Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Paleoliquefaction surveys between 1990 and 1994

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Description Note: this cover is a combination of liq94surv and liqmunsurv. The northern part of the map area and large adjacent regions have been severely shaken by one or more moderate to large prehistoric earthquakes. The evidence of these takes the form of paleoli
Originators Rhea, Susan
Publication U.S. Geological Survey Open-File Report 97-0681

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Overview of attributes

Sample Number:  A unique number assigned to a sample regardless ot sample type
Slug number:  Core segment identification
Depth to top of slug (meters)
Depth interval relative to top of slug (cm)
Depth in hole (meters)
Grain Size Percent > 3.2 um
Declination (deg.) Linear fit
Inclination (deg.) Linear fit
Magnetization removed in demagnetization interval A/m
Demagnetization interval used for linear fit (mT)
No. Pts. used in linear fit
Error Angle
Subjective quality of demagnetization path (A=best C=worst)
MS vol-SI: (low freq.) Magnetic susceptibility measured at about 600 Hz
FD of MS %: frequency of dependence of magnetic susceptibility
NRM A/m: magnitude of natural remanent magnetization
ARM A/m: magnitude of anhysteretic remanent magnetization
IRM 1.2T A/m: Isothermal remanent magnetization acquired in an induction
of 1.2T
IRM -0.3T A/m: Isothermal remanent magnetization after exposure to an
induction of 1.2T followed by exposure to an oppositely directed induction
of 0.3 T
HIRM A/m: "Hard" isothermal remanent magnetization = (IRM 1.2T - IRM-0.3T) / 2
S:  The "S" parameter = -IRM1.2T / IRM -0.3T
Paramagnetic MS: Paramagnetic magnetic susceptibility determined from the
slope of the hysteresis curve above an induction of 0.9T
Msat A/m:  Saturation magnetization determined after removal of
paramagnetic component.
Mrs A/m:  Saturation Remanent magnetization
Hc mT:  Coercivity determined after removal of para magnetic component.
Hcr mT:  Coercivity of remanence
Parts-per-Million Abundances for the following elements
Ti WT%:  Weight-percent of Titanium
Total Carbon (percent)
Carbonate Carbon (percent)
Organic Carbon (percent)

U.S. Geological Survey Open-File Report 95-673