On the Stability of Mantle-Sensitive P-wave Interference during a Secondary Microseismic Event.

Body wave extraction from oceanic secondary microseismic sources with seismic interferometry provides alternative information to better constrain the Earth's structure. However, sources' spatio-temporal variations raise concerns about travel time measurement robustness. Therefore, we study the cross-correlations' stability during a single oceanic event. In this study, we focus on three days of data and three seismic arrays' combinations between 8-11 December 2014 during storm Alexandra, a "weather bomb" event in southern Greenland. We use the WAVEWATCH III hindcast to model P-wave noise sources and assess the impact of short-term source variations on cross-correlations. Model-based cross-correlations compared to data show coherent delays to reference 3D Earth models (~ 0-3s) confirming the robustness of the source model which could explain minor travel time variations (< 1 s).