The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas. The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas.
Past earthquakes have shown that the amplification of motions due to surface-to-bedrock geology, 3D crustal structure, and topography have a major influence on seismic damage and loss in urban areas. Also of significant importance are the details of the rupture process on the fault, and the way a built structure is engineered.
These goals will be achieved through investigations of existing data, collection and processing of new ground motion data, and development of numerical and analytical techniques.
As seismic waves produced by an earthquake propagate, they are affected by the earth structure, such as changes in elastic properties resulting in effects such as constructive and destructive interference and basin amplification. Near the ground surface, strong shaking can result in nonlinear soil behavior or raise pore fluid pressure causing liquefaction.
Likewise, the geometry of a man-made structure, the construction materials, the type of ground, and its anchorage in the ground affect its vulnerability to damage during the shaking. This research aims to understand each of these processes and to work with the seismic engineering community to bring the best estimates of strong ground shaking to engineering practice.
Project research activities encompass topics affecting earthquake ground motions and earthquake effects, including, but not limited to, elucidating shallow seismic structure and 3D geologic structure, understanding the effects of the propagation path, source processes, site response, and topography for earthquake ground motions, and evaluating existing ground motion models for use in USGS earthquake hazards products.
The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas. The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas.
Past earthquakes have shown that the amplification of motions due to surface-to-bedrock geology, 3D crustal structure, and topography have a major influence on seismic damage and loss in urban areas. Also of significant importance are the details of the rupture process on the fault, and the way a built structure is engineered.
These goals will be achieved through investigations of existing data, collection and processing of new ground motion data, and development of numerical and analytical techniques.
As seismic waves produced by an earthquake propagate, they are affected by the earth structure, such as changes in elastic properties resulting in effects such as constructive and destructive interference and basin amplification. Near the ground surface, strong shaking can result in nonlinear soil behavior or raise pore fluid pressure causing liquefaction.
Likewise, the geometry of a man-made structure, the construction materials, the type of ground, and its anchorage in the ground affect its vulnerability to damage during the shaking. This research aims to understand each of these processes and to work with the seismic engineering community to bring the best estimates of strong ground shaking to engineering practice.
Project research activities encompass topics affecting earthquake ground motions and earthquake effects, including, but not limited to, elucidating shallow seismic structure and 3D geologic structure, understanding the effects of the propagation path, source processes, site response, and topography for earthquake ground motions, and evaluating existing ground motion models for use in USGS earthquake hazards products.