Read more at: http://phys.org/news/2013-12-earthquake-scars-earth-gravity.html]http://phys.org/news/2013-12-earthquake-scars-earth-gravity.html#jCp
A conjecture, no answer yet(?). Assume two GOCE spacecrafts, their distances to the source of an earthquake were different, d1 and d2. Assume their sensitivity could distinguish the difference before / and after the earthquake. The questions are: at the instant when the earthquake occurs, are the two GOCE detect the change (e.g. after earthquake) of mass distribution at the **same time/instant** ? If not the same time, how long would it take for the information (e.g. the change of distribution of mass at the source of earthquake) to travel from d1 to d2 ? The time it would take to travel from d1 to d2, is this the speed of gravity or gravitational wave ?
@ Zephir_fan. Thx for your support. Science advances very fast. I update knowledge from Physorg, this forum, other sites and forums. Perhaps other peoples/users of this forum too. How one can know the others' mind/thinking (e.g. pretending . . . etc)?