3 Underground Storage Tank (UST) Underground Storage Tank (UST): An underground storage tank (UST) is a confined […]
Glossary
3 
Lumber Moisture Content Grade Lumber moisture grading is a manufacturer-provided value of moisture content, for […]
Lumber Moisture Content Grade
U-Shaped Kitchen U-Shaped Kitchen: A U-shaped kitchen, or a horseshoe kitchen, is a general kitchen […]
U-Shaped Kitchen
Gravel Blanket in Methane Mitigation A gravel blanket is a 2-inch or 4-inch thick layer […]
Gravel Blanket
Mechanical Extraction System Mechanical Extraction System: Per the Los Angeles Department of Building and Safety […]
Mechanical Extraction System
Trench Dam Trench Dam: Per the Los Angeles Department of Building and Safety (LADBS) Methane […]
Trench Dam
3 Active Methane Mitigation Active Methane Mitigation: Active systems refer to the mechanical and electrical components […]
Active Methane Mitigation System
1 Passive Methane Mitigation Passive Methane Mitigation: Passive systems refer to the non-mechanical and non-electric components […]
Passive Methane Mitigation
2 Control Panel in a Methane Mitigation System Control Panel of a Methane Mitigation System: A […]
Control Panel for Methane Mitigation System
2 Methane Alarm System Methane Alarm System: As per the Los Angeles Department of Building and […]
Methane Alarm System
Unobstructed Opening Definition in Methane Mitigation Unobstructed Opening: Per the Los Angeles Department of Building […]
Unobstructed Opening in Methane Mitigation
Single Station Methane Gas Detector Single Station Methane Gas Detector: As per the Los Angeles […]
Single Station Methane Gas Detector
Plat Map Definition Plat Map: A plat map provides the metes and bounds of a […]
Plat Map Definition
1 De-Watering System in Methane Mitigation De-Watering: In accordance with the Los Angeles Department of Building […]
De-watering System
4 Impervious Membrane in Methane Mitigation Impervious Membrane: In accordance with the Los Angeles Department of […]
Impervious Membrane
4 Perforated Horizontal Pipe in Methane Mitigation Perforated Horizontal Pipe: As per the Los Angeles Department […]
Perforated Horizontal Pipe
2 Vent Riser in Methane Mitigation Vent Riser in Methane Mitigation: As per the Los Angeles […]
Vent Riser in Methane Mitigation
2 Design Methane Pressure (Soil Formation Pressure) Design Methane Pressure or Soil Formation Pressure: As per […]
Design Methane Pressure (Soil Formation Pressure)
2 Design Methane Concentration Design Methane Concentration: In accordance with the Los Angeles Department of Building […]
Design Methane Concentration
14 Methane Soil Gas Methane Soil Gas: In geology, methane soil gas refers to the confinement […]
Methane Soil Gas
1 Hydrogen Sulfide Soil Gas (In Natural Gas) Hydrogen Sulfide: Hydrogen sulfide (H2S) soil gas geologically […]
Hydrogen Sulfide Soil Gas
1 Thermosphere Thermosphere: The thermosphere of a terrestrial planet is the fourth and final member of […]
Thermosphere
1 Mesosphere Mesosphere: The mesosphere of a terrestrial planet is the third member of the atmosphere. […]
Mesosphere
3 Stratosphere Stratosphere: The stratosphere of a terrestrial planet is the second-lowest member of the atmosphere. […]
Stratosphere
1 Troposphere Troposphere: The troposphere of a terrestrial planet is the lowest member of the atmosphere. […]
Troposphere
6 Atmosphere Atmosphere: The atmosphere of a terrestrial planet is an outermost series of layers that […]
Atmosphere
6 Petrogenic Gas Petrogenic Gas: In geology, petrogenic gas refers to natural gas that is the […]
Petrogenic Gas
8 Natural Gas Natural Gas: In geology, natural gas means combustible hydrocarbon gas that forms by […]
Natural Gas
6 Biogenic Gas Biogenic Gas: In geology, biogenic gas refers to natural gas that is the […]
Biogenic Gas
Asthenosphere Asthenosphere: The asthenosphere underlies the lithosphere. The Asthenosphere comprises the upper mantle, where isostatic […]
Asthenosphere
Lithosphere Lithosphere: The lithosphere comprises the Earth’s crust as well as part of the upper […]
Lithosphere
1 Well Graded Soil Well Graded: In the soil classification process of geology, well graded soil […]
Well Graded
