | Terms defined by specific measurement procedures, ensuring empirical clarity. | Terms such as seismic velocity, gravity anomaly, magnetic susceptibility, resistivity, heat flux, tectonic strain rate, and seismic moment are defined through standardized observational and inversion procedures. |
| | Procedures | The explicit steps required to perform a measurement in a reproducible way. | Procedures include seismic event recording, waveform filtering, gravity survey transects, magnetometer mapping, GPS baseline processing, electromagnetic sounding, heat flow drilling, InSAR interferogram generation, and gas sampling. |
| 2.4 Data Acquisition | Protocols | Formal processes for gathering data under controlled or standardized conditions. | Data gathered through continuous seismic monitoring, periodic gravity or magnetic surveys, satellite orbital passes, repeated GPS time series, field campaigns, ocean floor deployments, borehole logging, and multi method observation networks. |
| | Sampling | Rules determining which subset of the domain is measured and how representative it is. | Sampling rules include spatial grids for surveys, time sampling based on seismic or volcanic activity, seasonal sampling for hydrology, multi depth sampling in drilling, and multispectral sampling in remote sensing. |
| 2.5 Data Character & Format | Data Types | The form raw evidence takes (time series, spectra, images, counts, qualitative records). | Data appears as seismic traces, gravity or magnetic anomaly maps, resistivity profiles, heat flow curves, GPS displacement time series, interferograms, geological cross sections, and gas concentration logs. |
| | Resolution | The granularity or precision with which data is captured. | Determined by sensor sensitivity, station spacing, satellite pixel size, EM frequency range, seismic frequency content, borehole depth resolution, and limitations imposed by noise or environmental conditions. |
| 2.6 Reliability & Calibration | Calibration | Adjustment procedures ensuring instruments produce accurate results. | Calibration uses reference seismic sources, gravity base stations, magnetic field standards, GPS reference frames, controlled EM pulses, thermal calibration standards, instrument cross calibration, and repeated survey baselines. |
| | Error Characterization | Identification and quantification of noise, uncertainty, bias, and measurement error. | Errors arise from environmental noise, instrument drift, atmospheric delays, subsurface heterogeneity, inversion non uniqueness, aliasing of sparse sampling, sensor orientation errors, and temporal variability unrelated to target signals. |
| 3. Structural Layer | 3.1 Patterns & Regularities | Laws / Relations | Stable, repeatable patterns governing how observables behave across conditions. | Stable patterns include seismic wave velocity–depth relationships, elastic wave propagation laws, gravity anomaly correlations with density variations, magnetic field secular variation, heat flow scaling with depth, plate motion relationships, and predictable stress accumulation and release cycles. |
| | Invariants | Quantities or properties that remain constant under transformations (symmetries, conservation laws). | Invariants include conservation of mass, momentum, and energy in Earth systems; stable mineral phase boundaries at given pressures and temperatures; geomagnetic field harmonics; and constant seismic travel time curves for stable structures. |
| 3.2 Causal Architecture | Mechanisms | Underlying processes or structures that produce the observed regularities. | Mechanisms arise from mantle convection, lithospheric stress accumulation, fault rupture dynamics, buoyancy driven flow, thermal diffusion, mineral phase transitions, electromagnetic induction, fluid flow in porous media, and gravity driven mass redistribution. |
| | Pathways | Organized sequences of interactions forming a causal chain or network. | Pathways include strain accumulation leading to earthquakes, magma ascent and eruption, heat transfer from core to surface, plate motion through convection, groundwater migration, isostatic uplift, and geomagnetic field generation through core fluid motions. |
| 3.3 Theoretical Vocabulary | Concepts | Core terms that encode the domain’s structure (force, gene, equilibrium, field). | Core terms include seismic velocity, attenuation, stress, strain, rheology, heat flow, density contrast, isostasy, magnetic induction, conductivity, anisotropy, and lithospheric thickness. |
| | Classifications | Taxonomies, categories, or typologies that organize entities and relations. | Classifies wave types (P waves, S waves, surface waves), tectonic regimes (convergent, divergent, transform), crustal types (continental, oceanic), geomagnetic features, hydrologic reservoirs, and Earth layers (crust, mantle, core). |
| 3.4 Formal Representations | Equations | Mathematical constructs expressing laws, relations, or mechanisms. | Includes elastic wave equations, Navier-Stokes equations for mantle flow, heat conduction equations, gravity potential equations, magnetic induction equations, Darcy’s law, and constitutive relations for viscoelastic and plastic deformation. |
| | Models | Structured representations—mathematical, computational, or conceptual—used to predict and explain phenomena. | Uses seismic inversion models, mantle convection models, geodynamic simulations, gravity field models, magnetic field evolution models, groundwater flow models, volcanic plumbing models, and crustal deformation models. |
