Origin of the Lunar Craters and Maria


IF Dr. van Dorn is right in concluding that the energies of meteor impacts necessary to produce lunar craters of given size are actually about 100 times larger than those postulated by Baldwin, the seismic arguments put forward in my letter of January 17 would be correspondingly strengthened; for the available estimates of the largest energies of terrestrial earthquakes range between 1023 and 1027 ergs, with 1025 ergs as a fair average (Gutenberg, 1958).


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