01) Need examples of people using Low Frequency Radiation
(ULF/ELF/VLF/LF) to detect underground structures such as ancient
buildings.

02) Need an explanation of how the technology works.

Hello,

Q1:
Ground penetrating radar has been used in a variety of applications
from underground archaeological mappings to hunting down Al-Qaeda
weapon stashes burried underground in Afganistan.
Groundpenetratingradar.com has a great section on ground penetrating
radar applications outlining different uses such as:

Underground Storage Tanks (USTs)
Utility Location
Buried Drums
Concrete Inspection
Sinkholes and Subsidence
Grave Site Location
Landfills and Burial Trenches
Archaeological Studies
Underground Structures
Site Characterization

Please see the link below for more information.


Q2:
A very good explanation about ground penetrating radar can be found on
the article linked below. They show some sample graphs and pictures
taken at different archaeology sites, and more day-to-day practical
uses such as finding septic tanks and other underground structures.
They also go over the benefits of using lower or higher frequency
electromagnetic waves.


Search Strategy:

underground radar "low frequency" Archaeology on google:
://www.google.com/search?q=underground+radar+%22low+frequency%22+Archaeology


Additional Links:

Ground Penetrating Radar Applications (click on the flashing red
buttons for more info on each specific function):
http://www.groundpenetratingradar.com/

How ground penetrating radar works:
http://www.groundpenetratingradar.com/text.htm


Glad I could help you with your questions!

skermit-ga

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Request for Answer Clarification by kongulu-ga on 27 Jan 2003 01:23 PST

Dear Skermit; This is a confusing area, normally I associate RADAR
with high frequency (for example a quote from the 3rd link you
provided -> "Ground penetrating radar operates by transmitting pulses
of ultra high frequency radio waves"). I was specificaly looking for
ULF/ELF/VLF/LF (low frequency) technologies. However, I did a little
searching myself and discovered a reference to a Low Frequency Radar;
but the frequency range was not mentioned and could be a "relatively"
low frequency. In summary your answer was helpful, but I am planning
to reword and repost, so please keep an eye out. What I am trying to
find are references to ULF/ELF/VLF/LF soundings as relates to the
search for oil. If you want to answer the above I will treat it as a
new question in the tip. Thank You