2 Poorly Graded Soil Poorly Graded: In the soil classification process of geology, poorly graded soil […]
Poorly Graded
3 Volcanology Volcanology: Volcanology is a branch of geology that focuses on the study of volcanos. […]
Volcanology
Diagenesis Diagenesis: In geology, diagenesis refers to the physical and chemical changes of a sedimentary […]
Diagenesis
4 Extrusive Rocks Extrusive Rocks: In the volcanology branch of geology extrusive rocks are igneous rocks […]
Extrusive Rocks
Confined Aquifer Confined Aquifer: In the hydrogeology branch of geology, a confined aquifer is an […]
Confined Aquifer
Unconfined Aquifer Unconfined Aquifer: In the hydrogeology branch of geology, an unconfined aquifer is an […]
Unconfined Aquifer
4 Hydro-Geology (Hydrogeology) Hydro-Geology (Hydrogeology): Hydrogeology is a branch of geology that relates to the study […]
Hydro-Geology (Hydrogeology)
Water Table Water Table: In the hydrogeology branch of geology, the water table represents the […]
Water Table
Epicenter Epicenter: In the seismology branch of geology, an epicenter of an earthquake is the […]
Epicenter
Focus (Hypocenter) Focus (Hypocenter): In the seismology branch of geology, a focus, or hypocenter, refers […]
Focus (Hypocenter)
Connate Water Definition Connate Water: In geology, connate water is groundwater that has been trapped […]
Connate Water
Feldspars Feldspars: In the field of geology, and the branch of mineralogy, feldspars are a […]
Feldspars
1 Alquist-Priolo Earthquake Fault Zoning Act Alquist-Priolo Earthquake Fault Zoning Act: The Alquist-Priolo Earthquake Fault Zoning Act […]
Alquist-Priolo Earthquake Fault Zoning Act
1 Transgression Transgression: In geology, the term transgression is the formation of a specific sequence of […]
Transgression
Regression Regression: In geology, regression is the formation of a specific sequence of sedimentary and […]
Regression
Growth Fault Growth Fault: In geology, a growth fault is a strike-slip fault or dip-slip […]
Growth Fault
Fault Scarp Fault Scarp: In the field of geology, a dip-slip fault scarp is a […]
Fault Scarp
Fault Creep Fault Creep: Fault creep means slow ground displacement of a strike-slip fault or […]
Fault Creep
Provenance Provenance: In the field of geology, and the branch of geomorphology, the term “provenance” […]
Provenance
Mineral Assemblages Mineral Assemblages: In the field of geology and the branch of mineralogy, the […]
Mineral Assemblages
3 Environmental Consultant Environmental Consultant: An environmental consultant is an expert of any profession or field, […]
Environmental Consultant
8 Terrestrial Planet Definition A terrestrial planet is any planet in the universe that has earth-like […]
Terrestrial Planet Definition
Engineering Geology or Geological Engineering Engineering Geology: Engineering geology is also referred to as “geological […]
Engineering Geology & Geological Engineering
11 Seismology Seismology: (seis·mol·o·gy) a branch of geology and geophysics that relates to earthquakes, including but […]
Seismology
5 Environmental Geology Environmental Geology: (en·vi·ron·men·tal ge·ol·o·gy) a branch of geology that relates to the impact […]
Environmental Geology
4 Waterproofing Barrier System Definition A waterproofing barrier system guarantees full protection to walls, foundations, and […]
Waterproofing Barrier System
1 Wing Dam or Wing Dike A “Wing Dam” or “Wing Dike” refers to a dam […]
Wing Dam or Wing Dike Definition
7 Strike-Slip Fault or Transform Fault Strike-Slip Fault (Transform Fault): In the field of geology, a […]
Strike-Slip Fault (Transform Fault) Definition
Oblique-Slip Fault Oblique-Slip Fault: In geology, an oblique-slip fault is a fault that moves parallel […]
Oblique-Slip Fault Definition
2 Listric Fault Listric Fault: In the field of geology, a listric fault refers to a […]
Listric Fault Definition
7 Dip-Slip Fault Dip-Slip Fault: In geology, a dip-slip fault is any fault in which the […]
Dip-Slip Fault Definition
5 Normal Fault Normal Fault: In the field of geology, a normal fault is a type […]
Normal Fault Definition
4 Reverse Fault Reverse Fault: In the field of geology, a reverse fault is a dip-slip […]
Reverse Fault Definition
2 Thrust Fault Thrust Fault: In the field of geology, a thrust fault is a reverse […]
