Teleseismic traveltime tomography Running Head global heterogeneous model
Teleseismic traveltime tomography is an important tool to study the structure of the Earth s interior.In teleseismic traveltime tomography,a one-dimensional reference model is usually employed to compute seismic rays outside the study domain.Owing to the existence of widely spread heterogeneities inside the Earth,the impacts from global heterogeneities are not taken into count in conventional teleseismic tomography.Therefore,tomographic images inside the study area are affected by heterogeneities outside.In order to reduce the impacts,we use upwind schemes to numerically solve the eikonal equation and obtain seismic rays in a heterogeneous global model.Based on the solved seismic rays in the heterogeneous global model,we conduct teleseismic traveltime tomographic study.To demonstrate the effectiveness of the tomography method in improving imaging accuracy,we select the northeastern Tibetan Plateau for synthetic and practical tomographic studies.Tomographic results show that the imaging accuracy is increased and more imaging details are presented when conducting teleseismic traveltime tomography based on a heterogeneous global model.
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