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Index » Regional/Local » Elsewhere » Earthquake Page: 1, 2, 3, 4, 5, 6  Next
Post to this Topic
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Mar 28, 2025 - 10:27pm

 kurtster wrote:

And the southern San Andreas as well.  Northridge was one vivid example.  1994 6.7 quake, combination slip / thrust fault event which is why the devastation was so much.

The most costly American earthquake since 1906 struck Los Angeles on 17 January 1994. The magnitude 6.7 Northridge earthquake resulted from more than 3 meters of reverse slip on a 15-kilometer-long south-dipping thrust fault that raised the Santa Susana mountains by as much as 70 centimeters. The fault appears to be truncated by the fault that broke in the 1971 San Fernando earthquake at a depth of 8 kilometers. Of these two events, the Northridge earthquake caused many times more damage, primarily because its causative fault is directly under the city. Many types of structures were damaged, but the fracture of welds in steel-frame buildings was the greatest surprise. The Northridge earthquake emphasizes the hazard posed to Los Angeles by concealed thrust faults and the potential for strong ground shaking in moderate earthquakes.


Ya, not the same. Different kind of fault. 1994 not the San Andreas. M6.7 a whole different beast from a M7.7. A southern SAF rupture will be severe.

kurtster

kurtster Avatar

Location: where fear is not a virtue
Gender: Male


Posted: Mar 28, 2025 - 9:32pm

 geoff_morphini wrote:
 We are better prepared but this earthquake is an analog event to a northern San Andreas scenario.
 
And the southern San Andreas as well.  Northridge was one vivid example.  1994 6.7 quake, combination slip / thrust fault event which is why the devastation was so much.

The most costly American earthquake since 1906 struck Los Angeles on 17 January 1994. The magnitude 6.7 Northridge earthquake resulted from more than 3 meters of reverse slip on a 15-kilometer-long south-dipping thrust fault that raised the Santa Susana mountains by as much as 70 centimeters. The fault appears to be truncated by the fault that broke in the 1971 San Fernando earthquake at a depth of 8 kilometers. Of these two events, the Northridge earthquake caused many times more damage, primarily because its causative fault is directly under the city. Many types of structures were damaged, but the fracture of welds in steel-frame buildings was the greatest surprise. The Northridge earthquake emphasizes the hazard posed to Los Angeles by concealed thrust faults and the potential for strong ground shaking in moderate earthquakes.
geoff_morphini

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Gender: Male


Posted: Mar 28, 2025 - 8:20pm

https://earthquakeinsights.sub...

Here is a summary with a little more detail. These authors are knowledgeable and reputable. They also write this blog for general consumption. Bottom line- this is a bad situation. This strike-slip fault is somewhat analogous to the San Andreas or Alpine (NZ) faults, same sense of motion and similar rates of slip. The fault creates a valley where everyone lives, thus, big population centers are directly over the earthquake. The hypocenter was shallow, less than 10 km, so little energy was attenuated. To add to the problem, the valleys are full of loose (unconsolidated) sediment and prone to liquefaction. The fault has historic, large earthquakes but the infrastructure was not up to standards for that kind of shaking and foundation strength loss. We are better prepared but this earthquake is an analog event to a northern San Andreas scenario.
R_P

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Gender: Male


Posted: Mar 28, 2025 - 4:06pm

3 things to know about the deadly Myanmar earthquake
The Sagaing Fault region has a long history of devastating earthquakes

A magnitude 7.7 earthquake that struck March 28 in neighboring Myanmar turned this building in Bangkok, Thailand, into a mountain of collapsed concrete and twisted rubble, and a gargantuan task for rescue workers.

geoff_morphini

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Gender: Male


Posted: Jan 8, 2025 - 1:07pm

 NoEnzLefttoSplit wrote:

divergent or convergent?



