ASTM D4428 Crosshole Seismic Testing for Geotechnical Site Characterization
In ASTM D4428, the velocity of two types of horizontally traveling seismic waves in soil materials, primary compression (P-wave) and secondary shear (S-wave), can only be determined. The values stated in SI are considered as standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D4428 provides standardized test methods for determining the in-situ shear-wave and compression-wave velocity profiles of soil and rock using cross-hole seismic testing. These wave velocity profiles are used to calculate the small-strain dynamic elastic moduli — shear modulus (G) and constrained modulus (M) — of the subsurface materials, which are fundamental parameters for earthquake engineering, foundation vibration analysis, and site response studies.
The test is performed by installing two or more boreholes at known spacing and generating seismic waves in one borehole (the source hole) while measuring their arrival in adjacent boreholes (receiver holes) at multiple depth intervals. The travel time between source and receiver is measured with high precision, and the wave velocity is calculated from the known inter-borehole distance and travel time. The resulting velocity profile characterizes the subsurface’s dynamic stiffness with depth.
Scope, Applications, and Benefits
Scope
ASTM D4428 evaluates:
- In-situ shear wave velocity (Vs) profile with depth
- Compression wave velocity (Vp) profile with depth
- Small-strain shear modulus (Gmax) and constrained modulus (M)
- Dynamic Poisson’s ratio from Vs and Vp data
- Variability of seismic properties between boreholes
- Depth to bedrock or stiff layers from velocity contrasts
Applications
- Earthquake site response analysis (site class determination)
- Foundation vibration and dynamic stiffness design
- Liquefaction potential assessment
- Dam and embankment dynamic analysis
- Nuclear facility site characterization
- Infrastructure site investigation for highways and bridges
- Ground improvement effectiveness verification
Benefits
- Provides in-situ dynamic properties without sample disturbance
- Enables site class determination per ASCE 7 and IBC
- Supports seismic hazard and ground response analysis
- Detects soft soil layers and lateral variability
- Provides data for numerical dynamic analysis of structures
- Required by building codes for seismic design in high-hazard zones
Test Process
Borehole Installation
Boreholes are drilled and cased at specified spacing; casing is grouted to ensure coupling.
1Source Generation
Seismic waves are generated in the source borehole using a downhole hammer or sparker source.
2Travel Time Measurement
Three-component geophones in receiver boreholes record wave arrivals; travel times are precisely measured.
3Velocity Calculation
Shear and compression wave velocities are calculated from travel time and inter-borehole distance.
4Technical Specifications
| Parameter | Details |
|---|---|
| Test Principle | Cross-borehole seismic wave travel time measurement |
| Wave Types | Shear wave (S-wave), compression wave (P-wave) |
| Borehole Spacing | 3–5 m typical |
| Applicable Materials | In-situ soils and rock |
| Output Units | m/s (wave velocity), MPa (dynamic moduli) |
| Measured Outputs | Vs, Vp profiles with depth; Gmax, M, dynamic Poisson's ratio |
Instrumentation Used for Testing
- Downhole seismic source (hammer or sparker)
- Three-component downhole geophones
- Seismograph with high-resolution timing
- Borehole inclinometer (for geometry correction)
- Grouted borehole casing
- Data acquisition and velocity analysis software
Results and Deliverables
- Shear wave velocity (Vs) profile with depth
- Compression wave velocity (Vp) profile with depth
- Small-strain shear modulus (Gmax) profile
- Dynamic Poisson’s ratio profile
- Site class determination (per seismic code)
- Geotechnical investigation and compliance report
Frequently Asked Questions
ASTM D4428 measures seismic wave velocities in soil and rock using crosshole testing. It evaluates subsurface stiffness and dynamic properties for geotechnical design, earthquake analysis, and foundation engineering applications.
Key parameters include borehole spacing, sensor alignment, wave travel time, depth intervals, and source energy. Controlled field conditions ensure accurate measurement of seismic wave velocities between boreholes.
The test measures shear wave and compression wave velocities. Results help determine soil stiffness, elastic moduli, and dynamic response characteristics of subsurface materials.
ASTM D4428 applies to soils, sediments, and rock formations in geotechnical, construction, and infrastructure projects requiring subsurface characterization for stability and seismic response evaluation.
ASTM D4428 requires precise borehole installation and alignment. Results may be affected by soil heterogeneity and field conditions, requiring complementary testing methods for comprehensive subsurface evaluation.
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