Tennessee Weather Forum

Geology => Geology => Topic started by: bugalou on April 24, 2019, 04:59:19 PM

Title: New Madrid Seismic Zone Activity
Post by: bugalou on April 24, 2019, 04:59:19 PM
New Madrid Seismic Zone Activity

(https://i.imgur.com/K46OC0J.png)



https://earthquake.usgs.gov/earthquakes/eventpage/nm60268341/executive

Anyone feel it? I was asleep.

Edit: two smaller quakes occurred earlier this week in a addition to the one mentioned above all around Dyersburg. Hopefully it's not the start of a swarm.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: BRUCE on April 24, 2019, 06:39:20 PM
https://earthquake.usgs.gov/earthquakes/eventpage/nm60268341/executive

Anyone feel it? I was asleep.

Edit: two smaller quakes occurred earlier this week in a addition to the one mentioned above all around Dyersburg. Hopefully it's not the start of a swarm.
i did...
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: cgauxknox on April 24, 2019, 07:29:23 PM
Given that we're talking about the New Madrid fault zone I'd gladly take a swarm of small ones over a big one.  Any time stuff shakes out there it makes me nervous even all the way over here in Knoxville!
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: schneitzeit on April 24, 2019, 08:16:11 PM
Apocalypse!!!!!!1!!

 ::panic::
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: mamMATTus on April 24, 2019, 08:20:51 PM
Could be a foreshock...I doubt it. These bigger one's happen from time to time enough to remind everyone that the NMSZ exists, but I wouldn't worry too much about it. There was a 3.5 I think within the last couple of years. My QuakeFeed app goes off several times a week with 1.0-2.0's in the New Madrid area.

There will never be a warning. You might be lucky enough to be in the right place at the right time to see odd animal behavior en masse, but that's assuming you put 2&2 together within a decent amount of time. Maybe you're out in a field and happen to witness some sand blow activity...that would definitely be a sign and you would want to get the **** outta there before the ground liquefied.

I'm rambling as I think back to pursuing and attaining that BS in Geology 4 years ago.

Just a friendly reminder that the NMSZ is overdue by 30-50 years for another sizable quake. If that happens you will want to stock up on everything very fast as the transportation issues it will cause will be extreme regionally and moderate at the national level.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: schneitzeit on April 24, 2019, 09:36:35 PM
Quote
Maybe you're out in a field and happen to witness some sand blow activity...that would definitely be a sign and you would want to get the **** outta there before the ground liquefied.   

Could you explain this phenomenon in greater detail?

Thanks!


ETA: Basically, what is "sand blow" activity?
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: NismoWx on April 25, 2019, 05:19:49 AM
Could you explain this phenomenon in greater detail?

Thanks!


ETA: Basically, what is "sand blow" activity?
It's like a geyser, but with sand instead of water. In 1811/1812, they were observed in the crop fields at random before and after the big ones. There was so much pressure underground that it had to come out.

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Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: NismoWx on April 25, 2019, 05:43:45 AM
https://youtu.be/GTpznF4vr1Q short video on sand blow formation.

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Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: JayCee on April 25, 2019, 10:10:25 AM


There will never be a warning.

Just a friendly reminder that the NMSZ is overdue by 30-50 years for another sizable quake.

I'm reminded of all the hype before the last eclipse about the next one coming up in 2024 crossing the path of the 2017 eclipse and placing an X right over the NMSZ.  I'm not the superstitious type, but it does make me sit up and take notice.  Two eclipses crossing paths within 7 years of each other isn't something that happens every century. 

(http://endoftheamericandream.com/wp-content/uploads/2017/03/Solar-Eclipse-In-2017-And-Another-7-Years-Later-In-2024-Will-Mark-A-Giant-X-Across-The-United-States-460x290.png)
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: NismoWx on April 25, 2019, 10:17:20 AM
I'm reminded of all the hype before the last eclipse about the next one coming up in 2024 crossing the path of the 2017 eclipse and placing an X right over the NMSZ.  I'm not the superstitious type, but it does make me sit up and take notice.  Two eclipses crossing paths within 7 years of each other isn't something that happens every century. 

(http://endoftheamericandream.com/wp-content/uploads/2017/03/Solar-Eclipse-In-2017-And-Another-7-Years-Later-In-2024-Will-Mark-A-Giant-X-Across-The-United-States-460x290.png)
I'm listening.

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Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on April 25, 2019, 10:44:32 AM
Some of you are old enough to remember this name...

Dr. Iben Browning.

;)

Dec 3, 1990... good times.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on April 25, 2019, 11:08:40 AM
Some of you are old enough to remember this name...

