Seismological Society of America

Christian Poppeliers, Predrag Punosevac, and Tammy Bell

Penerbit : Evelyn Ave.,

Tahun : 2013

Abstract Wave gradiometry relates the spatial gradients of a wavefield to its velocity and radiation patterns through two spatial coefficients for any dimension. One coefficient gives the slowness of the wave in any given dimension, and the other coefficient gives the change in amplitude as a function of position and direction along the wavefront. In this paper, we develop the mathematical foundations for scalarwave gradiometry in three dimensions, building on previous work in ID and 2D wave gradiometry. We validate our method by synthetic tests and find that our method can accurately estimate wave direction and speed. Estimating spatial amplitude changes is not as robust, however. Numerical tests indicate that the wave gradiometry method is highly sensitive to uncorrelated noise in the data as well as the presence of interfering waves.

Pengarang