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Dynamic Elastography

Electrical Impedance Tomography

Geophysical Fault Identification

Geotechnical Identification

Radar Imaging

Quasi Static Elastography

Geotechnical Identification

Geophysical Imaging of the Subsurface @ RPI
Geophysical imaging is the mapping of various physical parameters such as seismic wavespeed, density, anelasticity, anisotropy, and resistivity as a function of position inside the Earth. Our ability to produce these images has led to important constraints about the dynamics of Earth processes such as faulting and mountain building. RPI faculty and students have been engaged in producing high resolution geophysical images for more than 20 years, this type of investigation is an important component of IPRPI. We are currently involved in a number of projects in different parts of the globe: from the details of fault structure along the San Andreas Fault in California to the mantle processes contributing to the uplift and support of the Tibetan plateau to active continental collision processes in Taiwan, western China, and Kyrgyzstan. Most of our imaging is done through the analysis of seismograms (records of ground motion) to infer the state of the propagating medium. The techniques we use include arrival time tomography, receiver function analysis, and seismic migration.

Imaging the Mantel Beneath the Tein Shan Using Seismograms from Distant Earthquakes
In the Tien Shan of western China and Kyrgyzstan, we are using recording of distant earthquakes to produce images of the upper mantle beneath these unusual mountains to test competing explanations for why there is so much deformation (earthquakes and mountain building) going on more than 100 km away from the collisional front. We install broadband seismometers to record the arriving waves, and then model both the shape and arrival time of the wave to generate images of the subsurface.

Imaging Beneath Western Tibet
The Tibetan plateau is one of the most imposing structures on the surface of the Earth, and has a dramatic effect on the global climate as well and on the tectonics of all of Asia. How did it evolve and what is causing it to maintain an average elevation of 5 km above sea level over an area of about a million square km?

A number of competing hypotheses can be tested using similar techniques to those we are currently employing in the Tien Shan.


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