No description.
Images
Earthquake Hazards Program images.
Filter Total Items: 574
Ground Photo of Fault
Ground Photo of Fault
No description.
Ground Photo of Fault
No description.
Spectral Accelerations (Youngs et al., 1997)
Predicted Spectral Accelerations by the Youngs et al. (1997) Attenuation Relationship
Predicted Spectral Accelerations by the Youngs et al. (1997) Attenuation Relationship
Oceanic Spreading
An oceanic spreading ridge is the fracture zone along the ocean bottom where molten mantle material comes to the surface, thus creating new crust. This fracture can be seen beneath the ocean as a line of ridges that form as molten rock reaches the ocean bottom and solidifies.
An oceanic spreading ridge is the fracture zone along the ocean bottom where molten mantle material comes to the surface, thus creating new crust. This fracture can be seen beneath the ocean as a line of ridges that form as molten rock reaches the ocean bottom and solidifies.
Ring of Fire
The "Ring of Fire", also called the Circum-Pacific belt, is the zone of earthquakes surrounding the Pacific Ocean- about 90% of the world's earthquakes occur there. The next most seismic region (5-6% of earthquakes) is the Alpide belt (extends from Mediterranean region, eastward through Turkey, Iran, and northern India.
The "Ring of Fire", also called the Circum-Pacific belt, is the zone of earthquakes surrounding the Pacific Ocean- about 90% of the world's earthquakes occur there. The next most seismic region (5-6% of earthquakes) is the Alpide belt (extends from Mediterranean region, eastward through Turkey, Iran, and northern India.
Seismicity of the United States 1975-1995
Seismicity of the United States 1975-1995. Seismicity refers to the geographic and historical distribution of earthquakes.
Seismicity of the United States 1975-1995. Seismicity refers to the geographic and historical distribution of earthquakes.
ShakeMap Directivity Map
This ShakeMap of the January 17, 1994 M6.7 Northridge earthquake shaking shows the result of rupture directivity toward the north.
This ShakeMap of the January 17, 1994 M6.7 Northridge earthquake shaking shows the result of rupture directivity toward the north.
Northridge, CA Earthquake Damage
Collection of USGS still images taken after the January 17, 1994 Northridge earthquake highlighting the damage to buildings and infrastructure.
Collection of USGS still images taken after the January 17, 1994 Northridge earthquake highlighting the damage to buildings and infrastructure.
Active Emerson Fault
The Emerson fault, one of the segments that ruptured in the M7.2 1992 Landers, Calfornia earthquake.
The Emerson fault, one of the segments that ruptured in the M7.2 1992 Landers, Calfornia earthquake.
1992 M7.2 Landers, California Earthquake Slip Model
1992 M7.2 Landers, California Earthquake Slip Model1992 M7.2 Landers, California earthquake slip model
A slip model is a kinematic model that describes the amount, distribution, and timing of slip associated with an earthquake.
1992 M7.2 Landers, California Earthquake Slip Model
1992 M7.2 Landers, California Earthquake Slip Model1992 M7.2 Landers, California earthquake slip model
A slip model is a kinematic model that describes the amount, distribution, and timing of slip associated with an earthquake.
Loma Prieta earthquake, Marina District
An automobile lies crushed under the third story of this apartment building in the Marina District. The ground levels are no longer visible because of structural failure and sinking due to liquefaction.
An automobile lies crushed under the third story of this apartment building in the Marina District. The ground levels are no longer visible because of structural failure and sinking due to liquefaction.
Cross-Sections of Seismicity Along the San Andreas Fault
Cross-Sections of Seismicity Along the San Andreas FaultCross-Sections of Seismicity Along the San Andreas Fault from "Lessons learned from the Loma Prieta, California, earthquake of October 17, 1989"
Cross-Sections of Seismicity Along the San Andreas Fault
Cross-Sections of Seismicity Along the San Andreas FaultCross-Sections of Seismicity Along the San Andreas Fault from "Lessons learned from the Loma Prieta, California, earthquake of October 17, 1989"
Damaged Building
A downtown building at the corner of Alice and 13th Streets lost part of its unreinforced facade and brick masonry.
A downtown building at the corner of Alice and 13th Streets lost part of its unreinforced facade and brick masonry.
Segmentation of the San Andreas Fault
The segments of the San Andreas Fault, and the probability for strong shaking in the next 30 years on each segment.
The segments of the San Andreas Fault, and the probability for strong shaking in the next 30 years on each segment.
San Andreas Fault in SE Coachella Valley
Oblique aerial view of San Andreas Fault (between white arrows) in southeastern Coachella Valley, near Red Canyon; view to the west.
Oblique aerial view of San Andreas Fault (between white arrows) in southeastern Coachella Valley, near Red Canyon; view to the west.
Harmonic Tremor
During the first week of April a different type of seismic signature was showing up on seismograms from Mount St. Helens. On April 1 the first weak harmonic tremor was detected. Stronger bursts of harmonic tremor were recorded on the 2nd. The seismogram above is an example of harmonic tremor recorded at seismic station RAN on April 2.
During the first week of April a different type of seismic signature was showing up on seismograms from Mount St. Helens. On April 1 the first weak harmonic tremor was detected. Stronger bursts of harmonic tremor were recorded on the 2nd. The seismogram above is an example of harmonic tremor recorded at seismic station RAN on April 2.
Moment Tensor
The nine generalized couples of the seismic moment tensor. Modified after Aki and Richards (1980).
The nine generalized couples of the seismic moment tensor. Modified after Aki and Richards (1980).
Charles Richter
Charles Richter, inventor of the Richter Scale.
Seismology is the study of earthquakes and the structure of the earth, by both naturally and artificially generated seismic waves.
Charles Richter, inventor of the Richter Scale.
Seismology is the study of earthquakes and the structure of the earth, by both naturally and artificially generated seismic waves.
Deformation Example - Deformed Rock
Photo of deformed rock. Deformation is a change in the original shape of a material. When we are talking about earthquakes, deformation is due to stress and strain.
Photo of deformed rock. Deformation is a change in the original shape of a material. When we are talking about earthquakes, deformation is due to stress and strain.
Richter Scale
The Richter magnitude scale was developed in 1935 by Charles F. Richter of the California Institute of Technology as a mathematical device to compare the size of earthquakes. The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.
The Richter magnitude scale was developed in 1935 by Charles F. Richter of the California Institute of Technology as a mathematical device to compare the size of earthquakes. The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs.