Carson City Earthquake X 3! Where's The Centroid?
A
cache
by Bernsports
Hidden:
2/3/2009
Size:
 (Regular)
Difficulty: 
Terrain: 
(1 is easiest, 5 is hardest)
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THIS CACHE IS NOT AT THE ABOVE COORDINATES: On the morning of
January 29th, 2009, Carson City was struck by 3 earthquakes. Most
of you never even knew about it as they were too small to be felt.
Regardless of that, they still happened. Once they were verified by
a seismologist, I plotted the epicenters on a topo map. These 3
epicenters were all in the SE part of Carson City.
By connecting the 3 epicenters, you can form a scalene triangle, so
instead of hiding a cache at all 3 locations(one of which was on
prison property), I decided to hide the cache at the Centroid of
the Triangle. Here are the coordinates of the 3 epicenters, and
from there you will be able to calculate the Centroid. Earthquake
#A was a 1.6 magnitude, and the weakest. It was located at N 39
06.120 W 119 44.040. Earthquake #B was 1.8 magnitude and it was
located at N 39 06.660 W 119 44.220. Earthquake #C was the
strongest at 2.1 magnitude and it was located at N 39 06.540 W 119
44.040. The difficulty rating is based on whether or not you have a
map with coordinates to be able to plot the 3 epicenters. A topo
map on a computer is the easiest way to do all the plotting. To
start finding the Centroid, you first need to measure the length of
each side of the Triangle. Since a 1 foot discrepancy from my
measurements compared to somebody else can make a big difference,
here is some assistance to get started. You will only need to be
within 100ft as I'll give you the last 2 digits of each
measurement. From Quake A to Quake B, it is _ _ 00ft. From Quake B
to Quake C, it is _ _ 20ft. From Quake C to Quake A, it is _ _
50ft. From there, you need to figure out the rest. Also, the ammo
can being used for this hide was won by me, at the dinner for the
GBES 2008 Navigational Rally (Yes, I am finally using it). In it, I
have placed the movie "10.5 Apocalypse"(an earthquake movie, of
course), tape measure, glow sticks, water proof match container,
Are You Smarter Than A 5th Grader card game, and a mini set of
screw drivers.
You can check your answers for this puzzle on
Geochecker.com.
Additional Hints (
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(Decrypted Hints)
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Logged Visits (
15 total.
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Warning.
Spoilers may be included in the descriptions or links.
Cache find counts are based on the last time the page generated.
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 September 19 by bthomas (13862 found)
Cached with Team Alamogul, on our way to an unevent and the Diabolical night cache. TFTPC!! The only centroid I know is my geocaching centroid near Area 51, Nevada.
[view this log] | September 19 by Alamogul (36753 found)
I must admit that I screwed up the solution as I first foung the point that was equidistant from each of the epicenters, but I was soon set straight and got a close-enough solution. Stopped by this evening with bthomas for the find, we also met the cache owner at the un-event this evening. Thanks for the fun
[view this log] |  September 3 by ogremlin (209 found)
Google Earth plotted the required points to within 25 feet.The surroundings look somewhat arid!
Any snakes?. Won't be able to search as I'm 5k miles to the E..'cheers' as we say.
[view this log] | June 4 by nvthrower (9 found)
Found it pretty much right where I calculated it to be. Good hide. TNLNSL
[view this log] | May 2 by sierradogs (795 found)
Seventh of seven finds on a blustery day. You do not need mapsource or any software to solve the math on this one, simply geometric reasoning and some arithmetic will provide the answer. Our coordinates were within 17 feet so that is spot on. TFTC
[view this log] | |
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Current time: 11/22/2009 3:18:34 AM
Last Updated: 9/23/2009 4:49:35 AM
Rendered: From Database
Coordinates are in the WGS84 datum
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