Installing microwave radio systems for Harris Corporation over 20 years, I
had to obtain building permits for many new towers (eg. 100-300', both guyed
and self-supporting). The engineering calculations included stresses from
earthquakes as well as wind. The stress from wind on the guys and/or
foundation bolts was always 10x the forces exerted by earthquakes. If your
tower design is adequate for the winds in your area, I would not worry about
earthquake forces.
73,
Steve
N6SJ
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jon
Sent: Monday, July 27, 2015 1:35 PM
To: Mike & Becca Krzystyniak
Cc: TowerTalk; Steve Baughn; KK4CPS@gmail.com
Subject: Re: [TowerTalk] Tower Stress in a quake?
I live in the DFW area..had about one a day for about 2 months about 1.5
years ago.
you should not have an issue...
Think of all the big towers in California...how many of them have fallen due
to quakes ?
On Monday, July 27, 2015, Mike & Becca Krzystyniak <k9mk@flash.net> wrote:
> Recently the public outcry on this caused Irving TX area to have more
> sensors deployed to monitor what is going on (by TX-A&M I think...).
>
> http://earthquaketrack.com/us-tx-irving/recent
>
> All are at least 2X below the Barnett Shale (about 2.1km down), and
> more importantly, I'm not sure the shale makes it that far east.
> You have to admit looking at the data, something is going on...
>
> As I am moving to new QTH which is near the epicenter for the largest
> one recorded this year in NTX, I too am wondering about snapping tower
> guys under tension or that "bump" snapping a cable on the crank up.
>
> 73 Mike K9MK
>
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com
> <javascript:;>] On Behalf Of Matthew King - KK4CPS
> Sent: Monday, July 27, 2015 2:44 PM
> To: Steve Baughn
> Cc: Jon; TowerTalk
> Subject: Re: [TowerTalk] Someone's Tower Fall Over in OK?
>
> Those aren't exactly unbiased websites!
>
> The fact of the matter is that there will be debate for a long time
> over the issue. Until the incidence of earthquakes occurring AT
> FRACKING DEPTH goes up a meaningful amount, it will continue. Most
> earthquakes take place far, far deeper in the earth than fracking
> depth. As was stated earlier, there most be faults to allow plates to
> shift along one another for there to be a quake.
>
> Will we see more sinkholes around fracked areas? That seems a more
> likely outcome, if there is any negative outcome at all.
>
> My few pennies' worth.
>
> Matt
> KK4CPS
>
>
> On Mon, Jul 27, 2015 at 3:36 PM, Steve Baughn <baughn@centurylink.net
> <javascript:;>>
> wrote:
>
> > I think there are some differing opinions expressed here:
> > www.huffingtonpost.com/2014/04/11/ohio-earthquakes
> > www.rt.com/usa/fracking-ohio-quake-earth-165
> >
> > 73,
> > Steve, WD8NPL
> >
> >
> >
> > From: Jon
> > Sent: Monday, July 27, 2015 3:21 PM
> > To: Don W7WLL
> > Cc: Towertalk
> > Subject: Re: [TowerTalk] Someone's Tower Fall Over in OK?
> >
> > Earthquakes are not caused by fracking!
> >
> > Recently had several studies done here in DFW area because of this
> > very topic. We had over 30 tremors with 40 days... Fracking is a 2
> > -
> > 5 day event at a well to fracture the shale at the level where they
> > are extracting oil and/or gas. Most of these happen deeper than
> > those
> wells.
> > It is possibly related to injection wells as was likely the causes here.
> > Either way there has to be a fault that slips to create the quake.
> > 4.5 is noticable quake. You can feel a 2.5 - 3.2 feels like the
> > house got bumped.
> >
> >
> >
> > On Monday, July 27, 2015, Don W7WLL <w7wll@arrl.net <javascript:;>>
> wrote:
> >
> > Or the result of fracking? Know folks with towers in OK have to
> > contend
> >> with tornados at times, but earthquakes seem to be on an increase too?
> >> Wonder if anyone has ever encountered a tower-earthquake related
> >> issue in OK.
> >>
> >> Don W7WLL
> >>
> >> -----Original Message----- From: USGS ENS
> >> Sent: Monday, July 27, 2015 11:41 AM
> >>
> >> Subject: 2015-07-27 18:12:15 (M4.5) OKLAHOMA 36.0 -97.6 (122a9)
> >>
> >> == PRELIMINARY EARTHQUAKE REPORT ==
> >>
> >>
> >>
> >> Region: OKLAHOMA
> >> Geographic coordinates: 36.006N, 97.576W
> >> Magnitude: 4.5
> >> Depth: 3 km
> >> Universal Time (UTC): 27 Jul 2015 18:12:15
> >> Time near the Epicenter: 27 Jul 2015 13:12:15
> >> Local standard time in your area: 27 Jul 2015 10:12:15
> >>
> >> Location with respect to nearby cities:
> >> 6 km (3 mi) NNE of Crescent, Oklahoma
> >> 19 km (11 mi) NW of Guthrie, Oklahoma
> >> 40 km (24 mi) NNW of Edmond, Oklahoma
> >> 48 km (29 mi) WSW of Stillwater, Oklahoma
> >> 59 km (36 mi) N of Oklahoma City, Oklahoma
> >>
> >>
> >> ADDITIONAL EARTHQUAKE PARAMETERS
> >> ________________________________
> >> event ID : us 200030gd
> >>
> >> This is a computer-generated message and has not yet been reviewed
> >> by a seismologist.
> >> For subsequent updates, maps, and technical information, see:
> >> http://earthquake.usgs.gov/earthquakes/eventpage/us200030gd
> >> or
> >> http://earthquake.usgs.gov/
> >>
> >>
> >>
> >> DISCLAIMER:
> >> https://sslearthquake.usgs.gov/ens/help.html?page=help#disclaimer
> >>
> >>
> >>
> >> _______________________________________________
> >>
> >>
> >>
> >> _______________________________________________
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> >> TowerTalk@contesting.com <javascript:;>
> >> http://lists.contesting.com/mailman/listinfo/towertalk
> >>
> >> _______________________________________________
> >
> >
> >
> > _______________________________________________
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> >
> >
> >
> > _______________________________________________
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> > TowerTalk@contesting.com <javascript:;>
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> _______________________________________________
>
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