000020018 001__ 20018
000020018 005__ 20170118182351.0
000020018 04107 $$aeng
000020018 046__ $$k2017-01-09
000020018 100__ $$aPancha, Aasha
000020018 24500 $$aApplications of Refraction Microtremor Done Right, and Pitfalls of Microtremor Arrays Done Wrong

000020018 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020018 260__ $$b
000020018 506__ $$arestricted
000020018 520__ $$2eng$$aThe geotechnical industry has widely adopted the refraction microtremor shear-wave velocity measurement technique since Louie’s original paper on the method in 2001, and is accepted by building authorities around the world. After successful initial commercialization, the developers have further adapted the method to new applications. Clark County and the City of Henderson, Nevada populated their Earthquake Parcel Map with over 10,000 site measurements for building code enforcement, made over a three-year period. A new 2D refraction microtremor analysis now allows engineers to image lateral shear-wave velocity variations and do passive subsurface imaging. The developers have extended the range of 2D refraction microtremor analysis to several kilometers depth, completing several deep-basin shear-wave velocity measurement programs for the USGS. We present an uncertainty analysis that incorporates variance in picking of the dispersion curves together with trade-offs in the modeled shear-wave velocities. The uncertainty analysis extends to 2D refraction microtremor sections. The goal is to provide users with confidence limits on the results when using them for site classification, geological interpretation, or community velocity models for scenario shaking computations. Unfortunately, any useful and popular measurement technique can be abused. Practitioners must carefully follow correct data collection, analysis, interpretation, and modeling procedures, or the outcomes cannot be labeled “refraction microtremor” or “ReMi™” results. Inexperienced or ill-informed practitioners have at times failed to produce correct shearwave velocities, due to either improper data acquisition or faulty analysis techniques. We present some of the common mistakes, and provide solutions with the objective of establishing a “best practices” template for getting consistent, reliable models from refraction microtremor measurements.

000020018 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020018 653__ $$aGeotechnical shear velocity, Seismic microzonation, Surface-wave dispersion, Uncertainties, Modeling.

000020018 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020018 720__ $$aPancha, Aasha$$iPullammanappallil, Satish$$iLouie, John N.
000020018 8560_ $$ffischerc@itam.cas.cz
000020018 8564_ $$s799972$$uhttps://invenio.itam.cas.cz/record/20018/files/4947.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4947.
000020018 962__ $$r16048
000020018 980__ $$aPAPER