Fig. 10From: Upper mantle structure beneath the Society hotspot and surrounding region using broadband data from ocean floor and islandsResults of spike tests for phase velocity distributions. We performed spike tests on a two-dimensional phase velocity map at a period of 80 s. a Input model whose slow anomalies are located on the Society and Arago hotspots. b Output model from (a). c Same as (a) but a slow anomaly is located only beneath Tahiti island. d Output model from c Back to article page