This is the amount of the seafloor with 5-20 mGal anomalies (after detrending). You can see there's one huge spike - more than twice the next highest - and its right at KPg.
Seafloor gravity anomalies dated to the chicxulub impact
Some prior studies suggested that the Chicxulub impact may have triggered volcanism in the Deccan Traps. But, if it can trigger magmatism there, why not everywhere? We found a concentration of K-Pg aged positive gravity anomalies that, as you can see, is unprecedented at any other age. Our answer is, yes, maybe the impact could trigger eruptions everywhere.
Publication and press
The paper is here. This got some press attention due to the connection to dinosaurs, and an article we helped write is here. Some other articles are here, here, and here (the last has audio with Leif, not me); many more are out on the internet with variable quality. Below is a video that Science made illustrating the story.