Dr. Iben Browning.

;)

Dec 3, 1990... good times.

I like the guy, he got me out of school for a day in 3rd grade.

Looks like there was another small quake this morning nearby in MO.  https://earthquake.usgs.gov/earthquakes/eventpage/nm60268696/executive
Nothing really to worry about IMO, but this is the most activity I have noticed for the area in a 7 day period in a while
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: memphishogfan on April 27, 2019, 12:32:17 PM
Living in NEA If freaks me the freak out to think the next big one could hit at any moment. 

There is a little town east of Manila called Dell.  No more than a few blocks.  A fishing buddy was higher up at Entergy and was in a lot of disaster prep meetings.  He says they were told if another big one hits the area from Big Lake to just east of Dell would be gone.

There is a large cavern under that area that holds water and the earth above that cavern is mostly sand and isnít very deep. 

There are old sand blows all over the place up here.

I keep being cheap and avoiding an earthquake rider to my homeowners but I need to get that added at some point.

Post Merge: April 27, 2019, 12:54:26 PM
Quote
At least three other large aftershocks are inferred from historical accounts on December 16 and 17. These three events are believed to range between M6.0 and 6.5 in size and to be located in Arkansas and Missouri. This would make a total of seven earthquakes of magnitude M6.0-7.5 occurring in the period December 16, 1811 through February 7, 1812. In total, Otto Nuttli reported more than 200 moderate to large aftershocks in the New Madrid region between December 16, 1811, and March 15, 1812: ten of these were greater than about 6.0; about one hundred were between M5.0 and 5.9; and eighty-nine were in the magnitude 4 range. Nuttli also noted that about eighteen hundred earthquakes of about M3.0 to 4.0 during the same period.

I canít imagine 1800 3.0-4.0 quakes over the course of 4 months along with the other 200 larger ones.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on April 27, 2019, 01:54:01 PM
Living in NEA If freaks me the freak out to think the next big one could hit at any moment. 

There is a little town east of Manila called Dell.  No more than a few blocks.  A fishing buddy was higher up at Entergy and was in a lot of disaster prep meetings.  He says they were told if another big one hits the area from Big Lake to just east of Dell would be gone.

There is a large cavern under that area that holds water and the earth above that cavern is mostly sand and isnít very deep. 

There are old sand blows all over the place up here.

I keep being cheap and avoiding an earthquake rider to my homeowners but I need to get that added at some point.

Post Merge: April 27, 2019, 12:54:26 PM
I canít imagine 1800 3.0-4.0 quakes over the course of 4 months along with the other 200 larger ones.

Get earthquake insurance on your home!  Even a small earthquake can do very costly damage to the structure of your home.  I have it on my home and it only raised my policy price by about 275 bucks annually.  Money well spent to know I can fix my house if a decent sized quake ever struck us.

Post Merge: April 27, 2019, 01:59:23 PM
More smaller quakes have occurred over the past 72 hours.  This is the most active 7 days I have seen in sometime. 

(https://i.imgur.com/t2yGUdV.jpg)
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on May 22, 2019, 10:21:30 AM
NMSZ continues to be more busy than average.  Its something I will certainly be keeping an eye on.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on May 28, 2019, 02:37:40 PM
Another 2.7 yesterday.  If you don't have earthquake insurance now may be a good time.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: cgauxknox on May 28, 2019, 03:51:26 PM
For those of you with earthquake insurance who do you use?  Our insurance company, who we really like and covers our home and cars, doesn't offer an option for earthquake coverage.  Yes, I'm in East TN and realize the odds of damage are small, but we're in an older brick home and it wouldn't take much of a rattle to really do expensive damage.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: mamMATTus on May 28, 2019, 04:50:38 PM
Gotta be honest, with the increased frequency of these quakes Iím starting to think that the big one isnít far off. I donít know of any fracking going on in this area that I could point the finger at as a cause.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Charles L. on May 28, 2019, 05:04:06 PM
Gotta be honest, with the increased frequency of these quakes Iím starting to think that the big one isnít far off. I donít know of any fracking going on in this area that I could point the finger at as a cause.

I am having that same feeling.

Not saying we are going to see anything quite like 1812, but a solid 5.5-6.5 or something like that wouldnít surprise me in the least.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on May 28, 2019, 06:35:02 PM
I am having that same feeling.

Not saying we are going to see anything quite like 1812, but a solid 5.5-6.5 or something like that wouldnít surprise me in the least.
This is exactly what I told my wife the other day. I doubt a 7+ earthquake is going to happen by 5 to 6 is actually a real good possibility.  That is enough to do a lot of costly damage to peoples homes and businesses.

