General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone
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1 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone David Hoffman University of Missouri Rolla Natural Hazards Mitigation Institute Civil, Architectural & Environmental Engineering Department Geology and Seismicity - 1 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 2 1
2 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 3 Central and Eastern United States Earthquake Hazard Hazard Map Based on geology and seismology Probabilistic map Geologic Factors Affecting Ground Motion Earthquake magnitude Source mechanism Distance Condition of rock along transmission path Local site conditions Duration of shaking Geology and Seismicity - 4 2
3 For Site Class B (amplification = 1.0) Geology and Seismicity - 5 The Central and Eastern United States Earthquake Hazard Several areas of the Central and Eastern United States have know earthquake hazards. This is shown on engineering design maps. FACTORS AFFECTING GROUND MOTION Magnitude Source mechanism Distance Condition of rock along transmission path Local Soil Conditions Duration of Shaking Geology and Seismicity - 6 3
4 Uplands River Valley Lowlands Soil Alluvial Soil Soil Geologic setting affects seismic ground motions. Geology and Seismicity - 7 Top of Bedrock Idealized cross-section SOUTHERN ILLINOIS EARTHQUAKE Feb. 5, Monitored in Paducah, KY Sands & Gravels Surface 134 Ft. Sand, Silt, Clay Bedrock 335 Ft. Geology and Seismicity - 8 Kentucky Geological Survey & University of Kentucky 4
5 Uplands River Valley Lowlands Soil Alluvial Soil Soil Seismic waves felt by different soil types and bedrock. Geology and Seismicity - 9 Top of Bedrock Idealized cross-section Soil Type and Properties Affect Site Amplification Increasing Amplification Geology and Seismicity - 10 Site Specific Investigation should be performed - can be <1 to as high as 10X 5
6 Uplands Soil x E D River Valley x 0-10 F Alluvial Soil Lowlands x x D Soil C Soil Site Class and amplification characteristics. Geology and Seismicity - 11 Top of Bedrock Idealized cross-section Uplands River Valley BRIDGE SITES Lowlands BUILDING SITES Soil Manmade structures are often built in areas most susceptible to amplified ground shaking. Alluvial Soil Soil Idealized cross-section Geology and Seismicity
7 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 13 Regional geology, topography and seismicity Geology Stable contential interior Older rocks Glacial sediments Gulf Coastal Plain Mississippi Embayment New Madrid Seismic Zone Topography Very flat Seismicity Northern Mississippi Embayment Geology and Seismicity
8 General Geology of the New Madrid Seismic Zone and Mississippi Embayment Area Mississippi Embayment Soft Sediments Quaternary alluvium Tertiary Cretaceous Older Bedrock The geology and related seismicity create the earthquake hazard. MISSOURI ARKANSAS Study Site ILLINOIS NMSZ TENNESSEE INDIANA KENTUCKY Mississippian Pennsylvanian Ordovician Precambrian Geology and Seismicity - 15 MISSISSIPPI ALABAMA Ground Elevation and Topographic Relief In the Central United States Area Study Site Geology and Seismicity - 16 The New Madrid Seismic Zone (red) is in the flat lowlands (purple) of the Mississippi Embayment (yellow line). The Mississippi Embayment is a depressed area due to a weakness in the North American tectonic plate crust. 8
9 Central United States Seismicity & General Geology Seismicity is associated with the Mississippi Embayment crustal weakness. MISSOURI ILLINOIS INDIANA Mississippi Embayment KENTUCKY Soft Sediments Quaternary alluvium Tertiary Cretaceous Older Bedrock ARKANSAS Study Site TENNESSEE Mississippian Pennsylvanian Ordovician Precambrian MISSISSIPPI Earthquake Geology and Epicenters Seismicity - 17Since 1994 ALABAMA General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity
10 Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Mississippi Embayment Basin with thick soft young sediments Hard bedrock very deep Flat lowlands and flat to genteelly rolling uplands Reelfoot Rift (Mississippi Valley Graben Old weakness in Earth crust Identified by geoghysical methods Magnetic signature Gravity signature Location of seismicity Geology and Seismicity - 19 Mississippi Embayment & Central United States Seismicity I-70 I- 44 I-55 I-57 I-24 I-64 Lowlands: Alluvium Uplands: Crowleys Ridge I-40 Study Site I-40 I-65 Uplands: Kentucky & Tennessee I-30 I- 55 Earthquake Epicenters Since 1994 Geology and Seismicity - 20 Interstate Highways 10
11 Study Site Magnetic Intensity Map Showing Reelfoot Rift and Associated New Madrid Seismic Zone Seismicity Geology and Seismicity D View of Reelfoot Rift Mississippi Embayment Sediments Paleozoic Hard Rocks Earthquakes Precambrian Igneous Rocks Geology and Seismicity
12 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 23 Stratigraphy Stratigraphic Column Alluvium Tertiary and Cretaceous unconsolidated sediments Bedrock Structural Contour Maps Limited deep data Contours for various strata Profile Newer data sources Geology and Seismicity
13 Geology and Seismicity - 25 Paleozoic and Older Geology Rocks and Seismicity
14 Southeast Missouri Mississippi Embayment Area Showing Important Deep Wells (Grohskopf, 1955) Study Sites Geology and Seismicity ,000 Structural Contours on the Base of the Wilcox Group or Top of the Midway Group (Grohskoph, 1955) -1,400 Study Sites Geology and Seismicity
