TY  - JOUR
ID  - epos1519
UR  - http://dx.doi.org/10.1029/97JB00994
IS  - B8
A1  - Eneva, Mariana
A1  - Ben-Zion, Yehuda
Y1  - 1997/08/10/
N2  - A pattern recognition algorithm is developed  to provide potential improvements over 
existing earthquake prediction practices. The parameters  employed  in the analysis  include degree 
of spatial nonrandomness  in two distance  ranges, spatial correlation dimension, spatial 
repetitiveness  of earthquakes with a similar size, average depth of events, time interval for the 
occurrence of a constant number of events, and ratio of the numbers of events in two magnitude 
intervals. The parameter  temporal variations are compared quantitatively with the time series of 
large events using a technique of association  in time. The significance of the association 
frequencies  is evaluated by comparison with chance associations  estimated  from corresponding 
simulated  random time series. The developed  techniques  differ from existing approaches  in the 
following aspects. The parameters  here emphasize  the spatial distribution of earthquakes.  Possible 
correlations  among the parameters  are evaluated  to determine  the final set of parameters  to be 
monitored.  Threshold  values  for  the assumed  anomalies  are chosen with  consideration  of 
properties of the available earthquake  catalogs, such as the number of large events to be 
retrospectively  predicted. Equal weight is given to both locally high and locally low parameter 
values. Care is taken to distinguish  between anomalies preceding  large events and those following 
previous events.  It is shown that the relationship between precursory  local extrema and precursory 
trends is nonunique, with precursory  local extrema of the same type frequently associated with 
opposite observable precursory  trends. The application of the seismicity parameters  and pattern 
recognition  techniques  is demonstrated  using synthetic earthquake  catalogs generated by models 
of segmented  fault systems  in a three-dimensional  elastic solid [Ben-Zion, 1996].
PB  - American Geophysical Union
JF  - Journal of Geophysical Research
VL  - 102
SN  - 0148-0227
TI  - Techniques and parameters to analyze seismicity patterns associated with large earthquakes
SP  - 17785
AV  - none
EP  - 17795
ER  -