Gravel Blanket in Methane Mitigation A gravel blanket is a 2-inch or 4-inch thick layer […] Gravel BlanketNovember 11, 2021 in Glossary by Karen Pacle (updated on November 11, 2021)
Mechanical Extraction System Mechanical Extraction System: Per the Los Angeles Department of Building and Safety […] Mechanical Extraction SystemSeptember 9, 2021 in Glossary by Karen Pacle
Trench Dam Trench Dam: Per the Los Angeles Department of Building and Safety (LADBS) Methane […] Trench DamSeptember 1, 2021 in Glossary by Karen Pacle
2 Methane Alarm System Methane Alarm System: As per the Los Angeles Department of Building and […] Methane Alarm SystemAugust 6, 2021 in Glossary by Karen Pacle (updated on September 1, 2021)
Unobstructed Opening Definition in Methane Mitigation Unobstructed Opening: Per the Los Angeles Department of Building […] Unobstructed Opening in Methane MitigationAugust 5, 2021 in Glossary by Karen Pacle
Single Station Methane Gas Detector Single Station Methane Gas Detector: As per the Los Angeles […] Single Station Methane Gas DetectorAugust 5, 2021 in Glossary by Karen Pacle (updated on August 5, 2021)
1 De-Watering System in Methane Mitigation De-Watering: In accordance with the Los Angeles Department of Building […] De-watering SystemJuly 28, 2021 in Glossary by Karen Pacle (updated on July 28, 2021)
5 Impervious Membrane in Methane Mitigation Impervious Membrane: In accordance with the Los Angeles Department of […] Impervious MembraneJuly 27, 2021 in Glossary by Karen Pacle (updated on July 28, 2021)
4 Perforated Horizontal Pipe in Methane Mitigation Perforated Horizontal Pipe: As per the Los Angeles Department […] Perforated Horizontal PipeJuly 27, 2021 in Glossary by Karen Pacle (updated on July 27, 2021)
2 Vent Riser in Methane Mitigation Vent Riser in Methane Mitigation: As per the Los Angeles […] Vent Riser in Methane MitigationJuly 27, 2021 in Glossary by Karen Pacle (updated on July 27, 2021)
Asthenosphere Asthenosphere: The asthenosphere underlies the lithosphere. The Asthenosphere comprises the upper mantle, where isostatic […] AsthenosphereJuly 2, 2021 in Glossary by Karen Pacle
Lithosphere Lithosphere: The lithosphere comprises the Earth’s crust as well as part of the upper […] LithosphereJuly 2, 2021 in Glossary by Karen Pacle (updated on July 2, 2021)
Diagenesis Diagenesis: In geology, diagenesis refers to the physical and chemical changes of a sedimentary […] DiagenesisJune 28, 2021 in Glossary by Karen Pacle
4 Extrusive Rocks Extrusive Rocks: In the volcanology branch of geology extrusive rocks are igneous rocks […] Extrusive RocksJune 28, 2021 in Glossary by Karen Pacle (updated on June 28, 2021)
Confined Aquifer Confined Aquifer: In the hydrogeology branch of geology, a confined aquifer is an […] Confined AquiferJune 25, 2021 in Glossary by Karen Pacle (updated on June 25, 2021)
Unconfined Aquifer Unconfined Aquifer: In the hydrogeology branch of geology, an unconfined aquifer is an […] Unconfined AquiferJune 25, 2021 in Glossary by Karen Pacle (updated on June 25, 2021)
Water Table Water Table: In the hydrogeology branch of geology, the water table represents the […] Water TableJune 25, 2021 in Glossary by Karen Pacle (updated on June 25, 2021)
Epicenter Epicenter: In the seismology branch of geology, an epicenter of an earthquake is the […] EpicenterJune 24, 2021 in Glossary by Karen Pacle (updated on June 24, 2021)
Focus (Hypocenter) Focus (Hypocenter): In the seismology branch of geology, a focus, or hypocenter, refers […] Focus (Hypocenter)June 24, 2021 in Glossary by Karen Pacle (updated on June 24, 2021)
Connate Water Definition Connate Water: In geology, connate water is groundwater that has been trapped […] Connate WaterJune 23, 2021 in Glossary by Karen Pacle (updated on June 23, 2021)
