Deep structure of the Racha earthquake source zone from seismic tomography data

  title={Deep structure of the Racha earthquake source zone from seismic tomography data},
  author={S. S. Arefiev and Eugene A. Rogozhin and Vera Bykova and Catherine Dorbath},
  journal={Izvestiya, Physics of the Solid Earth},
The Racha earthquake of 1991 was the strongest of the earthquakes recorded in the Caucasus. It was studied by an international epicentral expedition. Unique data gathered by this expedition included records of aftershocks whose swarm was very intense. A 3-D velocity model is obtained from analysis of these data by the method of local earthquake tomography. The ancient crystalline basement and the sedimentary-volcanic Mesozoic-Cenozoic cover could be identified from cross sections of the P wave… 

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I and i

There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.

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A and V