Key to crustal structure database


Rec#      lat     Pv    Sv   zlayer  depth     w/o     elev   heat   loc     R/U
          lon     Pv    Sv   zlayer  depth    w/sed    age    azim   ref    prov
                  Pv    Sv   zlayer  depth  moho/other indice

1089     58.13N  5.50  0.00  12.00   0.00     32.00    0.43  90.00  NAC-AL   3 R
        155.00W  6.50  0.00  20.00  12.00     32.00    MCz  999.00   63B.1   Oia 
                 8.10  0.00   0.00  32.00  m


Rec#the record number given this datapoint in the database
latthe latitude of the datapoint
lonthe longitude of the datapoint
Pvthe P-wave velocity of a given layer in the 1-D seismic velocity model for the datapoint
Svthe S-wave velocity for same as above (“0.00” indicates no data entry)
zlayerthe thickness of the layer described by the given P- and S-wave velocities
depththe depth at which the layer described by the given velocities starts
moho/other indice“m” indicates the moho depth
other parameters include “c” crust, “s” sediments, “g” gradient, “l” low-velocity zone. Combinations may also exist for gradients within sedimentary (sg), low velocity (lg), crustal (cg) or mantle (mg) layers. “xm” refers to a mantle layer with an unknown depth. A blank space means the layer is not specifically defined in the source reference.
w/o the crustal thickness at the datapoint without including sediments
w/sed the total crustal thickness (including sediments)
elevthe elevation at the datapoint (if negative then this is the depth of the water)
age the age of the last thermo-tectonic event at the datapoint (if known)
MCz Mesozoic to Cenozoic
Pz Paleozoic
lPt Late Proterozoic
mPt Middle Proterozoic
ePt Early Proterozoic
Ar Archean
heatheat flow at the datapoint (not yet complete!)
azimthe azimuth of the profile from which the 1-D profile was taken (999 indicates multiple directions, 900 indicates unknown)
locthe general location of the datapoint (e.g., NAC-BR = North American Continent, Basin and Range)
available upon request
refthe reference to the literature from which the seismic data was taken
(e.g., 63B.1 = the year in which the article was published (1963), the initial of the last name of the first author of the article (B), and the number indicating which of the references from “63B” this datapoint was taken (1)
available upon request
#(3 shown above) the number of layers in this datapoint
R/Uindicates whether the seismic profile from which the data was taken was reversed refraction (R), unreversed refraction (U), Split (S), Reflection (F), Sonobuoy (B), Tomography (I), Time Term (T), Earthquake Model (E), Receiver Function (C), waveform model (W), Laboratory Measurement (L), unknown (*) or other (O)
prov indicates the geologic province in which the datapoint is situated (if known)
ORO orogen
EXC extended crust
BAS basin
PLT platform
SHD shield
LIP large igneous province