Feldspars Feldspars: In the field of geology, and the branch of mineralogy, feldspars are a […] FeldsparsJune 23, 2021 in Glossary by Karen Pacle
1 Transgression Transgression: In geology, the term transgression is the formation of a specific sequence of […] TransgressionJune 20, 2021 in Glossary by Karen Pacle (updated on June 20, 2021)
Regression Regression: In geology, regression is the formation of a specific sequence of sedimentary and […] RegressionJune 20, 2021 in Glossary by Karen Pacle (updated on June 20, 2021)
Growth Fault Growth Fault: In geology, a growth fault is a strike-slip fault or dip-slip […] Growth FaultJune 18, 2021 in Glossary by Karen Pacle (updated on June 21, 2021)
Fault Scarp Fault Scarp: In the field of geology, a dip-slip fault scarp is a […] Fault ScarpJune 18, 2021 in Glossary by Karen Pacle (updated on June 21, 2021)
Fault Creep Fault Creep: Fault creep means slow ground displacement of a strike-slip fault or […] Fault CreepJune 17, 2021 in Glossary by Karen Pacle (updated on June 21, 2021)
1 Facies Facies: In the field of geology, the term “facies” represents a mappable, areally restricted […] FaciesJune 17, 2021 in Glossary by Karen Pacle (updated on June 17, 2021)
Provenance Provenance: In the field of geology, and the branch of geomorphology, the term “provenance” […] ProvenanceJune 17, 2021 in Glossary by Karen Pacle (updated on June 17, 2021)
Mineral Assemblages Mineral Assemblages: In the field of geology and the branch of mineralogy, the […] Mineral AssemblagesJune 17, 2021 in Glossary by Karen Pacle (updated on June 17, 2021)
1 Cation Cation: In the fields of chemistry and geochemistry, a cation is a positively charged […] CationJune 17, 2021 in Glossary by Karen Pacle (updated on June 17, 2021)
1 Anion Anion: In the fields of chemistry and geochemistry, an anion is a negatively charged […] AnionJune 17, 2021 in Glossary by Karen Pacle (updated on June 17, 2021)
Twinning Definition Twinning is the observed intergrowth of multiple crystals in a symmetrical fashion. This […] Twinning DefinitionFebruary 16, 2021 in Glossary by Karen Pacle
Type Section Geologic Definition In geology, the term “type section” refers to a specific stratigraphic […] Type SectionFebruary 1, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
4 Rock Stratigraphic Unit In the field of geology, a rock stratigraphic unit, or a lithostratigraphic […] Rock Stratigraphic UnitJanuary 31, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
Zeolites Definition In geology, zeolites are a group of hydro-alumino-silicate minerals that are compositionally analogous […] ZeolitesJanuary 31, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
Zoning Mineralogy Definition Zoning is a variation of crystal composition that is a characteristic of […] Zoning Mineralogy DefinitionJanuary 31, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
Index Fossil Definition An Index fossil, in the field of paleontology, refers to a fossil that […] Index FossilJanuary 31, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
3 Intrusive Rocks In the volcanology branch of geology, intrusive rocks are igneous rocks that form […] Intrusive RocksJanuary 30, 2021 in Glossary by Karen Pacle (updated on June 28, 2021)
1 Mafic Definition In geology, “mafic” is a term that describes an igneous rock that has […] MaficJanuary 30, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
“Test” Definition in Paleontology In the field of paleontology, a subsidiary of geology, the term […] “Test” Definition in PaleontologyJanuary 30, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
2 Time Stratigraphic Unit Definition A Time Stratigraphic Unit, or a Chronostratigraphic Unit, is a rock […] Time Stratigraphic UnitJanuary 30, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
