Rawlinson, NicholasSambridge, MalcolmHauser, Jurg2015-12-080956-540Xhttp://hdl.handle.net/1885/32454A new theory for the calculation of later seismic arrivals in heterogeneous media is presented. We introduce the concept of a 'raylet', which is a segment of a later arriving ray path between source and receiver defined by joint properties of forward andKeywords: arrival time; heterogeneous medium; numerical model; seismic wave; seismology; theoretical study; travel time; wave propagation Computational seismology; Numerical solutions; Theoretical seismology; Wave propagation201010.1111/j.1365-246X.2010.04558.x2016-02-24