[Texascavers] Bob (Thrun that is)

[BMorgan994]

(Apologies if this appears twice, had a pooter  glitch)
 
I remember Bob (Thrun that is) from what seems to me like the  dawn of 
time. During the mid to late 60s the Washington DC area cavers were an  odd 
lot, 
lots of CIA spooks and autistic technogeeks like Bob. He took  caving very 
seriously and was methodical in all matters. Having a peach  imspediment 
didn't help his social skills. I remember him attending what  amounted to an 
orgy during which he sat staring straight ahead for hours while  everyone 
around him was busy screwing and hallucinating. I last saw  him a few years ago 
at the Old Timers Reunion. He sat staring straight  ahead as before but 
while wearing only a bra and panties.
 
I also remember Bob (Thren that is) and Squire Lewis at the  PSC fieldhouse 
in Germany valley WV in about 1967. Bob was great but Squire  Lewis and I 
almost got into a fight. He tried to throw me out of the fieldhouse  because 
I had long hair. He apparently thought of himself as another Ken Kesey,  the 
High Priest of all things cool. In his opinion I was just a punk and hadn't 
 yet earned the right to grow an afro much less stay at the fieldhouse. 
 
One more name for the Lutz memorial rock. Soon we will need a  bigger rock
 
Sleazeweazel___
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Re: [Texascavers] Bob Thrun, not Thren

[PRESTON FORSYTHE]

Bob Thrun, 77, always had a full gray beard, a shaggy beard some would say. I 
caved with him in Mexico on one trip, mid-70's, southwest of Veracruz in the 
sugar cane growing area with limestone ridges and some good caves. If you caved 
with him you would remember his detailed sketching with his book mounted on a 
tripod, very methodical, some would say--slow. Certainly not a 6 to 8 
station/hour surveyor. Quiet, but would talk about caving. Attended NSS 
conventions, but I do not remember seeing him last year at Nev. Many people in 
the DC-Bal'mer area knew Bob as he was a fixture for decades. He was an early 
computer guy, smart. He lived alone, did not go out much a mutual friend who 
knew him said. Lived a low key life, did not spend much, did not have a vehicle 
for many years. Some of his work has been noted in earlier emails.
RIP
Preston Forsythe, Browder KY 

On Wednesday, March 1, 2017 2:55 PM, Sam Young  
wrote:
 

   I thought that perhaps Shrewsbury had misspelled the name.  I inquired and 
received this reply: Hi Sam,

It is Bob Thrun, of Maryland, and a caver who primarily pushed stuff in West 
Virginia.  Bob Thren, as you know, is another person.

Wm

Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.
... Sam


 
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[Texascavers] Fw: Delivery Status Notification (Failure)

[C Tiderman]

He is alive and well. He is still caving. Helps on a lot of conservation 
projects, digs and region projects. He lives on the side of a mountain in 
Lexington, Virginia Carol

  From: Sam Young 
 To: Texascavers@texascavers.com 
 Sent: Wednesday, March 1, 2017 3:55 PM
 Subject: [Texascavers] Bob Thrun, not Thren
   
  I thought that perhaps Shrewsbury had misspelled the name.  I inquired and 
received this reply: Hi Sam,

It is Bob Thrun, of Maryland, and a caver who primarily pushed stuff in West 
Virginia.  Bob Thren, as you know, is another person.

Wm

Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.
... Sam


 
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   --- Begin Message ---
He is alive and well. He is still caving. Helps on a lot of conservation 
projects, digs and region projects. He lives on the side of a mountain in 
Lexington, Virginia Carol

  From: Sam Young 
 To: Texascavers@texascavers.com 
 Sent: Wednesday, March 1, 2017 3:55 PM
 Subject: [Texascavers] Bob Thrun, not Thren
   
  I thought that perhaps Shrewsbury had misspelled the name.  I inquired and 
received this reply: Hi Sam,

It is Bob Thrun, of Maryland, and a caver who primarily pushed stuff in West 
Virginia.  Bob Thren, as you know, is another person.

