Seismic anisotropy provides crucial information on the stress state and geodynamic processes inside Earth. We develop a novel adjoint-state traveltime tomography method using P-wave data to simultaneously determine velocity heterogeneity azimuthal of subsurface. First, an anisotropic eikonal equation is derived model first-arrival traveltimes in azimuthally media. Traveltime then formulated as ...

Location of earthquakes is a primary task in seismology and microseismic monitoring, essential for almost any further analysis. Earthquake hypocenters can be determined by the inversion arrival times seismic waves observed at stations, which non-linear inverse problem. Growing amounts data real-time processing requirements imply use robust machine learning applications characterization seismici...

We have developed a method to automatically relate events between observed and synthetic data for wave-equation traveltime (WT) inversion. The scheme starts with local similarity measurements by applying crosscorrelation localized traces. then develop differentiable alternative the argmax function. By each time slice of map, we build difference function but keep this process differentiable. WT ...