Thrust Fault Definition
2 What is a Concrete Slab and Buttress Dam? A Concrete Slab and Buttress Dam is […]
Concrete Slab and Buttress Dam
4 What is a Concrete Arch Dam? A Concrete Arch Dam is a curved freshwater-retaining structure […]
Concrete Arch Dam
3 What is an Embankment Dam? An Embankment Dam is a freshwater-retaining structure comprising excavated rock, […]
Embankment Dam
5 What is a Concrete Gravity Dam? A Concrete Gravity Dam is also known as “Gravity […]
Concrete Gravity Dam
1 Seismic Risk Definition Seismic risk is the probability that a subject site will be adversely […]
Seismic Risk Definition
1 Monoculture Definition The term “Monoculture,” in the fields of farming and agriculture, refers to a […]
Monoculture Definition
Twinning Definition Twinning is the observed intergrowth of multiple crystals in a symmetrical fashion. This […]
Twinning Definition
Type Section Geologic Definition In geology, the term “type section” refers to a specific stratigraphic […]
Type Section
4 Rock Stratigraphic Unit In the field of geology, a rock stratigraphic unit, or a lithostratigraphic […]
Rock Stratigraphic Unit
Zeolites Definition In geology, zeolites are a group of hydro-alumino-silicate minerals that are compositionally analogous […]
Zeolites
Zoning Mineralogy Definition Zoning is a variation of crystal composition that is a characteristic of […]
Zoning Mineralogy Definition
Index Fossil Definition An Index fossil, in the field of paleontology, refers to a fossil that […]
Index Fossil
3 Intrusive Rocks In the volcanology branch of geology, intrusive rocks are igneous rocks that form […]
Intrusive Rocks
“Test” Definition in Paleontology In the field of paleontology, a subsidiary of geology, the term […]
“Test” Definition in Paleontology
2 Time Stratigraphic Unit Definition A Time Stratigraphic Unit, or a Chronostratigraphic Unit, is a rock […]
Time Stratigraphic Unit
2 Phaneritic Definition In geology, the term Phaneritic applies to the texture of an igneous rock. […]
Phaneritic
Ultramafic Definition In the study of geology, the term “ultramafic” refers to an igneous rock […]
Ultramafic
Recurrence Interval Meaning In the field of geology, the term “Recurrence Interval” refers to the […]
Recurrence Interval
Rigidity Definition Rigidity – In geotechnical engineering and engineering geology, rigidity represents the ratio of […]
Rigidity
Rotational Slide (Slump) Definition Rotational Slide (Slump) – A type of landslide movement that occurs […]
Rotational Slide (Slump)
Settlement Definition In the field of geology, The term settlement means a gradual downward movement […]
Settlement
Seiche Definition The term “Seiche” in geology refers to a wave-oscillation, that comes from any […]
Seiche
Soil Creep Definition Soil Creep is a type of landslide that entails the slow and […]
Soil Creep
Translational Slide Landslide Translational Slide: In the seismology branch of geology, a translational slide is […]
Translational Slide Definition
“Toe” of a Slope Definition The “toe” of a slope is essentially the bottom, or […]
Toe of a Slope
Triggered Creep In the field of geology, the term “Triggered Creep” refers to a type […]
Triggered Creep
Darcy’s Law In the field of geology, Darcy’s Law is the universal and basic equation […]
Darcy’s Law
Hydro-Compaction Definition (Hydrocompaction) The term “Hydro-Compaction” or “Hydrocompaction” in engineering geology refers to the process […]
Hydrocompaction Definition
Mineraloid Definition The term “mineraloid” refers to a natural earth substance that appears to be […]
Mineraloid
Mineral Definition A mineral is defined as an inorganic element, compound, or substance that naturally […]
Mineral
Metamorphic Rock Definition In the field of geology, the term “Metamorphic Rock” refers to a […]
Metamorphic Rock
Sedimentary Rock Definition In geology, the term “Sedimentary Rock” refers to the classification of rock […]
Sedimentary Rock
Volcanic Rock (Igneous) Definition A “Volcanic Rock” is an igneous rock that is finely crystalline […]
Volcanic Rock (Igneous)
Igneous Rock Definition In the field of geology, the term “Igneous Rock” refers to one […]
Igneous Rock
