Probabilistic Seismic Hazard Maps - Inputs and Status
Probabilistic Seismic Hazard Maps - Inputs and Status Choi Yoon Seok Jennifer S. Haase Robert L. Nowack Purdue University Status Preliminary data sets used as of 11/20/05 Approximate bedrock topography and surface wave velocity model constructed. Preliminary v1.0 full calculation completed and presented at Fall AGU 12/8/05 Very sensitive to bedrock depth Second calculation using new version of Cramers PSHA code completed 2/18/06 0.2 sec expected acc. Increased by ~0.1g Investigated larger period range
Third run with finalized model planned 4/06 Amplification Factor Legend PGA_0.05 Prediction Map Site amplificat ion factor [Amp_pga_all].[A_2] Filled Contours 1 - 1.4 1.4 - 1.8 1.8 - 2.2 2.2 - 2.6
0.4 - 0.5 0.5 - 0.6 0.6 - 0.7 0.7 - 0.8 0.8 - 0.9 0.9 - 1 1 - 1.1 1.1 - 1.2 1.2 - 1.3 1.3 - 1.4 1.4 - 1.5 1.5 - 1.6 1.6 - 1.7 Data inputs 48 USGS CPT Used to assign Vs to unit types - loess, alluvium, lacustrine - averaged over depth to one Vs
33 borehole Vs Used to assign Vs to unit types - averaged over depth to one Vs 570 new SPT at 60 geotechnical sites Not used - not satisfied with SPT => Vs 230 Vp refraction Used for depth to bedrock Used for bedrock velocity (Vs=Vp/1.72) Data inputs KGS Vs refraction profiles (CUSEC report) Used only to check approx bedrock Vs IGS Ilith water well logs Used for bedrock depth Not used for densifying lateral varying
lithology, yet KY bedrock elevation points (R. Counts) Data inputs Surficial geology Used to determine surface lithology type, then one velocity and uncertainty assigned to all grid points within that map area All these surficial geology maps were preliminary products Quadrangle Map Status? Caborn (name?) Quadrangle surficial maping IN side IGS surficial mapping KY side KGS Steve Martin 11/2005 KGS Ron Counts revising
bedrock contours 4/2006? Evansville N Quadrangle prelim surf mapping Scott Lundstrom 11/2005 final surf mapping ? Daylight Quadrangle surf mapping IGS old GIS database Scott Lundstrom ? West Franklin surf mapping KGS Steve Martin 11/2005 KGS R. Counts revising bedrock contours 4/2006 Dave Moore
Evansville S Newburgh prelim surf mapping field mapping done 4/2006? Scott Lundstrom 11/2005 Scott Lundstrom final surf mapping existing surf mapping KGS DVGQ map Wilson Henderson Spottsville field mapping done 4/2006? Mike Murphy Mark Thompson
existing surf mapping KGS DVGQ map Bedrock depth model Effect of depth of soil on amplification Legend PGA_0.05 Prediction Map Site amplificat ion factor [Amp_pga_all].[A_2] Filled Contours 1 - 1.4 1.4 - 1.8
1.8 - 2.2 2.2 - 2.6 At 0.05 g input 2.6 - 3 3 - 3.4 3.4 - 3.8 3.8 - 4.2 4.2 - 4.6 4.6 - 5 5 - 5.4 5.4 - 5.8 5.8 - 6.2 6.2 - 6.6 6.6 - 7 Whats left to try? Use more data to determine correspondence
between velocity and unit lithology Water wells and SPTs : calculate average velocity given the total thickness of different units using lithology for each unit Try a depth dependence for each unit Need some kind of numbers for bedrock Refraction data in Rons marginal areas Make cross sections through our Vs/bedrock model for detailed cross section lines to make sure they are consistent with detailed depositional cross sections. Products PSHA maps at any level desired Level of acceleration in g with X% probability to be exceeded in 50 years At pga, 0.2 sec, 1 sec (or others) 9 quadrangle region Scenario earthquake calculation for Indiana
side? Using same scenarios as Zhenming? Products From 3D Vs above bedrock model can calculate site classification Give information to CUSEC to make updated NEHRP soil classification maps These could be available products to other scientists and also users of HAZUS
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