The Basics of Interpreting GPR Data – Part 1

Webinar: The Basics of Interpreting GPR Data – Part 1

This webinar explores the basics of signals seen on GPR cross-sections. Understand responses from subsurface objects and boundaries. Learn that not everything you see in a GPR line is necessarily from the subsurface.

Using EKKO_Project software for concrete GPR data analysis and reporting

0:00 – Introduction
1:55 – What causes GPR Reflections?
4:25 – What controls the amount of GPR energy that reflects?
12:37 – GPR reflections from metallic and non-metallic utilities
16:17 – Geological reflections example
16:54 – Utility reflections example
18:50 – The shape of GPR signals
19:39 – Attenuation of GPR Signals
22:49 – Types of subsurface objects
24:20 – Hyperbolas in GPR images
27:00 – Tracking the path of a utility
28:32 – Crossing a utility at an angle
33:38 – Reflections from boundaries
34:20 – Direct air and ground arrivals at the top of all GPR images
37:24 – Direct arrivals change as surface conditions change
38:40 – Background radio frequency noise in GPR images
42:55 – Depth of GPR signal penetration
44:03 – GPR Interpretation Quiz
44:38 – Question 1 – Which target is likely non-metallic?
46:05 – Question 2 – What is the composition of the targets?
47:36 – Question 3 – Was this concrete data collected in the basement or on the second floor?
49:18 – Question 4 – What is the most plausible explanation of what happened to the pipe on Line 3?
51:22 – Question 5 – How do you interpret the vertical signals in the middle of this GPR line?
52:26 – Question 6 – Why is hyperbola 1 wider than hyperbola 2?
54:00 – Question 7 – Where is the gravel layer?
55:13 – Question 8 – What is happening in the concrete?
56:40 – Question 9 – Why are there no reflections here?
58:53 – Question 10 – What is causing the strong reflectors at about 1.6 meters?
1:00:15 – Summary
1:01:26 – Finish

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