TY  - JOUR
ID  - epos160
UR  - http://dx.doi.org/10.1111/j.1365-246X.2011.04995.x
IS  - 3
A1  - Zaliapin, Ilya
A1  - Ben-Zion, Yehuda
N2  - We examine the relations between spatial symmetry properties of earthquake patterns along
faults in California (CA) and local velocity structure images to test the hypothesis that ruptures
on bimaterial faults have statistically preferred propagation directions. The analysis employs
seismic catalogues for 25 fault zones in CA. We distinguish between clustered and homoge-
neous parts of each catalogue, using a recently introduced earthquake cluster analysis, and
examine asymmetry of offspring with respect to parent events within the clustered portion of
each catalogue. The results indicate strong asymmetric patterns along large faults with promi-
nent bimaterial interfaces (e.g. sections of the San Andreas Fault), with enhanced activities in
the directions predicted for the local velocity contrasts, and absence of signi?cant asymmetry
along most other faults. Assuming the observed asymmetric properties of seismicity re?ect
the properties of the parent earthquake ruptures, the discussed methodology and results can be
used to develop re?ned estimates of seismic shaking hazard associated with individual fault
zones.
VL  - 185
TI  - Asymmetric distribution of aftershocks on large faults in California
AV  - none
EP  - 1304
Y1  - 2011/06//
PB  - Oxford University Press
JF  - Geophysical Journal International
KW  - Persistence
KW  -  memory
KW  -  correlations
KW  -  clustering; Spatial analysis; Earthquake
dynamics; Earthquake interaction
KW  -  forecasting
KW  -  and prediction; Statistical seismology
SN  - 0956-540X
SP  - 1288
ER  -