Geophysical survey in the field

Geophysical surveys

Geophysical
Surveys.

Broader, non-destructive subsurface characterization integrated with direct investigation data.

Continuous insight between investigation points

See more of the subsurface—not only where a borehole happens to be.

Geophysical surveys provide a broader view of ground variability, stiffness, layer continuity, rockhead and possible anomalies. We plan each survey around the engineering question and interpret it together with geology, drilling, in-situ testing and laboratory evidence.

01

MASW

Shear-wave velocity profiling for stiffness variation, seismic site characterization and ground-model development.

Surface waves · Vs profile
02

Seismic refraction

Assessment of seismic velocity contrasts, layer geometry, weathered zones and approximate rockhead.

Velocity · layer continuity
03

Downhole seismic

Depth-specific velocity measurements within a borehole for direct dynamic ground characterization.

Vp · Vs · depth
04

Electrical resistivity

Imaging of resistivity variation to support interpretation of saturation, material changes and subsurface anomalies.

ERT · profiling
Geokos specialist acquiring geophysical data in the field
Field acquisitionSurvey geometry, coupling and data quality are controlled at site—not corrected by presentation afterwards.

An integrated method

Acquisition is only the beginning.

  1. 01Define the questionRockhead, stiffness, continuity, anomalies or seismic parameters.
  2. 02Design the surveySelect the method, array, spacing and orientation for the site.
  3. 03Control field qualityCheck acquisition conditions and data response while still on site.
  4. 04Correlate & interpretReconcile results with boreholes, tests, groundwater and geology.

The Geokos principle

Geophysics does not replace drilling. It helps us connect the evidence between investigation points.

Direct evidenceBoreholes, samples and in-situ tests establish what the ground is.

Continuous responseGeophysics reveals how conditions may change across the site.

Engineering modelCombined interpretation produces a more defensible view of the subsurface.