Search found 11 matches

by Kknq
Tue Sep 08, 2020 3:53 am
Forum: Buy, Sell or Trade
Topic: NogginPlus 250Mhz for sale $8,000
Replies: 2
Views: 154

Re: NogginPlus 250Mhz for sale $8,000

Hey, Id like to ask some question.

Hows the overall depth penetration of the 250Mhz and it what condition is the GPR?
by Kknq
Tue Sep 08, 2020 3:32 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

gmradar wrote:
Mon Sep 07, 2020 12:37 pm
From the data above I’m not sure there is a tunnel anywhere.
What could cause such anomalies? I have surveyed the wholel area and this was the only area that showed anomalies. The contrast has been turned down all the way and it still shows a strong signal.
by Kknq
Tue Sep 08, 2020 3:31 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

At least you can see some anomalies. If the anomalies were caused by a tunnel, the tunnel might have collapsed. I think the more important question is, how large the area have you scanned. If you see this kind of anomalies everywhere, it's probably not a tunnel. If it's the only anomaly area you se...
by Kknq
Mon Sep 07, 2020 8:49 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Hello everyone, If you remember me I was actually able to conduct several survey on the said matter. Ill attach you some images and I would be more then happy if someone could tell me, if this actually is what I am looking for! https://imgur.com/geQF6m2 https://imgur.com/XZ6ToRC https://imgur.com/rj...
by Kknq
Sun Mar 29, 2020 7:23 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Since it appears that you have more time than money, the target is relatively shallow, and relatively large versus the depth I would suggest electrical resistivity tomography. The DUOYI DY4300B 4-Terminal Earth Ground Resistance and Soil Resistivity Meter costs just over $300 USD for a kit with a r...
by Kknq
Sun Mar 29, 2020 7:17 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Has anyone ever worked with RD1500? Would you rather choose the Easy Locator PRO HDR or RD1500? Thanks for any help in advance! I would expect the penetration depths of RD1500 and Mala Easy Locator Pro HDR are very similar. The antenna frequency of RD1500 is 250MHz, lower than Mala's GPR; but Mala'...
by Kknq
Thu Mar 05, 2020 6:23 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Has anyone ever worked with RD1500? Would you rather choose the Easy Locator PRO HDR or RD1500? Thanks for any help in advance!
by Kknq
Thu Mar 05, 2020 7:00 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

geophix wrote:
Tue Mar 03, 2020 5:25 pm
Electromagnetic mapping (measuring ground conductivity) could be another way to find what you are looking for depending on the soil conditions.
We are actually also considering this method, just looking for a good device.

Thanks for the response!
by Kknq
Thu Mar 05, 2020 6:57 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Maybe think about a high resolution gravity survey? You are dealing with a shallow "anomaly" and the density contrast between rock and air is pretty big. A friend who did geophysics at Imperial Collge London told me they used to map the boundary of an underground carpark (under a park) in London th...
by Kknq
Thu Mar 05, 2020 6:54 am
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Re: Locating a man made tunnel

Since you are looking for a relatively large target, I would suggest you choose a GPR with lowest frequency to achieve maximum penetration depth. The GPRs you listed are very similar to each other and I don't think you need worry too much about the resolution for your target. So just choose the one...
by Kknq
Sun Mar 01, 2020 6:04 pm
Forum: Near Surface Geophysics
Topic: Locating a man made tunnel
Replies: 21
Views: 8874

Locating a man made tunnel

Hello everyone, First and foremost, I am sorry if this is categorized as Off Topic, but while I was searching through this forum, I saw several similiar questions so it seems that its not against the rules? Anyway, while you are already here heres a little of backstory on my matter. My great-grandfa...