Groundwatch PH

Geological Services

Rockhead Mapping

Groundwatch combines seismic-led and supporting datasets to map probable rockhead variation so design and earthwork teams can reduce uncertainty before excavation.

Definition

What this method is

Rockhead mapping is an integrated geophysical interpretation workflow used to estimate depth-to-rock trends for engineering planning and constructability decisions.

Groundwatch combines seismic-led and supporting datasets to map probable rockhead variation so design and earthwork teams can reduce uncertainty before excavation.

How It Works

From field measurement to interpreted model

  1. 1Survey objectives, alignment constraints, and target depth range are defined with the project team.
  2. 2Seismic and supporting geophysical measurements are acquired along planned lines or grids.
  3. 3Interpretation generates rockhead trend sections and recommended follow-up points for direct validation.

When to Use

Best-fit conditions for this method

  • Pre-earthwork and cut-and-fill planning for roads and site development
  • Foundation investigations where rock depth variability affects design
  • Quarry, infrastructure, or slope projects needing depth-to-rock context

What It Can Help Identify

Subsurface features and signals

  • Depth-to-rock trend changes across the site
  • Possible weathered-to-fresh rock transitions
  • Zones where excavation difficulty or design risk may increase

Deliverables

What you receive

  • Rockhead interpretation sections
  • Depth-to-rock mapping summary
  • Validation recommendations for boreholes or test pits

Typical Outputs

What the data looks like

  • Interpreted rockhead profiles
  • Alignment-based depth-to-rock picks
  • Priority ground-truthing locations

Applications

Common applications in the Philippines

Road corridor and bridge approach studies

Industrial and commercial site development

Mining, quarry, and slope-risk baseline investigations

Method Limitations

What this method cannot do alone

  • Rockhead interpretation is model-based and depends on acquisition quality and geological complexity.
  • Depth picks should be correlated with boreholes, test pits, or excavation exposure where required.
  • Layer reversals or complex weathering can increase interpretation uncertainty in some sites.

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

Can rockhead mapping replace boreholes?

No. It helps optimize borehole targeting and reduce uncertainty, but direct investigation is still required for confirmation.

Is rockhead mapping useful for foundation design planning?

Yes. It helps indicate depth variability and potential risk zones that influence foundation and excavation strategy.

What methods are commonly used for rockhead mapping?

Seismic refraction is commonly used, often supported by other geophysical or geological data depending on site conditions and objectives.

Get in touch

Plan a rockhead mapping survey

Provide target alignment and project constraints.

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