Seismic Surveys

Downhole Shear Wave Test

Used when project specifications require borehole-based velocity control, or when surface methods need a borehole reference.

Definition

What this method is

Downhole shear-wave testing measures velocity response with depth inside a borehole to provide direct seismic stiffness information.

Used when project specifications require borehole-based velocity control, or when surface methods need a borehole reference.

How It Works

From field measurement to interpreted model

  1. 1A borehole is prepared to the required depth and condition.
  2. 2Sensors record wave arrival behavior at selected depth intervals.
  3. 3The depth-wise response is processed into a velocity profile for engineering use.

When to Use

Best-fit conditions for this method

  • Specialized geotechnical studies
  • Projects needing borehole-based seismic velocity checks
  • Programs that require confirmation against surface-wave results

What It Can Help Identify

Subsurface features and signals

  • Depth-dependent shear-wave behavior
  • Stiffness changes with depth
  • Reference data for seismic design studies

Deliverables

What you receive

  • Downhole velocity summary
  • Borehole log and acquisition notes
  • Interpretation report

Typical Outputs

What the data looks like

  • Borehole velocity profile
  • Depth interval velocity values
  • Support notes for design review

Applications

Common applications in the Philippines

Infrastructure and energy developments

Borehole QA for seismic programs

Ground-response studies

Method Limitations

What this method cannot do alone

  • Requires borehole access, borehole condition suitability, and coordination with drilling records.

Geophysical results are interpreted models based on measured physical property contrasts. Results should be correlated with boreholes, test pits, drilling, geological mapping, laboratory data, or other direct investigation methods where required.

Related Services

Methods and applications that work together

FAQs

Frequently Asked Questions

Do you need a borehole for downhole shear-wave testing?

Yes. The method uses a borehole, so access and borehole condition are part of the planning process.

When is downhole testing preferred over surface methods?

It is preferred when a project needs borehole-based velocity control or a specialized geotechnical specification.

How does downhole testing support MASW or refraction results?

It provides a borehole reference that can help ground the interpretation of surface-wave or refraction-based velocity models.

Get in touch

Discuss downhole testing requirements

Send borehole details, target depth, and project criteria so we can confirm suitability and scope.