revised: 05-Feb-2015

NMBGMR Draft Geologic Data Model - v. 1.0.4
SYMBOLOGY: Fault Point Features

In the interests of standardization and interoperability, we are migrating our geologic maps into the USGS NCGMP09 data model. However, our well data model is still actively being used. Documentation for the NMBGMR geology data model is being provided for users with legacy data in this model. We also hope that it will provoke discussion in the ongoing effort to improve NCGMP09 and other models.

This document indicates how data collected at a point for faults, joints, and shear zones portrayed on a geologic map should be coded in the data model. See the NMBGMR Symbol set (3.7 Mb PDF) for details on how our standard symbology is constructed. If the fault measurement is for a mapped fault, set MappedFeat="yes" and remove the strike line from the symbol.

Description Symbol Feature Classes & Attributes Comment
joint-horizontal map symbol Fault_point
  • MappedFeat="no"
  • StructClass="joint"
  • FaultType=[null]
  • Inclnation="horizontal"
  
joint-inclined map symbol Fault_point
  • MappedFeat="no"
  • StructClass="joint"
  • FaultType=[null]
  • Inclnation="inclined"
  • DipDir="310"
  • Dip="80"
  
joint-vertical map symbol Fault_point
  • MappedFeat="no"
  • StructClass="joint"
  • FaultType=[null]
  • Inclnation="vertical"
  • DipDir="66"
  • Dip="90"
  
minor_fault-inclined map symbol Fault_point
  • MappedFeat="no"
  • StructClass="fault"
  • FaultType="oblique-slip"
  • SlipSense="reverse"
  • SubSlipSns="sinistral"
  • SlipBasis="unspecified"
  • Inclnation="inclined"
  • DipDir="310"
  • Dip="80"
  • FltLnType="slickenline"
  • Trend="20"
  • Plunge="50"
 Minor fault not measured on a mapped fault. Slickenline in gray for clarity.
minor_fault-slickenline_rake map symbol Fault_point
  • MappedFeat="no"
  • StructClass="fault"
  • FaultType="oblique-slip"
  • SlipSense="reverse"
  • SubSlipSns="sinistral"
  • SlipBasis="unspecified"
  • Inclnation="inclined"
  • DipDir="310"
  • Dip="85"
  • FltLnType="slickenline"
  • Rake="50"

Minor fault not measured on a mapped fault. Fault plane in gray for clarity.

How will we deal with which direction the rake is measured from? Should we use a direction like NE or should we give the azimuth of whichever side the rake was measured from? Alternatively, we could populate the trend and plunge fields when digitizing (need to do the math).

shearzone-inclined map symbol Fault_point
  • MappedFeat="no"
  • StructClass="shear zone"
  • FaultType="dip-slip"
  • SlipSense="unknown"
  • Inclnation="inclined"
  • DipDir="110"
  • Dip="65"