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1 Department of Earth and Space
Sciences
University of California
Los Angeles, California
90095-1567
pbird{at}ess.ucla.edu
ykagan{at}ucla.edu
A new plate model is used to analyze the mean seismicities of seven types of
plate boundary (CRB, continental rift boundary; CTF,
continental transform fault; CCB, continental convergent boundary;
OSR, oceanic spreading ridge; OTF, oceanic transform
fault; OCB, oceanic convergent boundary; SUB, subduction
zone). We compare the platelike (nonorogen) regions of model PB2002
(Bird, 2003) with the centroid moment tensor (CMT) catalog to select apparent
boundary half-widths and then assign 95% of shallow earthquakes to one of these
settings. A tapered Gutenberg-Richter model of the frequency/moment relation is
fit to the subcatalog for each setting by maximum likelihood. Best-fitting
ß values range from 0.53 to 0.92, but all 95% confidence ranges
are consistent with a common value of 0.61–0.66. To better determine some
corner magnitudes we expand the subcatalogs by (1) inclusion of orogens and (2)
inclusion of years 1900–1975 from the catalog of
Pacheco and Sykes
(1992). Combining both earthquake statistics and the plate-tectonic
constraint on moment rate, corner magnitudes include the following:
CRB, 
;
CTF, 
;
CCB, 
;
OCB, 
;
and SUB,
. Coupled
lithosphere thicknesses are found to be the following: CRB,
; CTF,
; CCB,
; OSR,
for normal faulting
and 
for strike
slip; OTF,
, and
at low, medium, and
high velocities; OCB,
; and
SUB, 
. In
general, high coupling of subduction and continental plate boundaries suggests
that here all seismic gaps are dangerous unless proven to be creeping. In
general, low coupling within oceanic lithosphere suggests a different model of
isolated seismic fault patches surrounded by large seismic gaps that may be
permanent.
Online Material: Global seismic subcatalogs of shallow earthquakes.
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