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This database contains location, geometry, and age information about "active" faults in Washington state, updated through 2020. The WGS defines active faults as those with documented or strongly suspected Quaternary activity. Though the traces of some fault strands stop at the Washington state border, the faults may continue into the adjoining state or Canada. Please refer to information from the appropriate U.S. state, U.S. Geological Survey, or Canadian agency to confirm fault extents over the borders. Fault trace locations mark the intersections of faults with the ground surface, but the fault may dip at some angle below the adjoining area. Fault dip documentation, if available, is in the appropriate associated field. Blind fault trace locations mark where the intersection of the fault would meet the surface if the fault extended up to shallower depths. Faults in this database are edited and new faults are added as new research becomes available and WGS staff have time to add them to the database. The data steward assures general agreement with the U.S. Geological Survey Quaternary faults database, but this database may be more recently updated in areas where active research is ongoing. Faults are included if they have documentation in such publications as peer reviewed journal articles, state or federal government publications, governments reports, university Ph.D. dissertations, or Master's theses. Faults are not included from unpublished manuscripts, conference proceedings, or personal communications. Accompanying the WGS data package download is a separate database of superseded faults. These are faults removed from a prior version of the database due to new evidence updating hypotheses of a fault's location or existence. |
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This database contains location, geometry, and age information about "active" faults in Washington state, updated through 2020. The WGS defines active faults as those with documented or strongly suspected Quaternary activity. Though the traces of some fault strands stop at the Washington state border, the faults may continue into the adjoining state or Canada. Please refer to information from the appropriate U.S. state, U.S. Geological Survey, or Canadian agency to confirm fault extents over the borders. Fault trace locations mark the intersections of faults with the ground surface, but the fault may dip at some angle below the adjoining area. Fault dip documentation, if available, is in the appropriate associated field. Blind fault trace locations mark where the intersection of the fault would meet the surface if the fault extended up to shallower depths. Faults in this database are edited and new faults are added as new research becomes available and WGS staff have time to add them to the database. The data steward assures general agreement with the U.S. Geological Survey Quaternary faults database, but this database may be more recently updated in areas where active research is ongoing. Faults are included if they have documentation in such publications as peer reviewed journal articles, state or federal government publications, governments reports, university Ph.D. dissertations, or Master's theses. Faults are not included from unpublished manuscripts, conference proceedings, or personal communications. Accompanying the WGS data package download is a separate database of superseded faults. These are faults removed from a prior version of the database due to new evidence updating hypotheses of a fault's location or existence. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Washington has dozens of faults and fault zones with geologic evidence of movement in the Quaternary time period, of which many pose a significant hazard for Washington communities. This dataset contains geologically well-supported interpretations of Quaternary fault location, age and other parameters important for assessing seismic hazard. Another term commonly used for faults with movement during the Quaternary is "active". For the Washington Geological Survey, "active" means that a fault has evidence for movement within the Holocene time period (since about 12,000 years ago). It may also mean that small earthquakes have been documented on the fault. We include active faults in this database as well as other faults that have evidence for movement within the Quaternary time period (last 2.58 million years) or suspected movement in the Quaternary (also called class B), because they all have the potential to create damaging earthquakes sometime in the future within a timeframe that matters to humans. For most faults in Washington, there is not enough evidence of past earthquake activity to forecast the timing of future events. Throughout scientific history in Washington state, different interpretations of Quaternary faults have resulted from different mapping methods and scales of investigation. Dataset users will benefit from a full investigation of sources cited, reading other past work, and developing an understanding of the breadth of study types for any particular fault of interest. For geologic mapping, tectonic studies, and other scientific investigations, this database is best used for understanding the orientation of, connectivity between, and deformation along Washington fault networks in the present. For earthquake hazards characterization, this database is best used in reconnaisance-scale investigations, to identify regions closer or farther away from active faults in a qualitative sense, or in probabilistic seismic hazard analysis studies (PSHA) that consider the hazards that faults pose for a given area in a probabilistic sense. The WGS does not advise uses of this database that aim to quantify distance of a location of interest to a particular fault or that rely on high precision fault placement with respect to specific properties. </SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Disclaimer of Warranties</SPAN></P><P><SPAN /></P><P><SPAN>No express or implied warranty of any kind is made regarding the digital information contained herein, including, but not limited to, the warranty of merchantability, warranty of fitness for a particular purpose, or warranties of content, completeness, accuracy, reliability, usefulness, or that use would not infringe on privately-owned rights. Although these digital data and metadata have been processed successfully on computers of WGS, no warranty, expressed or implied, is made by WGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.</SPAN></P><P><SPAN /></P><P><SPAN /></P><P><SPAN>Use at Your Own Risk</SPAN></P><P><SPAN /></P><P><SPAN>The information presented here is intended for use as a general screening tool in community planning or for creating awareness and understanding of geologic information and is neither intended to constitute advice nor is it to be used as a substitute for site-specific advice from a licensed professional. You use this information at your own risk and should not act (or refrain from acting) based upon the information without independently verifying the information and, as appropriate, obtaining professional advice regarding your particular facts and circumstances.</SPAN></P><P><SPAN /></P><P><SPAN /></P><P><SPAN>Limitation on Liability</SPAN></P><P><SPAN /></P><P><SPAN>User agrees there shall not be liability on the State of Washington, Washington Department of Natural Resources, or their officers, agents, representatives, or employees for any damages allegedly resulting from any use of or reliance on this information. Under this limitation, there shall be no liability for any damages whatsoever, including but not limited to any damages in contract or tort for compensatory, consequential, punitive, direct, indirect, or special damages such as personal injuries, property damage, loss of profits, or any other losses or expenses.</SPAN></P><P><SPAN /></P><P><SPAN /></P><P><SPAN>No Endorsement</SPAN></P><P><SPAN /></P><P><SPAN>Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favoring. Further, the views and opinions of authors expressed herein do not necessarily state or reflect those of the State of Washington or any agency thereof.</SPAN></P></DIV></DIV></DIV> |
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Quaternary Active Faults |
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