Geologic and Tectonic Setting: Difference between revisions

Latest revision as of 23:52, 14 December 2022

A seismic hazard assessment requires an evaluation of the following aspects of geologic and tectonic setting:

Examples

California Institute of Technology - Tectonics Observatory at Caltech

International Association of Seismology and Physics of the Earth's Interior (IASPEI)

Citations:

Revision ID: 5766
Revision Date: 12/14/2022

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-A [[seismic]] hazard assessment should include an evaluation of the global geologic setting. Understanding the behavior and properties of the Earth's surface and underlying layers sets the stage for interpreting the local geologic setting.
+A [[seismic]] hazard assessment requires an evaluation of the following aspects of geologic and tectonic setting:
+*[[Global Geologic Setting and Plate Tectonics]]
-Global tectonics is the theory that the earth’s relatively low density crust (lithosphere) is composed of seven or eight major and several smaller rigid fragments. These tectonic plates, both continental and oceanic forms of the crust, move [[about]] the earth’s face, driven by convective activity within the higher density and relatively plastic mantle (asthenosphere).
+*[[Local Geologic Setting]]
+*[[Local Tectonic Setting]]
-Plates interact at convergent (collisional), divergent (spreading), and transform (lateral) boundaries. Mountains rise and the sea floor is subducted in deep trenches along collisional boundaries, continents and oceans rift and open along spreading center boundaries, while continental and oceanic crust moves laterally along transform boundaries. Earthquakes and volcanic activity occur in association with these plate margins.
+*[[Velocity Structure]]
-Research into regional tectonic conditions should be conducted at the beginning of an SHA to establish the regional seismic framework. It is important to obtain the most recent publications, as the science is dynamic and new information becomes available frequently. Information regarding the global geologic and plate tectonic setting can be obtained from governmental geological agencies for countries of the region. The U.S. Geological [[Survey]] (USGS) is a good starting point for any location.
-* [[Local Geologic Setting]]
-* [[Local Tectonic Setting]]
-* [[Velocity Structure]]
 ==Examples==