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Her graduate research centered on the propagation of cracks [4] and she developed a numerical model of earthquakes that enabled the prediction of aftershocks after an earthquake. [5] While at Lamont Doherty Earth Observatory, Das worked on the relevance of the source point for an earthquake with respect to the scale of an earthquake. [6]
In geology, the elastic-rebound theory is an explanation for how energy is released during an earthquake. As the Earth's crust deforms, the rocks which span the opposing sides of a fault are subjected to shear stress. Slowly they deform, until their internal rigidity is exceeded.
In 1935 he was appointed Professor of Structural Engineering, a post which he held for almost 30 years, developing and teaching the principles of earthquake-resistant design. Among his best known contributions was the development of a simple but accurate method for routine structural analysis of a moment resisting frame under lateral loading.
The focal mechanism of an earthquake describes the deformation in the source region that generates the seismic waves.In the case of a fault-related event, it refers to the orientation of the fault plane that slipped, and the slip vector and is also known as a fault-plane solution.
Seismic refraction traverses (seismic lines) are performed using an array of seismographs or geophones and an energy source. The methods depend on the fact that seismic waves have differing velocities in different types of soil or rock. The waves are refracted when they cross the boundary between different types (or conditions) of soil or rock.
There is some variation of b-values in the approximate range of 0.5 to 2 depending on the source environment of the region. [5] A notable example of this is during earthquake swarms when b can become as high as 2.5, thus indicating a very high proportion of small earthquakes to large ones.
Types of faulting. Anderson's theory of faulting, devised by Ernest Masson Anderson in 1905, is a way of classifying geological faults by use of principal stress. [1] [2] A fault is a fracture in the surface of the Earth that occurs when rocks break under extreme stress. [3]
A seismic metamaterial, is a metamaterial that is designed to counteract the adverse effects of seismic waves on artificial structures, which exist on or near the surface of the Earth.