Wm

Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.
... Sam


 
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--- End Message ---
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Re: [Texascavers] Bob Thrun, not Thren

[C Tiderman]

He is alive and well. He is still caving. Helps on a lot of conservation 
projects, digs and region projects. He lives on the side of a mountain in 
Lexington, Virginia Carol

  From: Sam Young 
 To: Texascavers@texascavers.com 
 Sent: Wednesday, March 1, 2017 3:55 PM
 Subject: [Texascavers] Bob Thrun, not Thren
   
  I thought that perhaps Shrewsbury had misspelled the name.  I inquired and 
received this reply: Hi Sam,

It is Bob Thrun, of Maryland, and a caver who primarily pushed stuff in West 
Virginia.  Bob Thren, as you know, is another person.

Wm

Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.
... Sam


 
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Re: [Texascavers] Bob Thrun, not Thren

[BMorgan994]

I remember Bob (Thrun that is) from what seems to me like the  dawn of 
time. During the mid to late 60s the Washington DC area cavers were an  odd 
lot, 
lots of CIA spooks and autistic technogeeks like Bob. He took  caving very 
seriously and was methodical in all matters. Having a peach  imspediment 
didn't help his social skills. I remember him attending what  amounted to an 
orgy during which he sat staring straight ahead for hours while  everyone 
around him was busy screwing and hallucinating. I last saw  him a few years ago 
at the Old Timers Reunion. He sat staring straight  ahead as before but 
while wearing only a bra and panties.
 
I also remember Bob (Thren that is) and Squire Lewis at the  PSC fieldhouse 
in Germany valley WV in about 1967. Bob was great but Squire  Lewis and I 
almost got into a fight. He tried to throw me out of the fieldhouse  because 
I had long hair. He apparently thought of himself as another Ken Kesey,  the 
High Priest of all things cool. In his opinion I was just a punk and hadn't 
 yet earned the right to grow an afro much less stay at the fieldhouse. 
 
One more name for the Lutz memorial rock. Soon we will need a  bigger rock
 
Sleazeweazel
 
 
In a message dated 3/1/2017 3:55:43 P.M. Eastern Standard Time,  
youn...@centurytel.net writes:

I thought that perhaps Shrewsbury had misspelled the name.  I inquired  and 
received this reply:
Hi Sam,
 
 It is Bob Thrun, of Maryland, and a caver who primarily pushed stuff in 
West Virginia.  Bob Thren, as you know, is another person.
 
 Wm



Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.

... Sam







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Re: [Texascavers] Bob Thrun, not Thren

[Mark Minton]

Bob Thren is listed in the 2016 NSS Members Manual as living in Lexington, VA. 
I still see him at caver gatherings like OTR.

Mark Minton
mmin...@caver.net


On Wed, 1 Mar, 2017 at 3:55 PM, Sam Young  wrote:
 

To: Texascavers@texascavers.com

I thought that perhaps Shrewsbury had misspelled the name.  I inquired and 
received this reply:Hi Sam, It is Bob Thrun, of Maryland, and a caver who 
primarily pushed stuff in West Virginia. Bob Thren, as you know, is another 
person. Wm Now, does anyone know whatever happened to Bob Thren? He was from 
Pennsylvania, I think. ... Sam  ___
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Re: [Texascavers] NSS download speed

[Mixon Bill]

Charles (only)-- Thanks. I now get ~2MB/sec from NSS, which is good enough. 
Time-Warner's (Spectrum's) own speed test gives me 70 Mb/sec download and 10 
Mb/sec upload. My current Wi-Fi router is using 5G, whatever that means, but 
the large number of other Wi-Fi hubs in the area may be cluttering the 
airwaves, or anyway there are lots of places between me and the NSS that can be 
slowing things down.

Nature is a hanging judge.