2 Aphanitic Definition Aphanitic: In geology, the term aphanitic describes the texture of plutonic or volcanic […] AphaniticJanuary 29, 2021 in Glossary by Karen Pacle (updated on June 29, 2021)
2 Phaneritic Definition In geology, the term Phaneritic applies to the texture of an igneous rock. […] PhaneriticJanuary 29, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
Ultramafic Definition In the study of geology, the term “ultramafic” refers to an igneous rock […] UltramaficJanuary 27, 2021 in Glossary by Karen Pacle (updated on February 1, 2021)
2 Silicates Definition In the fields of geology and mineralogy, the term “silicates” refers to compounds […] SilicatesJanuary 26, 2021 in Glossary by Karen Pacle (updated on January 26, 2021)
Recurrence Interval Meaning In the field of geology, the term “Recurrence Interval” refers to the […] Recurrence IntervalJanuary 25, 2021 in Glossary by Karen Pacle
Rigidity Definition Rigidity – In geotechnical engineering and engineering geology, rigidity represents the ratio of […] RigidityJanuary 24, 2021 in Glossary by Karen Pacle
Rotational Slide (Slump) Definition Rotational Slide (Slump) – A type of landslide movement that occurs […] Rotational Slide (Slump)January 23, 2021 in Glossary by Karen Pacle
Settlement Definition In the field of geology, The term settlement means a gradual downward movement […] SettlementJanuary 23, 2021 in Glossary by Karen Pacle
Seiche Definition The term “Seiche” in geology refers to a wave-oscillation, that comes from any […] SeicheJanuary 23, 2021 in Glossary by Karen Pacle
Soil Creep Definition Soil Creep is a type of landslide that entails the slow and […] Soil CreepJanuary 23, 2021 in Glossary by Karen Pacle
Translational Slide Landslide Translational Slide: In the seismology branch of geology, a translational slide is […] Translational Slide DefinitionJanuary 23, 2021 in Glossary by Karen Pacle (updated on June 24, 2021)
“Toe” of a Slope Definition The “toe” of a slope is essentially the bottom, or […] Toe of a SlopeJanuary 23, 2021 in Glossary by Karen Pacle (updated on January 23, 2021)
Triggered Creep In the field of geology, the term “Triggered Creep” refers to a type […] Triggered CreepJanuary 22, 2021 in Glossary by Karen Pacle
Darcy’s Law In the field of geology, Darcy’s Law is the universal and basic equation […] Darcy’s LawJanuary 15, 2021 in Glossary by Karen Pacle (updated on January 15, 2021)
Hydro-Compaction Definition (Hydrocompaction) The term “Hydro-Compaction” or “Hydrocompaction” in engineering geology refers to the process […] Hydrocompaction DefinitionJanuary 15, 2021 in Glossary by Karen Pacle (updated on January 22, 2021)
Tsunami Tsunami: In the seismology branch of geology, a tsunami is an oceanic wave (gravitational) […] TsunamiDecember 31, 2020 in Glossary by Karen Pacle (updated on June 24, 2021)
Sand Boil A “Sand Boil” is a cone-shaped deposit of sand that is formed during […] Sand BoilDecember 20, 2020 in Glossary by Karen Pacle
Seismic Moment Seismic Moment: In the seismology branch of geology, seismic moment represents a measure […] Seismic MomentDecember 17, 2020 in Glossary by Karen Pacle (updated on June 24, 2021)
Moment Magnitude (M) Moment Magnitude (M): In the seismology branch of geology, moment magnitude is […] Moment Magnitude (M)December 17, 2020 in Glossary by Karen Pacle (updated on June 24, 2021)
Subsidence “Subsidence” is a geologic condition, in which a localized mass movement occurs, resulting in […] SubsidenceDecember 17, 2020 in Glossary by Karen Pacle
Surface-Wave Magnitude “Surface-Wave Magnitude” is the magnitude of an earthquake that scientists estimate using measurements […] Surface-Wave MagnitudeDecember 17, 2020 in Glossary by Karen Pacle
Topple Definition Topple – Slope movement due to forces that cause an overturning moment about […] ToppleDecember 17, 2020 in Glossary by Karen Pacle (updated on January 23, 2021)
