The oldest and most reliable method for continuous bedrock mapping is through combined seismic methods data sets that are collected simultaneously.

Seismic methods are ideal for depth ranges from 5 meters to any depth.

2D Profile with compressional wave velocities. Referred to as Refraction Tomography.

Assigning a geologic unit to each range of velocities.

Combining 2D Profiles

Many 2D profiles can be collected quickly to produce a 3D plan map of bedrock elevations

Data can be collected on land and water

When data can be collected along a drivable road then the sensors can be dragged and the seismic source is an elastic hammer: called a Land Streamer

This is a relatively short profile of under 500 meters collected in less than a day.

HVSR data used to calculate bedrock depth at specific locations using devices such as HVSR device, Tromino™ BLU or 3 component Smartsolo™ IGU-16HR 3C 5Hz.

Very shallow bedrock, under 5 meters, can be mapped with alternatives very quickly such as Ground Penetrating Radar

Example image where kilometers of data can be collected in a day.