You may "reply" to the address this message
(unless it's a TexasCavers list post)
came from, but for long-term use, save:
Personal: bmi...@alumni.uchicago.edu
AMCS: a...@mexicancaves.org or sa...@mexicancaves.org

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[Texascavers] Bob Thrun, not Thren

[Sam Young]

I thought that perhaps Shrewsbury had misspelled the name.  I inquired 
and received this reply:


/Hi Sam, It is Bob Thrun, of Maryland, and a caver who primarily pushed 
stuff in West Virginia. Bob Thren, as you know, is another person. Wm/


Now, does anyone know whatever happened to Bob Thren?  He was from 
Pennsylvania, I think.
/... Sam/
//

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Re: [Texascavers] NSS download speed

[Charles Goldsmith]

Bill, 2MB/sec is 2 megabytes per second, or 16 megabits/second.  Older wifi
(802.11b) has a theoretical max of 11 megabits/second, but you can rarely
get that high.  Newer wifi (802.11g - 54mbit, n - 600mbit, ac - 1300mbit)
can go higher, but there are a lot of things that can interfere, especially
other wifi access points, but things in the area can also, walls,
electrical devices, cordless phones.

The NSS website is not the fastest, a lot of the images are large and high
quality, and it's noticeable on slower connections.  Faster networks don't
notice it at all.

Feel free to reach out to me if you think something is amiss though, I'll
be happy to troubleshoot with you.

Charles
wo...@justfamily.org
ad...@caves.org


On Wed, Mar 1, 2017 at 2:15 PM, Mixon Bill  wrote:

> Apologies to Alex and the rest of the NSS web team. When I criticized the
> speed of the NSS server, I wasn't aware that I had not completely revised
> my Internet access to my new place, and it had defaulted to a slower Wi-Fi
> when I restarted computer. Still, there is some hangup somewhere between me
> and Atlanta, but at least I am now getting average 2MB/sec from NSS. (I
> hope that's megabytes, not megabits--nobody ever says.)
>
> At this apartment, my computer finds a choice of twenty-five Wi-Fi
> choices, but all of them are password-protected, of course. At my house, I
> couldn't pick up any but my own. -- Mixon
> 
> Nature is a hanging judge.
> 
> You may "reply" to the address this message
> (unless it's a TexasCavers list post)
> came from, but for long-term use, save:
> Personal: bmi...@alumni.uchicago.edu
> AMCS: a...@mexicancaves.org or sa...@mexicancaves.org
>
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[Texascavers] NSS download speed

[Mixon Bill]

Apologies to Alex and the rest of the NSS web team. When I criticized the speed 
of the NSS server, I wasn't aware that I had not completely revised my Internet 
access to my new place, and it had defaulted to a slower Wi-Fi when I restarted 
computer. Still, there is some hangup somewhere between me and Atlanta, but at 
least I am now getting average 2MB/sec from NSS. (I hope that's megabytes, not 
megabits--nobody ever says.)

At this apartment, my computer finds a choice of twenty-five Wi-Fi choices, but 
all of them are password-protected, of course. At my house, I couldn't pick up 
any but my own. -- Mixon

Nature is a hanging judge.

You may "reply" to the address this message
(unless it's a TexasCavers list post)
came from, but for long-term use, save:
Personal: bmi...@alumni.uchicago.edu
AMCS: a...@mexicancaves.org or sa...@mexicancaves.org

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Re: [Texascavers] lidar in caves

[Pete Lindsley]

Not only has Joe done work in Texas, he has also come out to NM to assist our 
teams in Fort Stanton Cave where we made him wade through some water and mud to 
get back to Don Sawyer Memorial Hall, about a mile into the cave. His 3D data 
has complimented the 3D mesh of sections of the cave where we have been slowly 
building a 3D simulation of both the historic parts of the cave and also a 
section of Snowy River. Ron Lipinski started the Caver Quest simulation work 
five years ago and we have graduated from the original Suunto cave survey 
without a mesh to two generations of LIDAR instruments made by Bob Buecher. We 
have significantly shortened the original process both with the LIDAR hardware, 
the photography panoramas and the computer processing techniques. Exact 
photography in some of the most interesting areas is augmented by "generic 
wallpaper" for some stretches of cave passage where logistics of the LIDAR 
units are not yet appropriate. Use of the Buecher LIDAR units in the cave is 
more like using a transit on a tripod and the units generate the 3D mesh out to 
20-25 meters from the tripod. Bob's latest LIDAR unit is smaller, lighter and 
more rugged than my old K transit.

If  you are interested, here is a link to the web page where you can download 
Caver Quest for PCs or Macs: [http://FSCSP.org/CQ6/].

