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USGS Fault Lines

Overview

This database contains information on faults and associated folds in the United States that demonstrate geological evidence of coseismic surface deformation in large earthquakes during the past 1.6 million years (Myr). At the time the Quaternary Fault and Fold database was established (1993), the Quaternary time period was defined as <1.6 Myr in the 1983 Geologic Time Scale, published in 1983. In 1999, it was updated to 1.8 Myr, and in 2009 it was revised to 2.6 Myr. Most recently, in 2018 it was revised again to 2.58 Myr, see GSA Geologic Time Scale.

Attributes

location

The human readable location of the fault. Usually, this is a state or county

string
section_name

The name of the section of the fault (or fault area) to which this feature belongs

string
fault_id

The USGS ID of the fault to which this feature belongs

string
fault_name

The name of the fault to which this feature belongs

string
section_id

The USGS ID of the section of the fault to which this feature belongs

string
age

The geological age of this fault

string
dip_direction

The orientation of the line on the fault plance that is perpendicular to strike

string
slip_rate

The human readable description of the fault's motion

string
slip_sense

The sense of the fault's motion

string
class

A description of the significance of a fault. For example, class A faults have good evidence of tectonic origin. Class D faults may not be the product of tectonic action at all

string
certainty

Describes how certain USGS is about the fault and its properties

string
average_strike

The orientation of the line where the fault plane intersects the horizonal plane

string
fault_length_km

The total length of the fault (in kilometers) to which this feature belongs

integer
cooperator

The agency or organization that cooperated with USGS to survey the fault

string
earthquake

The name of historic earthquakes that involved this fault

string
review_date

The date of last review

string
usgs_url

A link to more information about the fault from USGS

string