ConeTec is adapting to the changing conditions of the COVID19 pandemic by modifying our actions relative to current regional risk levels. With our updated COVID19 preparedness standard as a guide, we will increase or decrease our practices and procedures based on publicly available pandemic data. By including risk levels within our standards, we are creating a roadmap for de-escalation of controls as the virus wanes, or the escalation of measures during subsequent waves.
To learn more about the details of our COVID-19 response plan, please contact us at HSE@conetec.com or click here.
Multichannel Analysis of Surface Waves (MASW) is a geophysical method that uses surface wave (Rayleigh wave) propagation to profile the subsurface. The result of an MASW survey is a 20-60 m depth profile of subsurface shear wave velocity (shear stiffness), without the need for a borehole. Surveys may be completed in 1D or 2D.
Features
Accelerated Weight Drop high energy source for efficient, low frequency response
24-96 channel land streamer for rapid 2D profiling (1 km per day)
Modular system – large multichannel arrays possible
Use of latest analysis software and data interpretation routines
Active and Passive source data collection
Add on precision GNSS survey for accurate georeferencing and locational information
Highly trained and experienced geophysics/geotechnical field and office teams
Advantages
Rapid site investigation: 1D or 2D Vs Profiles
Non-intrusive / non-destructive test method - no ground disturbance necessary
Effective in environments with high background seismic noise
Sensitive to low velocity layers and velocity inversions at depth
Rapidly deployed and highly portable
MASW and SRT data sets may be collected simultaneously
Applications
Vs profiling for seismic site classification (Vs30), without a borehole
Ground stiffness evaluations
Liquefaction assessment, particularly in gravels and cobbles where SCPTu is not possible
Site reconnaissance prior to drilling and in-situ testing
Bedrock or glacial till mapping
Dam and Levee investigations
Backfill testing
Ground improvement QA/QC
Basement and indoor geotechnical evaluations
Delineation of “soft zones”, potential voids, other anomaly detection
Linear structure foundation evaluations (rail, highway, pipeline, road)
