[time-nuts] tracking position & orientation

[Dave Daniel]

I lived near Lyons, CO for about 20 years. ISTR that there is a fault line in CO, I think on the western slope. 

DaveD

Sent from a small flat thingy

> On Nov 22, 2019, at 02:36, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> eric at scace.org said:
>>   I moved to Boulder CO a few months ago. The “curiosity” is to determine
>> the position of two antennas at either end of my house and monitor it over
>> time, with the idea that one could see plate movement in 3 dimensions plus
>> rotation around the axes. 
> 
> How much does Boulder move?  I'd guess not much so measuring motion will be 
> tough.  You could try to get a lower limit on the speed.
> 
> Looks like that part of the country is not interesting to the USGS:
>  https://earthquake.usgs.gov/monitoring/gps
> 
> Ballpark numbers.
>  With a good setup, GPS gives location to about 1 mm.
>  I live a few miles from the San Andreas fault system.  It is shifting about 
> as fast as your fingernails grow, roughly an inch per year.
> 
> Measuring rotation will be tough if your 2 stations are only 100 ft apart.  Do 
> you have a friend 1, 10, or 100 miles away?
> 
> PS: Make sure that your antenna mounts are sturdy.  You don't want them 
> drifting as the house ages or you bump into them.
> 
> ----------
> 
> There is a major USGS campus on the Boulder side of Denver.  You might wander 
> down there and ask around to see if you can find anybody familiar with either 
> GPS or earthquakes.  Or try their web pages.  There is probably a public 
> information contact.
> 
> ----------
> 
> From a USGS talk tonight on Sea Level Rise.
>  California is rising about 2 mm per year.  Sea level is rising about 3 mm 
> per year.  Net is 1.
>  East coast is sinking about 3 mm per year.
>  (Major risk is surge and waves from hurricanes.)
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
> 
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