By analyzing theglobal variation of differential times between these two phases, Wang et al. [2015] proposed a distinct seismic anisotropy in the innermost inner core of ~600 km radius with a fast axis near the equatorial plane throughCentral America and Southeast Asia. The PKIKP2-PKIIKP2 phase pair samples the entire inner core (not just theOIC) and therefore has great potential to complement earthquake generated body wave methods.In this study we apply earthquake coda interferometry techniques [Lin et al., 2013; Lin and Tsai, 2013; Wanget al., 2015] to 1846 USArray stations deployed across North America from January 2004 throughSeptember 2013 (Figure 1b) to extract differential travel times of PKIKP2 and PKIIKP2. Its dense stationspacing, high quality recordings (e.g., uniform instrumentation), and especially its wide aperture makeUSArray an ideal network to probe the deep Earth with seismic interferometry. Its location straddling arecently proposed inner core hemisphere boundary at 95°W [Lythgoe et al., 2014] also provides a goodopportunity to evaluate that model.Although most USArray stations were operational for just 18–24 months, we demonstrate that reliable PKIKP2and PKIIKP2 signals can be extracted at most stations and used to derive high-resolution maps of travel timeresiduals. We then validate the observed short-wavelength variations and discuss the implications forstructure in the deep Earth.