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lakersken80
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 Posted: Tue Sep 19, 2017 1:03 pm Post subject: 7.1 earthquake in Central Mexico |
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adkindo
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| Posted: Tue Sep 19, 2017 1:20 pm Post subject: |
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| going to be a high number of casualties...many images of large buildings that just crumbled. |
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22
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| Posted: Tue Sep 19, 2017 1:31 pm Post subject: |
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when I saw the thread title, I thought this was the same earthquake from a few weeks ago!  |
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Lucky_Shot
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marga86
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| Posted: Tue Sep 19, 2017 1:52 pm Post subject: |
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| breaks my heart seeing the homeland hit like this. Hoping for the best for everyone.. unreal, my parents left mexico this morning to come to LA.. Barely missed the earthquake. |
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adkindo
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| Posted: Tue Sep 19, 2017 1:58 pm Post subject: |
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| marga86 wrote: | | breaks my heart seeing the homeland hit like this. Hoping for the best for everyone.. unreal, my parents left mexico this morning to come to LA.. Barely missed the earthquake. |
wow, were they close to Mexico City? |
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Hammett
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| Posted: Tue Sep 19, 2017 3:20 pm Post subject: |
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| 22 wrote: | | when I saw the thread title, I thought this was the same earthquake from a few weeks ago! |
Yeah, I was like why isn't my phone refreshing, is my signal weak here?
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lakersken80
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| Posted: Tue Sep 19, 2017 4:28 pm Post subject: |
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| Sadly, it takes a big earthquake to realize what deathtraps a lot of these old buildings are. |
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leor_77
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| Posted: Tue Sep 19, 2017 5:45 pm Post subject: |
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| Interesting - there was a 3.6 magnitude earthquake last night (11 PM) in Los Angeles - I definitely felt it. I'm wondering if it could be related to the larger one in Mexico. Could a smaller one like that foreshadow a larger one not that far away? |
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22
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| Posted: Tue Sep 19, 2017 6:18 pm Post subject: |
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| Hammett wrote: | | 22 wrote: | | when I saw the thread title, I thought this was the same earthquake from a few weeks ago! |
Yeah, I was like why isn't my phone refreshing, is my signal weak here? |
Right?! Sucks man.
Praying for them |
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Goldenwest
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| Posted: Tue Sep 19, 2017 11:08 pm Post subject: |
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| leor_77 wrote: | | Interesting - there was a 3.6 magnitude earthquake last night (11 PM) in Los Angeles - I definitely felt it. I'm wondering if it could be related to the larger one in Mexico. Could a smaller one like that foreshadow a larger one not that far away? |
I felt that 3.6 also. And to answer your question, no they're not related. Two completely different fault systems - too far apart.
Lack of proper shear reinforcement in these multistory buildings is a killer. I look around downtown LA and some of our older building certainly don't look like they can withstand a good quake. The new ones, while they will certainly take damage are designed not to collapse. That's the theory anyway. |
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venturalakersfan
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| Posted: Wed Sep 20, 2017 9:17 am Post subject: |
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Successful building materials depend on the earthquake. Earthquakes have a frequency and materials with a similar frequency survive, while those vastly different typically collapse. Soil makes a big difference, earthquake waves move quickly through tight and solid soils while loose sedimentary soils allow the waves to expand. That is what we have in Southern California and also the previous Mexico City quake (former lake bed). Consider the last major earthquake in Southern California, at Fort Tejon. There was surface rupture at the epicenter but in the sandstone mountains there was little damage as the waves quickly spread from the area. The real damage was in the coastal areas of LA and San Diego. The current Uniform Building Code does a good job of addressing these issues.
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venturalakersfan
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| Posted: Wed Sep 20, 2017 10:21 am Post subject: |
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6+ in Tokyo, the rim of fire is active
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Goldenwest
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| Posted: Wed Sep 20, 2017 10:45 pm Post subject: |
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| venturalakersfan wrote: | | Successful building materials depend on the earthquake. Earthquakes have a frequency and materials with a similar frequency survive, while those vastly different typically collapse. Soil makes a big difference, earthquake waves move quickly through tight and solid soils while loose sedimentary soils allow the waves to expand. That is what we have in Southern California and also the previous Mexico City quake (former lake bed). Consider the last major earthquake in Southern California, at Fort Tejon. There was surface rupture at the epicenter but in the sandstone mountains there was little damage as the waves quickly spread from the area. The real damage was in the coastal areas of LA and San Diego. The current Uniform Building Code does a good job of addressing these issues. |
they also need to be designed for a certain (probabilistic) magnitude and PGA. I'll bet the buildings that fell in Mexico weren't even seismically designed. Btw, Sounds like you know your stuff VLF. |
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