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SOUTHWEST GEOPHYSICS. GEOPHYSICAL SERVICES. Presented By: Hans van de Vrugt, CEG, RGp Patrick F. Lehrmann, PG, RGp. Site Evaluation Direct Methods. Boreholes/Probes Test Pits/Trenches Cores. Geophysical Techniques Indirect Methods. Ground Penetrating Radar (GPR)

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Presentation Transcript
slide1

SOUTHWESTGEOPHYSICS

GEOPHYSICALSERVICES

PresentedBy:

Hans van de Vrugt, CEG, RGp

Patrick F. Lehrmann, PG, RGp

slide2

Site Evaluation

Direct Methods

  • Boreholes/Probes
  • Test Pits/Trenches
  • Cores
slide3

Geophysical Techniques

Indirect Methods

  • Ground Penetrating Radar (GPR)
  • Electromagnetics (EM)
  • Magnetics
  • Utility Locating
  • Seismics
  • Electrical Resistivity
  • Gravity
  • Very Low Frequency (VLF)
slide4

Advantages:

Geophysical Techniques

Indirect Methods

  • Non-Destructive
  • Cost Effective
  • Provides Preliminary or Supplemental Information
slide7

Ground Penetrating Radar System

Geophysical Methods

SIR 3000 – 400 MHz

SIR 3000 – 100 MHz

slide10

Common GPR Antennas

1500 MHz .5 m Structure Evaluation

900 MHz 1 m Structure Evaluation, Void Detection

400 MHz 4 m Engineering, Environmental, Void Detection

200 MHz 7 m Geotechnical, Engineering, Environmental

100 MHz 20 m Geotechnical, Environmental, Mining

slide11

Geophysical Methods

Electromagnetic Conductivity:

EM-61 and EM-31 Field Survey Equipment

EM-31

EM-61

slide12

Electromagnetic Conductivity Survey

GROUND

SURFACE

PRIMARY

FIELD

GROUND

SURFACE

INDUCED CURRENT

IN SUBSURFACE OBJECT

SECONDARY

FIELD

slide13

UST Search

Electromagnetic (EM61) Survey Data

slide14

Geophysical Methods

Magnetics - Magnetometer Equipment

Gradiometer

Magnetometer

slide16

Magnetometer Survey Data

10,000 Gallon UST

slide17

Magnetometer Survey Data

Abandoned Oil Well

slide19

Geophysical Methods

Seismic Refraction System

slide22

Depth To Bedrock Study

Seismic Refraction Velocity Model

slide23

GeophysicalMethods

Sting/Swift Earth Resistivity System

slide26

Landfill Investigation

Earth Resistivity Profiling

slide41

Instrument List

  • Sir 3000 GPR W/ 400, 900 & 1600 MHz Antennas
  • Geonics EM61 Time Domain EM Metal Detector
  • Geonics EM31 Terrain Conductivity Meter
  • Geometrics 858 Cesium Magnetometer
  • Schonstedt GA 52 Magnetic Gradiometer
  • RD4000, RD500 & Metrotech 9860 Utility Line Locators
  • Fisher M-Scope TW-6 Pipe Locator
  • Fisher M-Scope M-100 Rebar and Cable Locator
  • Instantel Blastmate III Vibration Monitor
  • Geometrics StrataView 24 Channel Seismograph
  • AGI Super Sting R8 Resistivity Meter
  • Trimble Pro XRS GPS
slide42

Advantages/Limitations

Advantages

  • Non Destructive
  • Quick Data Collection
  • Cost Effective
  • Limitations
  • Depth of Penetration v. Resolution
  • Non Unique Solutions
  • Undesirable Signals/Noise