I use ameriprise for my home insurance and they offer earthquake policies.

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Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: mamMATTus on June 01, 2019, 02:12:14 PM
2.6 in Manchester about 30 minutes ago. It should have been felt considering it was almost right at the surface. Iím sure a few things have been knocked off of walls
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 01, 2019, 09:18:14 PM
2.6 in Manchester about 30 minutes ago. It should have been felt considering it was almost right at the surface. Iím sure a few things have been knocked off of walls

Not all that far from one of a similar size that occurred toward Shelbyville back in January. Weird that a couple of these tremors have occurred in Middle TN in recent months... to say nothing of the swarm that has occurred in East TN and more recently the spike in activity on the NMFZ. What's going on here?
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 02, 2019, 06:37:14 AM
The one near Manchester was close to Arnold Air Force Base, and the depth looks like something at the surface. I wonder if that was an artificial cause.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: NismoWx on June 04, 2019, 05:55:08 AM
The one near Manchester was close to Arnold Air Force Base, and the depth looks like something at the surface. I wonder if that was an artificial cause.
Arnold AFB is a propulsion lab. They haven't used large ordnance like that in several years.

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Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: JayCee on June 04, 2019, 07:39:21 AM
I've not really kept up with the activity surrounding the NMSZ.  Is the current swarm anything unusual in terms of intensity/frequency? 
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 04, 2019, 08:11:01 AM
I've not really kept up with the activity surrounding the NMSZ.  Is the current swarm anything unusual in terms of intensity/frequency?

Nothing crazy on intensity yet, I don't think, but I think there is for sure an uptick in frequency.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: cgauxknox on June 04, 2019, 08:20:58 AM
[attachimg=1]
Arnold AFB is a propulsion lab. They haven't used large ordnance like that in several years.

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[attachment deleted by admin]
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: BRUCE on June 04, 2019, 10:18:50 AM
There are tremors around our parts of country everyday nearly actually ... been going on since forever...  itís just majority of them are so small weak they are hardly ever felt
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 04, 2019, 01:42:51 PM
There are tremors around our parts of country everyday nearly actually ... been going on since forever...  itís just majority of them are so small weak they are hardly ever felt

Yeah- but, this is an increase in activity. Sometimes, that can be a precursor for larger events, but not always (or even usually).
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: bugalou on June 06, 2019, 03:43:36 PM
There are tremors around our parts of country everyday nearly actually ... been going on since forever...  itís just majority of them are so small weak they are hardly ever felt

I check earthquakes weekly because I am a geology nerd too and things have been busier than normal over the past 3 months with small quakes.  They could very well be fore/aftershocks from the 3.7 one.  We are about 20 years over due for a 5 - 6.5 event here though.
Title: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 06, 2019, 10:15:42 PM
And now one in KY near Paducah...

https://fox17.com/news/local/24-earthquake-reported-in-kentucky

Iím having trouble finding this on recent activity outside of this article.
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Brandon on June 10, 2019, 05:32:53 PM
Another this morning near Loretto Tn. 2.2
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: cgauxknox on June 11, 2019, 07:53:31 PM
1.6 under Tellico Lake followed by a 2.2 in Sweetwater,  both this morning.   https://www.wate.com/news/local-news/22-magnitude-earthquake-recorded-outside-sweetwater/2068950474
Title: Re: 3.7 Earthquake near Dyersburg this morning
Post by: Thundersnow on June 12, 2019, 03:36:40 AM
There was also one in north Alabama.

Not sure if some of this is normal activity that weíre just noticing because weíre paying attention, but in addition to the uptick in frequency, it seems like weíre seeing tremors show up in places that donít normally have them.
Title: Re: New Madrid Seismic Zone Activity
Post by: bugalou on July 11, 2019, 02:06:52 PM
Generated this this other day.  This is activity since April 2019 for NMSZ.  92 total earthquakes.  Activity has certainly ticked up as of late.  Hopefully they stay weak like this!

(https://i.imgur.com/494F1qx.jpg)
Title: Re: New Madrid Seismic Zone Activity
Post by: mamMATTus on August 26, 2019, 10:10:13 AM
Several small quakes in the Reelfoot Lake/Ridgely area over the last 24 hours.
Title: New Madrid Seismic Zone Activity
Post by: Thundersnow on August 26, 2019, 12:54:53 PM
Several small quakes in the Reelfoot Lake/Ridgely area over the last 24 hours.

