SubSurface Evaluations

SEI announces the addition of the latest geophysical tool to our ever expanding geophysical capabilities: Multichannel Analysis of Surface Waves (MASW).

MASW is the latest advancement in seismic survey methods that is rapidly becoming the preeminent seismic tool for engineering geology. MASW uses the dispersive nature of surface waves to map the values of shear wave velocities (Vs) of the underlying soil and rock layers. These shear-wave velocities correlate well to density, and are a common proxy where drilling may be too costly, time consuming, or impossible.

The depth of investigation is typically about 50% of the distance of the geophone spread along the surface and does not suffer the same velocity inversion problems as other seismic methods do. Therefore, this method is perfect for detecting weak zones and voids. The results are typically provided as interpolated cross-sections of shear-wave velocity along the transect lines generated from dozens of individual “shots” and are GPS referenced for easy boring location and correlation. The data provided by the MASW method is quantitative in nature, with little room for error in interpretation.

SEI on winning teams for FDOT District 1 and OOCEA contracts for geotechnical services. For the FDOT District 1, we teamed with Williams Earth Sciences, Inc., who we successfully teamed with for the FDOT District 7 contract. For the Orlando Orange County Expressway Authority we teamed with Nodarse and Associates, Inc. We look forward to working with our teams on these upcoming projects!

SEI is pleased to announce Jonathan Welker has joined SEI as a Staff Geologist. Jonathan has a background in marine geophysics and extensive experience in the Tampa area related to environmental evaluations and GIS mapping.

SEI is pleased to announce that Heather Ribble has joined SEI as Operations Assistant. Heather has an excellent background in office operations and we welcome her.

SEI now accepts Visa, Master Card, Discover, and American Express so that our clients have the flexible and easy payment options.

SEI is pleased to announce, in conjunction with the Karst Waters Institute, the 2007 William L. Wilson Memorial Scholarship has been awarded to Ms. Megan Curry. Ms Curry is a graduate student at the New Mexico Institute of Mining and Technology, Socorro, New Mexico. Her thesis of study concerns the geomicrobiological & geochemical biogenicity of moonmilk formations in Thursday Morning Cave, Colorado; Thrush Cave, Alaska; and Spider Cave & Pahoehoe Cave, New Mexico. Congratulations Megan and we look forward to your advancement of geoscience.