15 ,000 Structural Contours on the Base of the Midway Group or Top of the Cretaceous (Grohskopf, 1955) -2,000 Study Sites Geology and Seismicity - 29 North ,000 Structural Contours on the Base of the Cretaceous or Top of the Paleozoic (Grohskopf, 1955) -2,000 Study -2,500 Sites Geology and Seismicity - 30 South Profile Line 15
16 Geology and Seismicity - 31 More Detailed Stratigraphic Data for Select Areas Data Points for Top of Eocene Wilcox Sturctural Contours for Top of Eocene Wilcox (Van Arsdale Geology & and TenBrink, Seismicity ) 16
17 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 33 Geologic structure, faults and seismicity Burried Rift East northeast-west southwest compression Seismicity Pattern Four faults Three near vertical strike-slip faults One low angle reverse thrust fault Bridge Sites Both near NMSZ southwest segment strike-slip fault One near NMSZ central segment reverse thrust fault Geology and Seismicity
18 Geology and Seismicity - 35 New Madrid Seismic Zone Seismicity Epicenters Strike-Slip Faults Reverse Thrust Fault Geology and Seismicity - 36 Several faults are outlined by the frequent seismic activity in the NMSZ. Most are vertical strike-slip faults with narrow zones of epicenters but one is a reverse thrust fault with epicenters spread over a wide zone. 18
19 Geology and Seismicity - 37 Simplified Pattern and Direction of Movement for the 4 Major Faults in the New Madrid Seismic Zone Central Segment Reverse Thrust Southwest Segment Right Lateral Strike-Slip Northeast Segment Right Lateral Strike-Slip West Segment Left Lateral Strike-Slip Geology and Seismicity - 38 New Madrid Seismic Zone Seismicity and its Relationship to the Study Area I-55 passes through the NMSZ. It is subject to the varied types of fault movements and ground motions. Studied bridges are on top of or very near to the southwest strike-slip segment of the NMSZ. 19
20 Geology and Seismicity - 39 Seismicity and Simplified Pattern of Major Faults in the New Madrid Seismic Zone Major faults in the NMSZ and their relationship to I-55 and the bridges studied. Alluvial lowlands in yellow and Mississippi Embayment uplands in tan. General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity
21 Sandblows Evidence of Past Intense Sandblows Casual observation Airphoto mapping Trench logging Seismicity Associated with Sandblows Close correlation Hugh area affected Some variation related to local soils and site conditions Geology and Seismicity - 41 Study Sites Geology and Seismicity
22 Study Sites Geology and Seismicity - 43 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity
23 Attenuation Central & Eastern United States Low attenuation Ten to twenty times larger shaking intensity area Older, harder, dryer bedrock Western United States High attenuation Relatively rapid decay of shaking intensity Younger, softer, more fractured bedrock Geology and Seismicity - 45 Low seismic wave attenuation properties of the bedrock in the Central and Eastern United States results in much larger areas experiencing any given level of shaking. Geology and Seismicity
24 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 47 Local site alluvial soils Alluvial Geology Saucier (Corps of Engineers) mapping Airphoto interpretation Some soil boring Little or no field work Abandoned courses and meanders of the modern Mississippi River Glacial outwash terraces or the ancient Ohio and Mississippi Rivers Seismicity Southwest segment of NMSZ at or near bridge sites Geology and Seismicity
25 A-1466 L-472 A-1466 L-472 Bridge study sites (red circles) in Dunklin County, Missouri with local alluvial geology (Saucier, 1994) showing meander belt of modern Mississippi River system (brown, orange & yellow) and adjacent older glacial outwash terraces (tan). Geology and Seismicity - 49 Bridge study sites (red triangles) in Dunklin County, Missouri with earthquake epicenters and local alluvial geology (Saucier, 1994) showing meander belt of modern Mississippi River system (light and dark yellow & gray) and adjacent older glacial outwash terraces (tan). Geology and Seismicity
26 General Geologic Setting and Seismicity of the FHWA Project Site in the New Madrid Seismic Zone Central and Eastern United States Earthquake Hazard Regional geology, topography and seismicity Mississippi Embayment and Reelfoot Rift (Mississippi Valley Graben) Stratigraphy Geologic structure, faults and seismicity Sandblows Attenuation Local site alluvial soils Important Considerations Geology and Seismicity - 51 Important Considerations Past Large New Madrid Earthquakes Historic record Paleoseismic record Future New Madrid Earthquake Probabilities Magnitude 7.5 to 8.0 Magnitude larger than 6.0 Geology and Seismicity
27 Prehistoric and Historic Great New Madrid Earthquakes (Based on paleosesimology and historic record) DATE OF LARGE EARTHQUAKE ~300 AD ~900 AD ~1450 AD AD Geology and Seismicity - 53 INTERVAL BETWEEN EARTHQUAKES ~600 years ~550 years ~350 years During a 50 year time period the New Madrid Seismic Zone has a 7 10% probability of a M earthquake (the size of the earthquakes) OR 25 40% probability of a M 6.0 or larger earthquake (about the size of the 1895 Charleston, Missouri earthquake) Geology and Seismicity
28 QUESTIONS? David Hoffman University of Missouri Rolla Natural Hazards Mitigation Institute Civil, Architectural & Environmental Engineering Department Geology and Seismicity
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