[TowerTalk] [Bulk] Re: Tower Stress in a quake?
Grant Saviers
grants2 at pacbell.net
Mon Jul 27 16:49:30 EDT 2015
The PE work for my guyed tower included a seismic analysis. A summary
showed the lateral seismic load as 567 lbs and the 90mph wind load as
3858 lbs. So in my case, wind load far exceeds seismic excitation and
is the controlling load for the analysis. YMMV.
If you want to worry about quakes and tsunami, move to the OR or WA
coast. Check out the July 20 issue of the New Yorker or this link
http://www.earthmagazine.org/article/unlocking-cascadia-subduction-zones-secrets-peering-recent-research-and-findings
or volcano induced lahars - goodbye Tacoma, Puyallup, Renton and more
from a Mt Rainier eruption.
Grant KZ1W
Seattle/Redmond WA
On 7/27/2015 13:05 PM, Mike & Becca Krzystyniak 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 at contesting.com] 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 at centurylink.net>
> 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 at arrl.net> 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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>>>
>>> _______________________________________________
>>
>>
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