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The active, north-verging Oak Ridge Fault and the south-verging Pitas Point-Ventura Fault are two of the structures on which this shortening occurs (for example, Sorlien and others, 2000; Fisher and others, 2005, 2009). High-resolution seismic-reflection profiles (sheet 8, SIM 3254) reveal that neither fault ruptures the surface; instead, the surface expression of each fault is a narrow, asymmetric fold that involves the uppermost Pleistocene and Holocene (less than 21 ka) sedimentary section. Both structures are inferred to be parts of long fault systems that extend for more than 100 km, representing important potential earthquake hazards (for example, Fisher and others, 2009). Shortening is also occurring on the Montalvo Fault and Anticline system along the southeast edge of the map area (part of the broader Oak Ridge Fault Zone; Yeats, 1998) and on the Rincon-Ventura Avenue Anticline (for example, Rockwell and others, 1988), which crosses the northwest edge of the map area.", "geometryType": "esriGeometryPolyline", "sourceSpatialReference": { "wkid": 102100, "latestWkid": 3857 }, "copyrightText": "", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "uniqueValue", "field1": "RuleID", "field2": null, "field3": null, "defaultSymbol": null, "defaultLabel": null, "uniqueValueInfos": [ { "symbol": { "type": "esriSLS", "style": "esriSLSDash", "color": [ 0, 0, 0, 255 ], "width": 0.432 }, "value": "7", "label": "7", "description": "" } ], "fieldDelimiter": "," }, "transparency": 0, "labelingInfo": null }, "defaultVisibility": true, "extent": { "xmin": -1.3276787152764784E7, "ymin": 4058156.231064712, "xmax": -1.3275979057192614E7, "ymax": 4058490.110943556, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "Imp_FType", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "FID", "type": "esriFieldTypeOID", "alias": "FID", "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape", "domain": null }, { "name": "Imp_FType", "type": "esriFieldTypeString", "alias": "Imp_FType", "length": 254, "domain": null }, { "name": "Label", "type": "esriFieldTypeString", "alias": "Label", "length": 254, "domain": null }, { "name": "LocationCo", "type": "esriFieldTypeSingle", "alias": "LocationCo", "domain": null }, { "name": "ExConf", "type": "esriFieldTypeSmallInteger", "alias": "ExConf", "domain": null }, { "name": "IDConf", "type": "esriFieldTypeSmallInteger", "alias": "IDConf", "domain": null }, { "name": "LocationMe", "type": "esriFieldTypeString", "alias": "LocationMe", "length": 254, "domain": null }, { "name": "DataSource", "type": "esriFieldTypeInteger", "alias": "DataSource", "domain": null }, { "name": "Notes", "type": "esriFieldTypeString", "alias": "Notes", "length": 254, "domain": null }, { "name": "RuleID", "type": "esriFieldTypeInteger", "alias": "RuleID", "domain": null }, { "name": "FGDCRefNo", "type": "esriFieldTypeString", "alias": "FGDCRefNo", "length": 254, "domain": null }, { "name": "FGDCDesc", "type": "esriFieldTypeString", "alias": "FGDCDesc", "length": 254, "domain": null }, { "name": "FC_ID", "type": "esriFieldTypeInteger", "alias": "FC_ID", "domain": null }, { "name": "Shape_Leng", "type": "esriFieldTypeDouble", "alias": "Shape_Leng", "domain": null } ], "geometryField": { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape" }, "indexes": [ { "name": "Shape", "fields": "Shape", "isAscending": true, "isUnique": false, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": true, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 1000, "supportsStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, AMF, geoJSON", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsHavingClause": false, "supportsCountDistinct": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsPagination": false, "supportsTrueCurve": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": false }, "supportsDatumTransformation": true, "supportsCoordinatesQuantization": true }