Open AccessDistinguishing between random and nonrandom patterns in the energy release of great earthquakes
Author(s) -
Johnson Stephen M.,
Sheridan Judith M.
Publication year - 1997
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/96jb03552
Subject(s) - slip (aerodynamics) , seismology , geology , historical record , history , physics , memoir , thermodynamics , art history
Romanowicz [1993] suggested that great earthquakes alternate in a predictable fashion between strike‐slip and dip‐slip mechanisms on a 20–30 year cycle. We investigate whether or not the observed pattern of shifting predominance between strike slip and dip slip is capable of frequent reproduction by random simulation. To accomplish this, we randomly drew strike‐slip and dip‐slip events in the same proportion as in the historic record and determined how frequently a pattern of predominance similar to the historic record is generated. Out of 1000 simulations a pattern similar to the historic record was observed 183 times. This throws considerable doubt on Romanowicz's [1993] conslusion that a mechanism is at work producing the distribution she observed of great earthquakes. The difficulty in coming to conclusions from data of the type used by Romanowicz [1993] is explored, along with the psychological literature on the difficulty of detecting random and nonrandom patterns from relatively small amounts of information.