the questions: (1) How will the close passage of Comet Elenin and Earth cause geologic catastrophes on March 15 and (2) How will the so-called "Supermoon", a full moon when the moon is closest to Earth in its orbit, cause geologic catastrophes? I know there has long been a desire to show about the gravitational resonance of planets/comets/asteroids/the sun might play a role in Earth's geologic activity - and with some logic. We see the interaction of the Earth's surface with the Moon's gravity (and to some extent the Sun's) with the tides in the oceans. Water has low viscosity so the tidal tugging of the moon as it rotates around the Earth sloshes the oceans back and forth to create our tides. One could imagine that the Earth's crust/mantle/core might feel some of that gravitational interaction as well - and they do. John Vidale, a seismologist at the University of Washington, mentions that during full and new moons - when the moon is oriented between or opposite the Earth and the sun - there is potentially as much as a 1% increase in earthquake activity worldwide (and a slightly higher effect on volcanic activity).