Surface wave multipathing ray tracing code published in Hauser et al. (2008). The version available here contains a few improvements among them,

• cmake based build systeml
• CoFI/ESPRESSO friendly python wrappers; and
• an ability to read/write files from outside the current directory

Hauser, J., Sambridge, M. and Rawlinson, N. (2008). Multiarrival wavefront tracking and its applications. Geochem. Geophys. Geosyst., 9(11), Q11001. https://doi.org/10.1029/2008GC002069