Neat idea but the distance and weak current relative to that distance (but strong enough to give a real nasty shock if you touch one of the electrodes) make it highly unlikely that the current would be detected.
George ******************** George Veni, Ph.D. Executive Director National Cave and Karst Research Institute 400-1 Cascades Avenue Carlsbad, New Mexico 88220-6215 USA Office: 575-887-5517 Fax: 575-887-5523 Mobile: 210-863-5919 gv...@nckri.org www.nckri.orgJohn Lyles <j...@losalamos.com> wrote:Is this coming up next month? If so, a team of 7 will be in the eastern branch of Lechuguilla Cave that weekend after a camp trip, heading out on the 17th. Perhaps we can stick some wires into the dirt and pick up your signals? jtml -----Original message----- From: "George Veni" gv...@nckri.org Date: Thu, 4 Oct 2012 15:05:33 -0600 To: "'New Mexico Cavers'" s...@caver.net Subject: [SWR] Big Manhole Cave - a joint project, 17-19 November > For the SWR's 50th Anniversary, I proposed a joint SWR-NCKRI project at Big > Manhole Cave. The project was accepted and now the details are worked out. > Here they are. > > > > As most of you know, "Breakthrough Is Imminent!" at Big Manhole Cave. It's > just that the diggers haven't quiet found their way to the undoubtedly big > section of the cave the air is blowing from. Some geophysical work has been > done which shows a void and its general direction, but a more detailed > picture of the situation would be helpful. This is where the SWR-NCKRI > partnership comes in. NCKRI will bring its electrical resistivity equipment, > plus a microgravity meter on loan to NCKRI from the Hoffman Environmental > Research Institute at Western Kentucky University, and conduct a > state-of-the-art 3D resistivity-microgravity survey. The two methods > combined produce information that is much more accurate and informative than > either method alone. The 3D image will also give us a more detailed picture > of the situation between the current end of Big Manhole and the start of the > currently inaccessible void. In short, NCKRI will provide the equipment and > expertise, and SWR will provide the caver-power to deploy the equipment that > will collect the data. Here is the basic plan and schedule: > > > > Friday, 16 November: A few people will show up to layout the grid for the > survey and mark the positions for the 112 resistivity and microgravity > survey points. This way everything will be ready to quickly set up the > equipment for the actual survey the next day. Most cavers will likely arrive > in the evening and camp at the well pad near the cave. > > > > Saturday, 17 November: The resistivity equipment will be deployed and > measurements made. Deploying the equipment may take 2-3 hours. Afterward, > someone will use NCKRI's survey-grade GPS equipment to get highly precise > coordinates and elevations for each station while everyone else sits and > waits a few hours for the resistivity equipment to finish collecting data. > Since resistivity involves sending a current through the ground, no one will > be allowed in the cave to prevent accidental injury in case someone touches > the metal gate while it carries current from nearby electrodes. Afterward, > the team will collect and pack-up the equipment. > > > > Sunday, 18 November: Anyone who wants to go into the cave may do so. Digging > is encouraged! Meanwhile on the surface, the microgravity survey will take > place. This survey is mostly a one-person job with a second person along for > safety and to help with moving the equipment. > > > > Large numbers of people are not needed for this project, but it would be > great to have 10 cavers on the 17th for the bulky and heavy resistivity > equipment. If you're interested and/or want more details, contact Aaron > Stockton: astoc...@blm.gov > > > > George > > > > *************************** > > > > George Veni, Ph.D. > > Executive Director > > National Cave and Karst Research Institute > > 400-1 Cascades Avenue > > Carlsbad, New Mexico 88220-6215 USA > > Office: 575-887-5517 > > Mobile: 210-863-5919 > > Fax: 575-887-5523 > > gv...@nckri.org > > www.nckri.org > > > >
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