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1811-12 New Madrid EQs & Mt Carmel EQs Related

 
Is45
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04/22/2008 03:32 AM
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1811-12 New Madrid EQs & Mt Carmel EQs Related
So, I went poking around on Google search and
found this intro to a 2004 scientific article
about the New Madrid earthquakes of 1811/12.


Here is the critical part:


We infer that the remaining New Madrid mainshock may have occurred more than 200 km north of this region in the Wabash Valley of southern Indiana and Illinois—an area that contains abundant modern microseismicity, and where substantial liquefaction was documented by historic accounts. Our results suggest that future large mid-plate earthquake sequences may extend over a much broader region than previously suspected.


[link to www.nature.com]


!




The Wabash Valley is where the recent earthquakes have occurred.

[link to en.wikipedia.org]




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Is45 (OP)

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04/22/2008 03:36 AM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
!

Here is entire intro:



Nature 429, 284-288 (20 May 2004)


Analysing the 1811–1812 New Madrid earthquakes with recent instrumentally recorded aftershocks


Karl Mueller1, Susan E. Hough2 & Roger Bilham1,3

1. Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309-0399, USA
2. US Geological Survey, 525 South Wilson Ave, Pasadena, California 91030, USA
3. CIRES University of Colorado, Boulder, Colorado 80309-0216, USA

Correspondence to: Karl Mueller1 Email: Karl.Mueller@colorado.edu
Top of page
Abstract


Although dynamic stress changes associated with the passage of seismic waves are thought to trigger earthquakes at great distances, more than 60 per cent of all aftershocks appear to be triggered by static stress changes within two rupture lengths of a mainshock1, 2, 3, 4, 5. The observed distribution of aftershocks may thus be used to infer details of mainshock rupture geometry6. Aftershocks following large mid-continental earthquakes, where background stressing rates are low, are known to persist for centuries7, 8, and models based on rate-and-state friction laws provide theoretical support for this inference9. Most past studies of the New Madrid earthquake sequence have indeed assumed ongoing microseismicity to be a continuing aftershock sequence10, 11, 12. Here we use instrumentally recorded aftershock locations and models of elastic stress change to develop a kinematically consistent rupture scenario for three of the four largest earthquakes of the 1811–1812 New Madrid sequence. Our results suggest that these three events occurred on two contiguous faults, producing lobes of increased stress near fault intersections and end points, in areas where present-day microearthquakes have been hitherto interpreted as evidence of primary mainshock rupture. We infer that the remaining New Madrid mainshock may have occurred more than 200 km north of this region in the Wabash Valley of southern Indiana and Illinois—an area that contains abundant modern microseismicity, and where substantial liquefaction was documented by historic accounts. Our results suggest that future large mid-plate earthquake sequences may extend over a much broader region than previously suspected.



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Is45 (OP)

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04/22/2008 03:52 AM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
!

During the 1811-12 New Madrid series of EQs,
the fourth EQ in the series was the strongest.


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Is45 (OP)

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04/22/2008 04:14 AM
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!


I found a link to the entire article:

[link to 209.85.165.104]



Here is another excerpt:



With the assumption that the principal earthquakes of the 1811–
1812 New Madrid sequence constitute a progressively triggered
sequence, we conclude that primary faulting in the NMSZ occurred
as three ruptures on a linked strike–slip and thrust fault system. The
third mainshock, hitherto assigned to a lobe of microseismicity at
the north end of the thrust fault, may have been a triggered
earthquake more than 200 km northeast of New Madrid
in a region
of abundant ongoing microseismicity. We interpret diffuse arms of
microseismicity now occurring at the end points and intersections
of the two main New Madrid faults as aftershocks occurring in
regions where stress was increased by the mainshocks. Our
interpretation is consistent with established magnitude/fault area
results, and do not require exceptionally large fault areas or stress
drop values for the New Madrid mainshocks. Ironically, however,
the results of this study imply that the hazard associated with
mid-continent earthquakes might be more widely distributed
than previously recognized. That is, large dynamically triggered
remote earthquakes may follow large mid-plate mainshocks.




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Anonymous Coward
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04/22/2008 07:43 AM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
Good information. I guess time will tell on this one.
Is45 (OP)

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04/22/2008 12:06 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
Good information. I guess time will tell on this one.

 Quoting: Anonymous Coward 399063



Thanks... yes, time will tell.

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Is45 (OP)

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04/22/2008 02:23 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
!

April 22

2 mag EQ 8 miles from New Madrid, Mo

[link to earthquake.usgs.gov]


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Is45 (OP)

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04/22/2008 02:28 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
!

April 22

1.6 mag EQ near Mt Carmel Illinois.

[link to earthquake.usgs.gov]


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Anonymous Coward
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04/22/2008 02:32 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
I read the novel, "The Rift" by Walter Williams which details a modern earthquake along the New Madrid fault. The most interesting part of the book to me though are the first hand accounts written by people from 1812 that preceed each chapter. Some quite incredible accounts of personally observed earthquake related occurences in the region.
Is45 (OP)

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04/22/2008 06:19 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
I read the novel, "The Rift" by Walter Williams which details a modern earthquake along the New Madrid fault. The most interesting part of the book to me though are the first hand accounts written by people from 1812 that preceed each chapter. Some quite incredible accounts of personally observed earthquake related occurences in the region.

 Quoting: Anonymous Coward 33440



We may soon be getting some
incredible personally observed
accounts of our own !



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Is45 (OP)

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04/25/2008 02:30 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
!

Magnitude 4.2 - ILLINOIS

Friday, April 25, 2008 at 12:31:00 PM at epicenter

# 8 km (5 miles) NNE (25°) from Bellmont, IL
# 10 km (6 miles) WNW (294°) from Mount Carmel, IL


[link to earthquake.usgs.gov]

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Is45 (OP)

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06/05/2008 01:14 PM
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Re: 1811-12 New Madrid EQs & Mt Carmel EQs Related
~

Another Mt Carmel earthquake:


Magnitude 3.6 - ILLINOIS
2008 June 05
07 :13 :14 UTC

Earthquake Details
Magnitude 3.6
Date-Time

* Thursday, June 05, 2008 at 07: 13 :14 UTC
* Thursday, June 05, 2008 at 02: 13 :14 AM at epicenter
* Time of Earthquake in other Time Zones

Location 38.444°N, 87.839°W
Depth 5 km (3.1 miles) set by location program
Region ILLINOIS
Distances

* 7 km (4 miles) WNW (298°) from Mount Carmel, IL
* 9 km (6 miles) NE (43°) from Bellmont, IL
* 11 km (7 miles) NNE (14°) from Keensburg, IL
* 38 km (24 miles) SW (227°) from Vincennes, IN
* 58 km (36 miles) NNW (334°) from Evansville, IN
* 210 km (131 miles) E (95°) from St. Louis, MO


[link to earthquake.usgs.gov]


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