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 |