Fault Attributes Key
NAME is an 80-character field for the name of the fault (including section name, i.e., Denali fault, Holitna
section). Fault and section are lower case.
CODE is a three-integer field.that defines certainty or reliability of field mapping (integer one), time of most
recent movement (integer two), and amount or rate of slip (integer three). CODE is composite of the single integer fields
ACODE, SLIPCODE, and FCODE and determines the line type (fault trace) to be plotted.
NUM is a six-character unique USGS identifier that defines a fault or section id. Simple fault ids are only
numeric; section ids are alpha numeric.
AGE is the upper bounding time of the most recent surface-deforming earthquake. The allowable choices are
ACODE is the second integer in CODE and defines the upper bounding time of the most recent surface-deforming
earthquake. Permissible values are between 1 and 6:
1=historic «150 years; red =cmyk 1096680);
2= post glacial (15,000 years; orange = cmyk 1 38 1000);
3 = late Quaternary «130,000 years; green> cmyk 1002500);
4 =middle and late Quaternary «750,000 years: blue > cmyk 1004440);
5 =Quaternary «1,600,000 years; black 5);
6 = Class B (black halftone)
In the text documentation, Quaternary faults (integer two, 1-5) are Class A structures. Questionable or suspected
structures are Class B (integer two, 6).
SLIPRATE is the assigned slip rate category.
SLIPCODE is the third integer in CODE and defines the assigned slip rate category. Permissible values are
between 1 and 4 and determines line width:
1=>5 mm/year (extra wide; .048):
2 =1-5 mm/year (wide; .0325):
3 =0.2-1 mm/year (medium; .025);
4 =<.2 mm/year (thin; .015)
SLIPSENSE is normal, reverse, strike slip, thrust
DIPDIRECTION is one of the eight quadrant dip directions for the entire fault or section, not the individual
arc. C = center E =east N_ =north NE =northeast NW =northwest S =south SE =southeast SW = southwest W_ =west
SLIPDIRECT (we are not using that field anymore and can be left empty)
FCODE is the first integer in CODE and defines how well the fault is located and expressed in the landscape.
Permissible values are between 1 and 3:
1 = fault landforms are more continuous than discontinuous and mapping is accurate at given MAPPEDSCALE (solid);
2 = fault landforms are more discontinuous than continuous and mapping is accurate at given MAPPEDSCALE (dashed);
3 = location of fault is inferred (dotted)
FTYPE is one of three allowable choices provided in a pull-down menu: Well constrained (FCODE 1), Moderately
constrained (FCODE 2), and Inferred (FCODE 3)
MAPPEDSCALE is one of four allowable choices provided in a pull-down menu. Mapped scale will control
visualization of the fault at various scales.
1:24,000, fault should be more continuous than discontinuous and mapping is accurate at <10,000 scale.
1:50,000, fault should be more continuous than discontinuous and mapping is accurate at <25,000 scale.
1:100,000, fault could be more discontinuous than continuous and mapping is accurate at <50,000 scale.
1:250,000, fault location may be inferred or is poorly constrained.
Los Angeles California Area Earthquake Faults. Use the zoom bar and pulldown menu to find faults.
Click on the fault lines for more information. The earthquake faults are color coded.
Data source: USGS, ESRI Streetmap USA
CCCarto is not responsible for data errors or omissions, use as reference only.
Main Web Map
Use the pan arrows or the overview map to navigate the map.
Zoom buttons allow to quickly zoom to a predefined level on the map based on the centre of the map.
Select the map feature you want more information about.
You can also find the map feature using the pull down menu.