Geologic Time Scale The Geologic Time Scale is an international system used by geologists to […]
Geologic Time Scale
Plutonic Rock (Igneous) Definition The term “Plutonic” in the field of geology refers to an […]
Plutonic Rock (Igneous)
Tsunami Tsunami: In the seismology branch of geology, a tsunami is an oceanic wave (gravitational) […]
Tsunami
Sand Boil A “Sand Boil” is a cone-shaped deposit of sand that is formed during […]
Sand Boil
Seismic Moment Seismic Moment: In the seismology branch of geology, seismic moment represents a measure […]
Seismic Moment
Moment Magnitude (M) Moment Magnitude (M): In the seismology branch of geology, moment magnitude is […]
Moment Magnitude (M)
Subsidence “Subsidence” is a geologic condition, in which a localized mass movement occurs, resulting in […]
Subsidence
Surface-Wave Magnitude “Surface-Wave Magnitude” is the magnitude of an earthquake that scientists estimate using measurements […]
Surface-Wave Magnitude
Topple Definition Topple – Slope movement due to forces that cause an overturning moment about […]
Topple
Runoff (R) The term “Runoff” (R) in hydrogeology and geology refers to the part of […]
Runoff (R)
Potentiometric Surface The term “Potentiometric Surface” means the hydrogeological surface that represents the total hydraulic […]
Potentiometric Surface
Permeability “Permeability” in engineering geology and geotechnical engineering refers to the property of a soil […]
Permeability
Hydraulic Conductivity (K) “Hydraulic Conductivity” (K), in hydrogeology and hydrology, represents the capacity of a […]
Hydraulic Conductivity (K)
Porosity (n) “Porosity” (n), in the geological engineering field, is a percentage value that represents […]
Porosity (n)
Licensed Professional Geologist A “Licensed Professional Geologist” or a “Certified Professional Geologist” is a person […]
Licensed Professional Geologist
Consistency The term “Consistency” in the fields of engineering geology and geotechnical engineering means the […]
Consistency
Consolidation “Consolidation” in geology refers to the gradual or slow reduction in the volume of […]
Consolidation
Critical Void Ratio The “Critical Void Ratio,” in soil science and geology, represents the final […]
Critical Void Ratio
Degree of Saturation (SR) “Degree of Saturation” (SR) is an engineering geology term and refers […]
Degree of Saturation (SR)
Direct Shear Test A Direct Shear Test is a geotechnical engineering laboratory procedure that measures […]
Direct Shear Test
Dilatancy “Dilatancy” is the increase in the bulk volume of a soil substance during deformation. […]
Dilatancy
Gap-Graded The term “Gap-Graded” is used by geologists, engineers, and soil scientists in the geotechnical […]
Gap-Graded
Adsorption “Adsorption” in geology, refers to the attraction and adhesion of the ions or molecules […]
Adsorption
Effective Size (D10) “Effective Size” (D10) is an engineering geology term. Effective Size represents a […]
Effective Size (D10)
Effective Stress (σ’) “Effective Stress” (σ’) is a geotechnical engineering term. Effective Stress is a […]
Effective Stress (σ’)
Liquefaction Liquefaction: Liquefaction is the process by which there is: (1) a sudden and significant […]
Liquefaction
Liquid Limit (LL) “Liquid Limit (LL)” in the field of geological engineering, refers to the […]
Liquid Limit (LL)
Hooke’s Law “Hooke’s Law” is a geological statement relating to the elastic deformation of rocks. […]
Hooke’s Law
Dry Density (ρd) “Dry Density” (ρd) is a value that represents the density of soil […]
Dry Density (ρd)
Dry Strength “Dry Strength” is a value that represents the strength of a soil sample, […]
Dry Strength
Hardpan (Caliche) “Hardpan” is a highly dense and solid layer of soil near the ground […]
Hardpan (Caliche)
Environmental Law Environmental Law refers to the various categories of law that are put in […]
Environmental Law
Retaining Wall Retaining Wall: A structure that provides the support needed to hold (in place) […]
Retaining Wall
Environmental Professional Definition Environmental Professional: As per the EPA’s All Appropriate Inquiries Rule, an environmental […]
Environmental Professional Definition
Soil Compaction Testing or Soil Density Testing Soil compaction testing, or soil density testing, is […]