 - Pete

On Mar 1, 2017, at 9:15 AM, Mixon Bill wrote:

The March NSS News, now newly available to NSS members at caves.org, has an 
article about using conventional LIDAR data to survey a cave. A considerably 
easier way to do that is described in an article in the Journal of Cave and 
Karst Studies at 
https://caves.org/pub/journal/PDF/v76/cave-76-03-191.pdf .
However, the article is from Australia, and I don't know that the equipment or 
software are available in the US. -- Mixon

Nature is a hanging judge.

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(unless it's a TexasCavers list post)
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Re: [Texascavers] lidar in caves

[joe-evelynn]

I've been LIDAR scanning caves here in Texas for the past 3 years with the 
Caveatron. Like the system in the article, you scan while moving through the 
cave rather than on a tripod, plus the Caveatron is like the DistoX in that you 
also use it to collect your survey data. The Australian system does have much 
higher resolution than the Caveatron and uses a very clever scanning method, 
but is 10-20 times as expensive (thousands of dollars) and requires dragging a 
laptop in a backpack around with you to operate the instrument, which is not 
the most practical thing in most caves around here! 

If anyone is interested in learning more about the Caveatron, here is the 
article that appeared in the June 2015 Texas Caver:
https://app.box.com/s/kxjl44tmn95n0vfaelmnisc19vwpp2ts

I currently have a couple of prototype systems built and if anyone is 
interested in borrowing one to try out, please let me know.

Joe Mitchell
joemitch...@satx.rr.com


 Mixon Bill  wrote: 
> The March NSS News, now newly available to NSS members at caves.org, has an 
> article about using conventional LIDAR data to survey a cave. A considerably 
> easier way to do that is described in an article in the Journal of Cave and 
> Karst Studies at 
https://caves.org/pub/journal/PDF/v76/cave-76-03-191.pdf .
However, the article is from Australia, and I don't know that the equipment or 
software are available in the US. -- Mixon

Nature is a hanging judge.

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(unless it's a TexasCavers list post)
came from, but for long-term use, save:
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[Texascavers] lidar in caves

[Mixon Bill]

The March NSS News, now newly available to NSS members at caves.org, has an 
article about using conventional LIDAR data to survey a cave. A considerably 
easier way to do that is described in an article in the Journal of Cave and 
Karst Studies at 
https://caves.org/pub/journal/PDF/v76/cave-76-03-191.pdf .
However, the article is from Australia, and I don't know that the equipment or 
software are available in the US. -- Mixon

Nature is a hanging judge.

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(unless it's a TexasCavers list post)
came from, but for long-term use, save:
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[Texascavers] FW: Brown Bag Presentation - Mustafa Saribudak and Alf Hawkins will talk on Geophysical Imaging of Critical Zone of Trinity/Edwards over Haby Fault of the Balcones Fault Zone, Wednesday,

[Geary Schindel]

FYI, sorry for the short notice.

Geary


Edwards Aquifer Philosophical Society -

aka brown bag luncheon


Wednesday, March 1, 2017 at 11:55 A.M.



Geophysical Imaging of the Critical Zone of Trinity/Edwards Aquifer over the 
Haby Fault,
Balcones Fault Zone, Texas, USA

By Dr. Mustafa Saribudak and Alf Hawkins
Environmental Geophysics Associates, Austin, Texas


At

Edwards Aquifer Authority
Training Room
900 E Quincy Street, San Antonio, TX 78215



Dr. Mustafa Saribudak and Mr. Alf Hawkins  are with Environmental Geophysics 
Associates. They will present a talk titled "Geophysical Imaging of Critical 
Zone of the Trinity/Edwards Aquifer over Haby Fault, Balcones Fault Zones, 
Texas, USA." The presentation will occur on Wednesday, March 1, 2017 from 11:55 
A.M. to 12:55 P.M. in the Training Room at the Edwards Aquifer Authority, 900 
E. Quincy Street, San Antonio, Texas. These are informal presentations so 
please feel free to bring your lunch. You may also contact the EAA at 
210.222.2204 or www.edwardsaquifer.org for 
additional directions.