Both, depends on the day
ScottFromWyoming

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Location: Powell
Gender: Male


Posted: Jan 8, 2025 - 4:17am

 geoff_morphini wrote:

3. I’m retired but still active, dammit




NoEnzLefttoSplit

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Gender: Male


Posted: Jan 8, 2025 - 12:42am

 haresfur wrote:


I'M NOT DEAD YET!




haresfur

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Location: The Golden Triangle
Gender: Male


Posted: Jan 8, 2025 - 12:24am

 geoff_morphini wrote:

Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. I’m retired but still active, dammit



I'M NOT DEAD YET!
NoEnzLefttoSplit

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Gender: Male


Posted: Jan 8, 2025 - 12:04am

 geoff_morphini wrote:

Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. I’m retired but still active, dammit


divergent or convergent?

geoff_morphini

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Gender: Male


Posted: Jan 7, 2025 - 9:16pm

 ScottFromWyoming wrote:


BTW our Geomorph has retired, leaving Rob Thomas as the guy to follow. 
 A different Rob Thomas. 



Little known fact, 1. Rob and I came from the same program and have been friends for years, 2. He is a master educator (not a little known fact). 3. I’m retired but still active, dammit

ScottFromWyoming

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Location: Powell
Gender: Male


Posted: Jan 7, 2025 - 2:04pm

 Proclivities wrote:

BTW our Geomorph has retired, leaving Rob Thomas as the guy to follow. 
 A different Rob Thomas. 


Proclivities

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Location: Paris of the Piedmont
Gender: Male


Posted: Jan 7, 2025 - 12:07pm

Earthquake in Tibet kills more than 120, striking near holy Buddhist city
Steely_D

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Location: The foot of Mount Belzoni
Gender: Male


Posted: Nov 3, 2024 - 2:31pm

Who in this house know about the quake?
at the peak of his power and creativity
thisbody

thisbody Avatar

Location: out of space
Gender: Male


Posted: Nov 3, 2024 - 1:17pm

EARFQUAKE

ScottFromWyoming

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Location: Powell
Gender: Male


Posted: Oct 15, 2024 - 8:26am

 NoEnzLefttoSplit wrote:


would be kind of nice if they began at the start and worked forwards.. 


Yes. I was waiting for it to congeal into continents but it never made sense.
NoEnzLefttoSplit

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Gender: Male


Posted: Oct 15, 2024 - 8:09am

 miamizsun wrote:


Witness 1.8 Billion Years of Earth’s Tectonic Dance in a New Animation

ByAlan CollinsOctober 8, 2024
Scientists have created an animation of Earth's tectonic plates stretching back 1.8 billion years

Using information from inside the rocks on Earth’s surface, my colleagues and I have reconstructed the plate tectonics of the planet over the last 1.8 billion years.

It is the first time Earth’s geological record has been used like this, looking so far back in time. This has enabled us to make an attempt at mapping the planet over the last 40 percent of its history, which you can see in the animation below.

The work, led by Xianzhi Cao from the Ocean University in China, was recently published in the open-access journal Geoscience Frontiers.








would be kind of nice if they began at the start and worked forwards.. 
miamizsun

miamizsun Avatar

Location: (3283.1 Miles SE of RP)
Gender: Male


Posted: Oct 14, 2024 - 4:39am



Witness 1.8 Billion Years of Earth’s Tectonic Dance in a New Animation

ByAlan CollinsOctober 8, 2024
Scientists have created an animation of Earth's tectonic plates stretching back 1.8 billion years

Using information from inside the rocks on Earth’s surface, my colleagues and I have reconstructed the plate tectonics of the planet over the last 1.8 billion years.

It is the first time Earth’s geological record has been used like this, looking so far back in time. This has enabled us to make an attempt at mapping the planet over the last 40 percent of its history, which you can see in the animation below.

The work, led by Xianzhi Cao from the Ocean University in China, was recently published in the open-access journal Geoscience Frontiers.






miamizsun

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Location: (3283.1 Miles SE of RP)
Gender: Male


Posted: Apr 16, 2024 - 4:46am

 Red_Dragon wrote:








KurtfromLaQuinta

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Location: Really deep in the heart of South California
Gender: Male


Posted: Apr 14, 2024 - 4:16pm

 geoff_morphini wrote:

Admit it Kurt, you’re just not sensitive


Yes.
I need to go to a sensitivity training program to be more compassionate. 



islander

islander Avatar

Location: West coast somewhere
Gender: Male


Posted: Apr 14, 2024 - 11:01am

 geoff_morphini wrote:

Admit it Kurt, you’re just not sensitive




A wise man once wrote:

Anything under a 5.8 is a snoozer.





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