| 3.5 Idealized Structures | Simplified Models | Purposeful abstractions that capture essential dynamics while omitting irrelevant detail. | Idealizations include layered Earth models, homogeneous half spaces, isotropic elasticity, single phase flow, equilibrium thermodynamics, linear rheology, spherically symmetric gravity, and 2D approximations of inherently 3D systems. |
| | Limit Conditions | Regimes where specific models or approximations hold (classical vs. quantum, linear vs. nonlinear). | Valid when lateral variations are small, deformation is slow and continuous, temperature and composition gradients are moderate, and seismic frequencies fit elastic assumptions; breaks down in highly nonlinear, heterogeneous, or chemically reactive environments. |
| 3.6 Integrative Frameworks | Unifying Theories | Higher-order structures that connect disparate laws or mechanisms under a coherent whole. | Includes frameworks linking plate tectonics, mantle convection, geomagnetism, seismology, heat flow, and gravity into a unified model of Earth structure and evolution. |
| | Interdisciplinary Links | Points where the theory connects to adjacent sciences or larger explanatory systems. | Links to geology, volcanology, hydrology, atmospheric science, planetary science, materials physics, and environmental engineering. |
| 4. Method Layer | 4.1 Inquiry Design | Experimental Design | Structured plans for manipulating variables to test causal claims. | Experiments manipulate survey geometry, seismic source characteristics, EM frequencies, borehole depth, sampling interval, inversion parameters, or laboratory pressure–temperature conditions to test causal effects on wave propagation, resistivity behavior, deformation, fluid flow, or magnetic induction. |
| | Observational Design | Systematic approaches for gathering non-manipulated data (surveys, field studies, natural experiments). | Observational approaches monitor natural processes such as earthquakes, volcanic activity, crustal deformation, groundwater changes, magnetic storms, and long-term geodynamic evolution without any researcher-imposed conditions. |
| 4.2 Testing & Validation | Hypothesis Testing | Procedures for evaluating whether evidence supports or contradicts specific claims. | Hypotheses evaluated by comparing observed seismic travel times, anomaly maps, deformation fields, magnetic variations, heat flow patterns, or fluid responses with predictions from geodynamic, seismic, or EM models. |
| | Replication | The requirement that results be independently reproducible under similar conditions. | Replication occurs via repeated surveys, multi-season sampling, cross-station verification, use of independent sensor networks, repeated field experiments, reprocessed satellite passes, and controlled laboratory replications under identical pressure–temperature conditions. |
| 4.3 Inference & Evaluation | Statistical Inference | Rules for drawing conclusions from noisy or incomplete data. | Methods include inversion uncertainty quantification, regression of anomaly–property relationships, probabilistic seismic hazard analysis, Bayesian geophysical inversion, spectral analysis of waveforms, bootstrapping of deformation time series, and noise modeling. |
| | Model Comparison | Criteria (fit, simplicity, predictive accuracy, robustness) used to evaluate competing models. | Models compared by fit quality to seismic, gravity, magnetic, EM, and GPS data; predictive accuracy; physical plausibility; stability under sampling changes; robustness to noise; and agreement with independent geological constraints. |
| 4.4 Error Management | Error Analysis | Identification and quantification of random and systematic errors. | Errors arise from sensor noise, station misorientation, atmospheric delays, sparse coverage, inversion non-uniqueness, model parameter uncertainty, terrain effects, shallow heterogeneity, mixing of unrelated signals, and numerical solver inaccuracies. |
| | Bias Control | Methods for minimizing subjective, instrumental, or procedural biases. | Bias minimized through blind processing, cross-instrument calibration, redundant sensor arrays, careful survey design, filtering of anthropogenic noise, independent parallel inversion pipelines, and geological sanity checks on all models. |
| 4.5 Adjudication & Revision | Peer Scrutiny | Collective evaluation of claims through critique, review, and debate. | Results evaluated through multi-team intercomparison, reproduction by independent networks, publication peer review, global model comparison exercises, data reprocessing challenges, and alignment with geological, geochemical, or geodynamic evidence. |
| | Theory Revision | Procedures for modifying, replacing, or discarding models based on new evidence. | Theories revised when anomalies persist across multiple methods, when seismic imaging contradicts existing structure models, when magnetic or gravity fields evolve unexpectedly, or when laboratory mineral physics reveals new phase behavior requiring updated Earth models. |
| 4.6 Integrity Conditions | Transparency | Requirements to disclose methods, data, assumptions, and limitations. | Requires disclosure of survey geometry, sensor calibration, processing pipelines, inversion assumptions, noise models, uncertainties, dataset coverage, and any limitations of measurements or models. |
| | Ethical Standards | Norms ensuring responsible conduct in experimentation, data handling, and publication. | Requires accurate reporting, environmental protection during field surveys, responsible handling of geological hazards, avoidance of selective omission of data, and integrity in interpreting models that affect public safety (e.g., seismic risk, volcanic forecasting). |