Runoff (R) The term “Runoff” (R) in hydrogeology and geology refers to the part of […] Runoff (R)December 16, 2020 in Glossary by Karen Pacle
Potentiometric Surface The term “Potentiometric Surface” means the hydrogeological surface that represents the total hydraulic […] Potentiometric SurfaceDecember 16, 2020 in Glossary by Karen Pacle
Permeability “Permeability” in engineering geology and geotechnical engineering refers to the property of a soil […] PermeabilityDecember 16, 2020 in Glossary by Karen Pacle (updated on December 16, 2020)
Hydraulic Conductivity (K) “Hydraulic Conductivity” (K), in hydrogeology and hydrology, represents the capacity of a […] Hydraulic Conductivity (K)December 16, 2020 in Glossary by Karen Pacle (updated on January 15, 2021)
Porosity (n) “Porosity” (n), in the geological engineering field, is a percentage value that represents […] Porosity (n)December 16, 2020 in Glossary by Karen Pacle
Consistency The term “Consistency” in the fields of engineering geology and geotechnical engineering means the […] ConsistencyDecember 15, 2020 in Glossary by Karen Pacle
Consolidation “Consolidation” in geology refers to the gradual or slow reduction in the volume of […] ConsolidationDecember 15, 2020 in Glossary by Karen Pacle
Critical Void Ratio The “Critical Void Ratio,” in soil science and geology, represents the final […] Critical Void RatioDecember 15, 2020 in Glossary by Karen Pacle (updated on December 16, 2020)
Degree of Saturation (SR) “Degree of Saturation” (SR) is an engineering geology term and refers […] Degree of Saturation (SR)December 15, 2020 in Glossary by Karen Pacle
Direct Shear Test A Direct Shear Test is a geotechnical engineering laboratory procedure that measures […] Direct Shear TestDecember 14, 2020 in Glossary by Karen Pacle
Dilatancy “Dilatancy” is the increase in the bulk volume of a soil substance during deformation. […] DilatancyDecember 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Gap-Graded The term “Gap-Graded” is used by geologists, engineers, and soil scientists in the geotechnical […] Gap-GradedDecember 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Adsorption “Adsorption” in geology, refers to the attraction and adhesion of the ions or molecules […] AdsorptionDecember 14, 2020 in Glossary by Karen Pacle (updated on January 22, 2021)
Effective Size (D10) “Effective Size” (D10) is an engineering geology term. Effective Size represents a […] Effective Size (D10)December 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Effective Stress (σ’) “Effective Stress” (σ’) is a geotechnical engineering term. Effective Stress is a […] Effective Stress (σ’)December 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Liquefaction Liquefaction: Liquefaction is the process by which there is: (1) a sudden and significant […] LiquefactionDecember 14, 2020 in Glossary by Karen Pacle (updated on June 23, 2021)
Liquid Limit (LL) “Liquid Limit (LL)” in the field of geological engineering, refers to the […] Liquid Limit (LL)December 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Hooke’s Law “Hooke’s Law” is a geological statement relating to the elastic deformation of rocks. […] Hooke’s LawDecember 14, 2020 in Glossary by Karen Pacle
Dry Density (ρd) “Dry Density” (ρd) is a value that represents the density of soil […] Dry Density (ρd)December 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Dry Strength “Dry Strength” is a value that represents the strength of a soil sample, […] Dry StrengthDecember 14, 2020 in Glossary by Karen Pacle (updated on December 14, 2020)
Hardpan (Caliche) “Hardpan” is a highly dense and solid layer of soil near the ground […] Hardpan (Caliche)December 14, 2020 in Glossary by Karen Pacle (updated on December 15, 2020)