CCREM: New Reference Earth Model From the Global Coda?Correlation Wavefield

The existing reference Earth models have provided an excellent one-dimensional representation of Earth's properties as a function its radius and explained many seismic observations in broad frequency band. However, some discrepancies still exist among these near the first-order discontinuities (e.g., core-mantle inner-core boundaries) due to different data sets approaches. As new paradigm global seismology, analysis coda-correlation wavefield is fundamentally from interpreting direct phases or free oscillations Earth. correlation features correlograms similarity body waves reverberating through interior. such, there great potential utilize information stored constraining internal structure. Here, we deploy earthquake-coda independent source 15–50 s period interval increase radial structure constraints. We assemble set multiple pronounced fit both their travel times waveforms by computing synthetic series candidate models. Misfit measurements for are then computed search best-fitting model. model that provides optimal CCREM. It displays differences velocities, especially discontinuities, relative previously proposed Earth-reference This first application whole velocity