For each of the 7 classes of plate boundary (generically XXX, where XXX = CCB, CRB, CTF, OCB, OSR, OTF, SUB; abbreviations expanded below) we make available 2 computer files:
CMT_PB2002_XXX_pure.eqc is the corresponding subcatalog (above threshold) for the non-orogen parts of Earth's surface, as defined by Bird (2003). Each subcatalog is in the .eqc file format defined in the electronic attachments to Bird & Kagan (2004); it is a plain-ASCII flat-file database (headerless table) structure. Note that the code (EQ_classification_II.f90) used to divide the CMT catalog into 7 subcatalogs was previously published by Bird & Kagan (2004).
CMT_PB2002_CCB_pure.eqc
{Continental Convergent Boundaries}
CMT_PB2002_CRB_pure.eqc
{Continental Rift Boundaries}
CMT_PB2002_CTF_pure.eqc
{Continental Transform Faults}
CMT_PB2002_OCB_pure.eqc
{Oceanic Convergent Boundaries}
CMT_PB2002_OSR_pure.eqc
{Oceanic Spreading Ridges}
CMT_PB2002_OTF_pure.eqc
{Oceanic Transform Faults}
CMT_PB2002_SUB_pure.eqc
{Subduction zones}
PB2002_XXX_pure_independent_CMT.txt is a tab-delimited headerless table listing plate boundary steps of one class (outside orogen regions) in order by relative plate velocity, and showing the summations of model tectonic moment rate, independent earthquake count, and independent seismic moment sum that we display in Figures 1-7. The number of rows depends on the number of plate boundary steps of that class (outside of orogen regions) in the global plate model PB2002 of Bird (2003). The column definitions are the same in all 7 tables, as listed below. Note that the format and content of columns C1-C18 is based on the format of file PB2002_steps.dat which was published by Bird (2003) and explicitly defined in Table 2 of that paper.
C1 = sequence number of plate boundary step in file PB2002_steps.dat of Bird (2003).
C2 = continuity marker (':' or blank) in original source file; not meaningful in this table.
C3 = 5-character plate-boundary identifier; central character '/' or '\' indicates subduction; all other boundaries are '-'.
C4 = East longitude of initial point of plate boundary step.
C5 = North latitude of initial point of plate boundary step.
C6 = East longitude of final point of plate boundary step.
C7 = North latitude of final point of plate boundary step.
C8 = length of plate boundary step, in km.
C9 = azimuth of plate boundary step, in degrees clockwise from North.
C10 = relative plate velocity (in horizontal plane) in units of mm/year.
C11 = azimuth of relative plate velocity vector, in degrees clockwise from North.
C12 = divergent component of relative plate velocity (convergence is negative), in mm/year.
C13 = right-lateral component of relative plate velocity (sinistral is negative), in mm/year.
C14 = elevation (bathymetry is negative) at midpoint of step, in m.
C15 = age of seafloor at midpoint of step (if known), in Ma; values >180 are unknown or continental.
C16 = continuity indicator (':' or blank); not meaningful in this table.
C17 = 3-letter code for class of plate boundary; should be uniform within each file.
C18 = '*' if midpoint of step is within any orogen, otherwise blank; should be blank in these tables.
C19 = count of independent earthquakes associated with step; not necessarily an integer; see text of paper.
C20 = sum of independent seismic moments associated with step; see text of paper.
C21 = relative model tectonic moment rate of the step, based on equation (11) of Bird & Kagan (2004), but omitting shear-modulus and coupled-thickness terms.
C22 = integral of previous column C21.
C23 = values from column C22, expressed as fraction of largest value in last row of C22.
C24 = integral of column C19.
C25 = values from column C24, expressed as fraction of largest value in last row of C24.
C26 = integral of column C20.
C27 = values from column C26, expressed as fraction of largest value in last row of C26.
C28 = absolute value of difference between C23 and C25.
C29 = mean of squares of C28 (this row) and C28 (previous row), times increment in C23 (this row) relative to previous row.
Note that the maximum value in C28 is the Kolmogorov/Smirnov statistic for the null hypothesis.
Note that the square-root of the sum of the values in C29 is the Cramer/Von Mises statistic for the null hypothesis.
PB2002_CCB_pure_independent_CMT.txt
{Continental Convergent Boundaries}
PB2002_CRB_pure_independent_CMT.txt
{Continental Rift Boundaries}
PB2002_CTF_pure_independent_CMT.txt
{Continental Transform Faults}
PB2002_OCB_pure_independent_CMT.txt
{Oceanic Convergent Boundaries}
PB2002_OSR_pure_independent_CMT.txt
{Oceanic Spreading Ridges}
PB2002_OTF_pure_independent_CMT.txt
{Oceanic Transform Faults}
PB2002_SUB_pure_independent_CMT.txt
{Subduction zones}
Bird, P. (2003) An updated digital model of plate boundaries, Geochemistry Geophysics Geosystems, 4(3), 1027, doi:10.1029/2001GC000252.
Bird, P., and Y. Y. Kagan (2004) Plate-tectonic analysis of shallow seismicity: Apparent boundary width, beta, corner magnitude, coupled lithosphere thickness, and coupling in seven tectonic settings, Bull. Seismol. Soc. Am., 94(6), 2380-2399, doi:10.1785/0120030107, plus electronic supplement.