From the crust to the core
For about 10 years, ambient seismic field tomography relied on the computation of the Green’s function between synchronous pairs of stations. Recently, we showed the feasibility of significantly enhancing the resolution of surface wave tomography by bridging asynchronous seismic networks through higher-order correlations Paper. Having the power to bridge asynchronous networks is an important step for our community. Every single station ever installed can now be used as a potential virtual source to be recorded with the entirety of the seismic capabilities. This study, which we applied to Mexico and the southern US, allowed me to analyze body waves that sample the core-mantle boundary Paper.
The ability to extract core phases’ travel-time between every possible station pair gives global seismologists a new level of control in obtaining the necessary sampling geometries to test hypotheses regarding deep Earth structure.
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