Interesting. I donít have the fault system layout in front of me- but thatís right around the intersection point of two legs of the fault zone in terms of where events are recorded along linear axes.... one that is oriented NE to SW and the other oriented NW to SE.
Title: Re: New Madrid Seismic Zone Activity
Post by: bugalou on September 03, 2019, 01:24:19 PM
Interesting. I donít have the fault system layout in front of me- but thatís right around the intersection point of two legs of the fault zone in terms of where events are recorded along linear axes.... one that is oriented NE to SW and the other oriented NW to SE.

It makes a tilted backwards "Z" with what you are talking about being the southern vertex. 

(http://www.showme.net/~fkeller/quake/images/ualrmap1.jpg)

There are vertically large plutons (huge monolithic chunks of igneous rock) on the western side of these faults that are sinking into the mantle at a greater rate than the surrounding crust.  This is what puts the stress on the fault system and why there is no trackable movement of the fault at the surface.  There have been some recent studies showing some slow vertical movement upwards on Crowley's ridge but the mechanisms in play are not well understood at this time.  This may allude to it being involved some how in the system and not just an left over alluvial island as previously proposed.  That said that is on the bleeding edge of research and hotly contested.

Areas shaded are the maps of the plutons:
(http://www.showme.net/~fkeller/quake/images/reelfootrift.gif)

There is also a newly found fault that runs parallel to the reelfoot rift shown above, but about 50 miles to the south and runs under the MS river around Memphis. It can and has cause quakes but is much more quiet than the fault to the north.
Title: New Madrid Seismic Zone Activity
Post by: Thundersnow on September 03, 2019, 01:50:42 PM
I always thought Crowleyís Ridge was an interesting feature. Itís such a linear ridge that rises out of the alluvial plain. Itís an interesting thing to come across when driving across the flatness of eastern AR.

I recall reading theories about it anything from a ďbank/bluffĒ left over from some ancient placement of the river system to perhaps some effect of the NMFZ.
Title: Re: New Madrid Seismic Zone Activity
Post by: bugalou on September 03, 2019, 02:56:08 PM
I always thought Crowleyís Ridge was an interesting feature. Itís such a linear ridge that rises out of the alluvial plain. Itís an interesting thing to come across when driving across the flatness of eastern AR.

I recall reading theories about it anything from a ďbank/bluffĒ left over from some ancient placement of the river system to perhaps some effect of the NMFZ.

The current accepted theory is the MS river us to flow west of it and then moved east and this was just the only un-erroded portion of t he land life.  There is species of plants and animals there that are the same or related to species in east TN and northern AL so that backs up the theory.  The part that ties into the NMFZ is speculation if this was a naturally high area some how related to it, or if it was just leftover from some period in the past and has nothing to do with it.
Title: Re: New Madrid Seismic Zone Activity
Post by: Thundersnow on September 03, 2019, 06:37:44 PM
I also remember that about the wildlife... apparently the flora and fauna on the ridge have more in common with the hills of TN than they do the nearby Ozarks.
Title: Re: New Madrid Seismic Zone Activity
Post by: Curt on September 03, 2019, 06:55:49 PM
I also remember that about the wildlife... apparently the flora and fauna on the ridge have more in common with the hills of TN than they do the nearby Ozarks.

Itís the ONLY  place in Arkansas that has a deciduous cover thatís related an Appalachian deciduous that stops at the MS River.
Title: Re: New Madrid Seismic Zone Activity
Post by: bugalou on November 22, 2019, 09:33:16 PM
Below is an excellent paper on how an ancient sinking plate in the mantle may be part of the reason the NMSZ exists.  Worth a read if you are into this stuff.

https://www.researchgate.net/profile/Alessandro_Forte/publication/252126489_Descent_of_ancient_Farallon_slab_drives_localized_mantle_flow_below_the_New_Madrid_Seismic_Zone/links/53d562ff0cf220632f3d577a/Descent-of-ancient-Farallon-slab-drives-localized-mantle-flow-below-the-New-Madrid-Seismic-Zone.pdf
Title: Re: New Madrid Seismic Zone Activity
Post by: Thundersnow on December 02, 2019, 04:21:41 PM
FWIW- https://fox17.com/news/local/16-earthquakes-strike-tennessee-town-in-three-days
Title: Re: New Madrid Seismic Zone Activity
Post by: bugalou on December 03, 2019, 07:36:19 PM
FWIW- https://fox17.com/news/local/16-earthquakes-strike-tennessee-town-in-three-days

They have been small but these have been much more focused geographically speaking than what I normally see.  Something to watch for sure.

From last 7 days: 1.0+
(https://i.imgur.com/1oBBAwT.jpg)