The strike is the trend or bearing, relative to north, of the line defined by the intersection of a planar geologic surface (for example, a fault or a bed) and a horizontal surface such as the ground.
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Strike
The strike is the trend or bearing, relative to north, of the line defined by the intersection of a planar geologic surface (for example, a fault or a bed) and a horizontal surface such as the ground.
Los Gatos Residence Damage
This turn-of-the-century wooden residence in Los Gatos sustained major damage when it moved off its foundation during the October 17, 1989, M7.1 Loma Prieta, California earthquake.
This turn-of-the-century wooden residence in Los Gatos sustained major damage when it moved off its foundation during the October 17, 1989, M7.1 Loma Prieta, California earthquake.
Subduction Zone
Subduction zone of the Juan de Fuca Plate and North America Plate, creating the Mt. St. Helens and Mt. Hood volcanoes.
Subduction zone of the Juan de Fuca Plate and North America Plate, creating the Mt. St. Helens and Mt. Hood volcanoes.
Surface Waves
A surface wave is a seismic seismic wave that is trapped near the surface of the earth.
A surface wave is a seismic seismic wave that is trapped near the surface of the earth.
Sand Boil
A sand boil is sand and water that come out onto the ground surface during an earthquake as a result of liquefaction at shallow depth.
A sand boil is sand and water that come out onto the ground surface during an earthquake as a result of liquefaction at shallow depth.
Secular Mountains
Secular refers to long-term changes that take place slowly and imperceptibly. Commonly used to describe changes in elevation, tilt, and stress or strain rates that are related to long-term tectonic deformation.
Secular refers to long-term changes that take place slowly and imperceptibly. Commonly used to describe changes in elevation, tilt, and stress or strain rates that are related to long-term tectonic deformation.
Seiche in Lake Geneva, Switzerland
Seiche in Lake Geneva (Switzerland)
A seiche is the sloshing of a closed body of water from earthquake shaking. Swimming pools often have seiches during earthquakes.
Seiche in Lake Geneva (Switzerland)
A seiche is the sloshing of a closed body of water from earthquake shaking. Swimming pools often have seiches during earthquakes.
Seismogenic Zone
Moment = ? A D
? = shear modulus = 32 GPa in crust, 75 GPa in mantle
A = LW = area
D = average displacement during rupture
Moment = ? A D
? = shear modulus = 32 GPa in crust, 75 GPa in mantle
A = LW = area
D = average displacement during rupture
New Madrid Seismic Zone
The New Madrid seismic zone in Central U.S.
A seismic zone is an area of seismicity probably sharing a common cause.
The New Madrid seismic zone in Central U.S.
A seismic zone is an area of seismicity probably sharing a common cause.
Seismic Waves
A seismogram is a record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.
A seismogram is a record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.
Shadow Zone
The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Descending Slab
A slab is the oceanic crustal plate that underthrusts the continental plate in a subduction zone and is consumed by the earth's mantle.
A slab is the oceanic crustal plate that underthrusts the continental plate in a subduction zone and is consumed by the earth's mantle.
Slickensides
Slickensides are polished striated rock surfaces caused by one rock mass moving across another on a fault.
Slickensides are polished striated rock surfaces caused by one rock mass moving across another on a fault.
Teleseismic
Teleseismic is pertaining to earthquakes at distances greater than 1,000 km from the measurement site.
Teleseismic is pertaining to earthquakes at distances greater than 1,000 km from the measurement site.
Time History
The time history is the sequence of values of any time-varying quantity (such as a ground motion measurement) measured at a set of fixed times. Also termed time series.
The time history is the sequence of values of any time-varying quantity (such as a ground motion measurement) measured at a set of fixed times. Also termed time series.
Transform Fault
A transform fault is a special variety of strike-slip fault that accommodates relative horizontal slip between other tectonic elements, such as oceanic crustal plates. Often extend from oceanic ridges.
A transform fault is a special variety of strike-slip fault that accommodates relative horizontal slip between other tectonic elements, such as oceanic crustal plates. Often extend from oceanic ridges.
Slip Rate Map
The slip rate is how fast the two sides of a fault are slipping relative to one another, as determined from geodetic measurements, from offset man-made structures, or from offset geologic features whose age can be estimated. It is measured parallel to the predominant slip direction or estimated from the vertical or horizontal offset of geologic markers.
The slip rate is how fast the two sides of a fault are slipping relative to one another, as determined from geodetic measurements, from offset man-made structures, or from offset geologic features whose age can be estimated. It is measured parallel to the predominant slip direction or estimated from the vertical or horizontal offset of geologic markers.
Soil Profile in Hills of Manisa Province, Turkey
Soil profile in hills of Manisa Province, Turkey, showing a distinct horizon of accumulated red-purple metallic (manganese and/or iron?) oxides.
Soil profile in hills of Manisa Province, Turkey, showing a distinct horizon of accumulated red-purple metallic (manganese and/or iron?) oxides.
Earthquake Source Diagram
The source is the term for the released forces that generate acoustic or seismic waves, also called the earthquake source.
The source is the term for the released forces that generate acoustic or seismic waves, also called the earthquake source.
P Waves
A P wave, or compressional wave, is a seismic body wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving.
A P wave, or compressional wave, is a seismic body wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving.
Person Looking at Valley
Person sitting and overlooking valley of snow-topped mountains with clouds in between mountains
Person sitting and overlooking valley of snow-topped mountains with clouds in between mountains