So, i have some questions, they might sound simplistic or fanboyish even, i apologize beforehand for that! I cannot reveal anything more at this point, sorry :D I would need some realistic assesments of a simple rod, launched from low orbit, designed to take out a city or more.... Would need in general some pointers (or links to numbers), best material, terminal velocity, the mass required at that velocity to fulfill the objective. I need it to be better than USAF's vision from 2003 report, which envisioned 6 meter long tungsten rods, 0.3m diameter and Mach 10 terminal velocity, hiting at 0.12kt equivalent. My math skills suck too much to figure out the mass of this rod even though i know all the relevant info for calculating it is given. Furthermore, if this is launched at a coastal city, where water depth is shallow, say 100 meters or less, can it penetrate all the way down to the sea bed, and make an eartquake and a tsunami because of the eartquake? here is where the real problem begins, i can guesstimate with reasonable accuracy when enlarging the idea, leaning on the aforementioned USAF report (link http://www.rand.org/content/dam/rand/pubs/monograph_reports/2011/RAND_MR1209.pdf) , however i am completely clueless as to the energy that would be expended in the tsunami and subsequent eartquake, ie, approximate size of waves, severity of quake on Richter scale, area affected and so forth.... Thanks for any answers.