From a Wiki page[1]:<p><i>The location of the Deccan Traps, for example, would have been close to the antipodal point of Chicxulub in the late Cretaceous; a sufficiently large asteroid impact might have sent shock waves around the planet sufficient to trigger an effect on weakened crust on the other side of the globe.</i><p>A while ago IIRC I read in a Scientific American article that it took some 800,000 years from the Chicxulub impactor to the Deccan Traps. Some of these things take a <i>long time</i>!<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Kt_boundary#Multiple_causes" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Kt_boundary#Multiple_causes</a>