If you are traveling a long distance for the talk, I would recommend that you 
call our receptionist at 210.222.2204 that morning to make sure that the talk 
is still scheduled.  On very rare occasions, we have had to cancel or move the 
talk.  I apologize for any inconvenience this may cause.

Abstract


Geophysical surveys (resistivity and natural potential (NP)), also called 
self-potential, were conducted across the Haby fault, which is located in the 
eastern Medina County of San Antonio, Texas. The fault is located within the 
Balcones Fault Zone, a recharge zone, which is a 25- to 30- km -wide en echelon 
system of mostly south-dipping normal faults that formed during the middle to 
late Tertiary. The Balcones Fault Zone includes the Edwards and Trinity 
Aquifers, which both are primary sources of water for south-central Texas 
communities, including the city of San Antonio. The Trinity Aquifer underlies 
the Edwards Aquifer through the Balcones Fault Zone. The Upper Glen Rose member 
is considered to be the Upper Trinity Aquifer, and also a confining zone 
underlying the Edwards Aquifer. However, recent geological studies have 
documented a hydraulic connection between the Edwards and Upper Trinity 
Aquifers: The upper-most portions of the Upper Trinity and the Edwards Aquifer, 
in some places, operate as a single aquifer system. The purpose of these 
geophysical study, thus, was to test this hypothesized connection, and to 
determine locations of karst anomalies (caves, subsidence, conduits, and 
faults/fractures) on either side (up and downthrown) of the Haby fault, and 
evaluate the fault in terms of its significance on the Glen Rose (Trinity) and 
Edwards Aquifer unit's interconnectivity (T-E) (Critical Zone!).


Four resistivity and two NP surveys with different electrode spacing (20, and 
33 feet) were conducted across the Haby fault, which juxtaposes the Lower 
Edwards Aquifer unit with the younger Upper Cretaceous rocks of the Eagle Ford 
Formation with a ~300 feet throw. The resistivity data with the 33 feet (10 m) 
electrode spacing displays the Glen Rose and the Edwards Aquifer boundary at 
about ~300 feet below the surface, and also maps the fault location precisely. 
In addition, Edwards Aquifer units are observed on both sides of the fault on 
one of the resistivity imaging which allows for estimating the vertical throw 
on the fault. To authors' knowledge, this is the only resistivity work that has 
ever been applied to reveal the nature of the T-E critical zone across a major 
fault or anywhere else over the Edwards Aquifers.

Biography


Mustafa Saribudak is the principal of Environmental Geophysics Associates 
(EGA). He holds a Master's in geology and a PhD from the Istanbul Technical 
University in Turkey. He worked for Tierra Environmental between 1990 and 1993 
in Houston, where he pioneered application of geophysical methods to 
environmental problems. He founded EGA in 1994 to provide near-surface 
geophysical services for engineering, environmental, and oil and gas 
industries, and real estate developers. During the last 20 years he has 
conducted geophysical surveys successfully at more than 300 sites in the U.S 
and Central America. He has published numerous papers and short notes in 
geophysical and environmental journals."


Alf Hawkins graduated from SWTSU in Remote Sensing & Photogrammetry in 1979 and 
started worked in Airborne Geophysics. Followed by marine and groundborne 
systems. He read Mustafa's paper about Micromagnetics 25 years ago and shorty, 
afterward started working with him. Our first project together was defining the 
extent of a cave system. And now, hundreds of Geo Adventures later, are still 
having fun providing solutions . Alf is a Texas P.G. in geophysics.

Thank you.

Geary

[Texascavers] geophysical methods ans Edwards Aquifer

[Mixon Bill]

The NSS web site has a new webinar titled "Geophysical applications to the 
karst of the Edwards Aquifer, Texas" at
http://caves.org/webinars/index-6.shtml#Geo (to view)
http://caves.org/webinars/Geophysical_Applications-1.mp4 (download 275 MB--will 
take a while; NSS has a slow server)

It is by Mustafa Saribudak and a hour and a half long. I haven't watched it. -- 
Mixon

Nature is a hanging judge.

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(unless it's a TexasCavers list post)
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