iPlex Lunch spring-2015

It has been thought since the 1970s that the Andes lie over a region of thickened crust with a thickening profile roughly proportional to local elevation and a peak Moho offset 30-35km below the IASPI Moho. Recent data from PERUSE has been used in transmission tomography to independently establish the parameters of the crustal thickening under the Peruvian Andes. We have made our own 3D forward ray and inversion models in order to balance between accuracy and speed for this problem. The crustal thickening was modeled using an asymmetric Gaussian basis function. Both local and teleseismic data was used in the inversions. Current results are preliminary and indicate some evidence of a crustal root using local event inversions and teleseismic event forward models. Teleseismic and combined local+teleseismic inversions are pending shortly.