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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.
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.
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.
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.
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Earthquake or seismic performance defines a structure's ability to sustain its main functions, such as its safety and serviceability, at and after a particular earthquake exposure. A structure is normally considered safe if it does not endanger the lives and well-being of those in or around it by partially or completely collapsing.