Question

mitigation of earthquakes

Answer 1

hey frnds...
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"Earthquake Hazards Mitigation. Here on the Big Island, we feel small earthquakes on a regular basis, and magma movement underground that precedes eruptive activity produces low-level tremor.".....




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Answer 2

Seismic migration is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface. This process is necessary to overcome the limitations of geophysical methods imposed by areas of complex geology, such as: faults, salt bodies, folding, etc.[1][2][3]

Migration moves dipping reflectors to their true subsurface positions and collapses diffractions,[4] resulting in a migrated image that typically has an increased spatial resolution and resolves areas of complex geology much better than non-migrated images. A form of migration is one of the standard data processing techniques for reflection-based geophysical methods (seismic reflection and ground-penetrating radar)

The need for migration has been understood since the beginnings of seismic exploration and the very first seismic reflection data from 1921 were migrated.[5] Computational migration algorithms have been around for many years but they have only entered wide usage in the past 20 years because they are extremely resource-intensive. Migration can lead to a dramatic uplift in image quality so algorithms are the subject of intense research, both within the geophysical industry as well as academic circles.

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