Author Topic: 4.5 Earthquake Hits Northern Oklahoma  (Read 2055 times)

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Offline Bunty

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4.5 Earthquake Hits Northern Oklahoma
« on: July 27, 2015, 07:56:56 PM »
This quake centered near the small town of Crescent, population 1500.  So not many people felt it's full effect.  But it was unusually strong,  strong enough to be a top ten one for strength in Oklahoma and was felt in Oklahoma City and Tulsa.  To me, it was a rare, silent earthquake.  All I sensed was a slight dipping sensation, like on a plane.

http://www.koco.com/news/crescent-grocery-store-shakes-after-45-quake/34381244

http://kfor.com/2015/07/27/oklahoma-residents-take-to-social-media-to-report-earthquake/

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Offline Wtronics

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #1 on: July 27, 2015, 09:33:30 PM »
Bunty,

I have a home built seismograph and it does not normally pickup the earthquakes in your area with any clarity - but this quake shows exceptionally well on my seismograph. I live near San Francisco, CA.

Remember I am picking up micro-vibrations that have traveled 1200 miles and I still see them fairly well as you can in the attached seismograph. There is about an 8 minute delay between the event and my seismograph signal. This signal did happen to fall at a quiet time on my seismograph.

The information in the upper left corner box is from USGS.

Offline Bunty

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #2 on: July 28, 2015, 01:29:23 AM »
Interesting.  Thanks for sharing.  I continue to hope the stronger quakes like 4.0 or greater don't center any closer to home.  A 3.5 quake under the city limits can be frightening enough.  The quakes have been increasing in frequency in recent days but still well off from highest rates it's been up to before.  This story shows the damage the quake done to a column for the front porch of a home in Crescent:  http://www.news9.com/story/29645306/crescent-homeowner-gets-more-than-rumblings-from-45-magnitude-earthquake
« Last Edit: July 28, 2015, 01:42:14 AM by Bunty »

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Offline WeatherHost

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #3 on: July 28, 2015, 07:07:08 AM »
Quote
The rate of earthquakes in Oklahoma has increased by about 50 percent since 2013, greatly increasing the chance for a damaging quake, according to the USGS.

Noticeable quakes - above magnitude 3.0 - now hit the state at a rate of two per day or more, compared with two or so per year prior to 2009. During the past seven days, Oklahoma has experienced about 40 earthquakes, according to the USGS.

http://www.reuters.com/article/2015/07/28/usa-oklahoma-quakes-idUSL1N10806F20150728

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Offline Bunty

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Offline Wtronics

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #5 on: July 28, 2015, 04:18:13 PM »
I realize the subject of the Oklahoma earthquakes is not weather related but it can be a very scary subject for the residents in the area...lets just call it earth sciences. People who have no interest can just move on to the next topic in this forum.

I live 7 miles from the San Andreas fault and I experience M 2 to M 4 events fairly routinely. The modest swaying and cracking sounds of a 4.5 are normal here. But at one time in my life, I lived within 50 FEET of a major fault. One morning my wife and I felt a massive almost explosion effect to our building - my wife just starting crying. It was as if a truck had hit our building.

I expected the SF Bay area to be in ruins.

It was an M 2.4!

But I was 50 feet from the epicenter. I never recovered from that experience. A lot of earthquake energy can be driven straight up in some areas.

Our buildings here are built to massive, expensive, and complex earthquake standards. We are required to make some structural walls called "sheer walls" among other retrofits. The entire wall of the house or building is covered, top to bottom and side to side, with 3/4" plywood with large nails every 3 inches in every stud and plate. (nails tend to bend where screws tend to sheer)

I am deeply concerned that the Midwest is not prepared to adopt west coast earthquake standards for good reason - the cost would be in the billions with a B. A friend of mine living in Napa Valley, was living ON a fault line and a M 5.5 nearly destroyed his house. Deductible on earthquake insurance here is about $35,000 for an average house. He made the necessary repairs to his house but the repair cost debt eventually caused him to loose his very successful business and ruined his life.

Of all the earthquake seismographs from the Oklahoma area I have seen on my modest seismograph, the example I showed above is the largest I have ever seen.

I am extremely sympathetic to the "earthquake problem" in the midwest. I hope we can find a cause and a solution - to make this statement of mine as non-political as possible.


Offline WeatherHost

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #6 on: July 28, 2015, 05:17:48 PM »
The CA situation is natural, not controllable, well known having existed for centuries and let's just say people should not build in certain places.

The OK situation is man made, recent and could be stopped at any time.

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Offline Bunty

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #7 on: July 29, 2015, 01:15:56 PM »
The CA situation is natural, not controllable, well known having existed for centuries and let's just say people should not build in certain places.

The OK situation is man made, recent and could be stopped at any time.

As the Oklahoma earthquake grows in intensity:  http://www.okiefunk.com/node/1590

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Offline Bunty

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Offline Bunty

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Offline Harryca

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #10 on: October 10, 2015, 06:43:00 PM »
WOW!  Two M4's in one day.  That's incredible.  Any damage?

M4.5 - 5km WNW of Cushing, Oklahoma
http://earthquake.usgs.gov/earthquakes/eventpage/us10003mqq#general_summary

M4.4 - 18km SW of Medford, Oklahoma
http://earthquake.usgs.gov/earthquakes/eventpage/us10003mnu#general_summary
« Last Edit: October 10, 2015, 06:44:34 PM by Harryca »

Offline Mtn_man

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #11 on: October 10, 2015, 09:06:01 PM »
I'm running the Leuven-Template for my weather site.  I'm always surprised at the number of earthquakes in OK when I look at the earthquake activity page included in the template. 

Currently it is showing a cluster of 42 quakes in OK over the last 7 days.

Offline Bunty

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Re: 4.5 Earthquake Hits Northern Oklahoma
« Reply #12 on: October 10, 2015, 11:11:27 PM »
Some weeks earthquakes go a bit over 60 a week.

A stronger one than usual, 4.5 in magnitude hit Cushing late Saturday afternoon.  I was driving in Stillwater at the time and didn't sense it.  There were at least 6 after shocks.  I didn't sense them, either.  I've sensed three of them in the last month though.  One of them felt like the earth went through a sudden dip in the road.

http://www.wsj.com/articles/earthquake-shakes-cushing-okla-1444526445

http://stillwaterweather.com/okareaearthquakes.php
« Last Edit: October 10, 2015, 11:21:45 PM by Bunty »

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Offline Bunty

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