Surface Waves

We have automatically measured phase dispersion and arrival angles on seismograms from a database of over 100,000 digital records. The measurements are in the range 32s to 150s. This data set is inverted for global laterally heterogeneous phase velocity structure. We have developed theory for interpreting the measurements in terms of anisotropic phase velocity.

2011 Update: Global Dispersion Model GDM52

We have extended the 1997 Ekström, Tromp, and Larson study to shorter and longer periods, and including azimuthal anisotropy. The results are published in the Global Dispersion Model GDM52.

Some earlier results and links