Name: Quaternary Active Folds

Display Field: FOLD_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: Washington has dozens of rock folds with geologic evidence of deformation in the Quaternary time period. This dataset contains geologically well-supported interpretations of Quaternary fold location, age, and other parameters important for assessing seismic hazard. Folds are important for assessing seismic hazard because faults in the deep subsurface can cause folding of rocks, and folding of rocks closer to the surface can trigger movement on associated faults. Therefore, folds mark places where earthquake-generating faults may exist, but may not yet be characterized. Another term commonly used for folds with movement during the Quaternary is "active". For the Washington Geological Survey, "active" means that a fold has evidence for movement within the Holocene time period (since about 12,000 years ago). We include active folds in this database as well as other folds that have evidence for movement within the Quaternary time period (last 2.58 million years) or suspected movement in the Quaternary, because associated faults all have the potential to create a damaging earthquake sometime in the future within a time frame that matters to humans. Throughout scientific history in Washington state, different interpretations of Quaternary faults and folds have resulted from different mapping methods and scales of investigation. Dataset users will benefit from a full investigation of sources cited, other past work, and developing an understanding of the breadth of study types for any particular fold of interest. For earthquake hazards characterization, this database is best used in reconnaisance-scale investigations, to identify regions closer or further 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 rely on high precision fault placement with respect to specific properties.

Service Item Id: c4359a9a56b0400bbe9dd141c94e9dea

Copyright Text:

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 24000.0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

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Extent:

XMin: 978567.0
YMin: 124290.0
XMax: 2059222.0
YMax: 932924.376953125
Spatial Reference: 2927  (2927)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: FOLD_VISIBILITY_DESC
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: visible fold trace
  Label: Visible fold trace
  Description: N/A
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  Color: [230, 0, 169, 255]
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• Value: inferred fold trace
  Label: Inferred fold trace
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  Symbol:
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• Value: concealed fold trace
  Label: Concealed fold trace
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Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
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Supports Query With Distance: true
Supports Sql Expression: true
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HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• ACTIVE_FOLD_ID ( type: esriFieldTypeSmallInteger, alias: Active Fold ID )
• FOLD_NAME ( type: esriFieldTypeString, alias: Fold Name, length: 80 )
• FOLD_TYPE ( type: esriFieldTypeString, alias: Fold Type, length: 12 )
• GEOLOGIC_AGE ( type: esriFieldTypeString, alias: Geologic Age (Years), length: 12 )
• GEOLOGIC_AGE_DESC ( type: esriFieldTypeString, alias: Geologic Age Description, length: 50 )
• FOLD_DETECT_METHOD_DESC ( type: esriFieldTypeString, alias: Fold Detection Method, length: 24 )
• FOLD_VISIBILITY_DESC ( type: esriFieldTypeString, alias: Fold Visibility, length: 24 )
• FOLD_SOURCE_CITATION ( type: esriFieldTypeString, alias: Fold Source Citation, length: 500 )
• USGS_FOLD_ID ( type: esriFieldTypeString, alias: USGS Fold ID, length: 10 )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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