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

rgio Avatar

Location: West Jersey
Gender: Male


Posted: Apr 5, 2024 - 3:42pm

 Bill_J wrote:

Just had an after shock


yup...right at 6pm

Bill_J

Bill_J Avatar



Posted: Apr 5, 2024 - 3:00pm

Just had an after shock
Antigone

Antigone Avatar

Location: A house, in a Virginian Valley
Gender: Female


Posted: Apr 5, 2024 - 2:23pm

 JrzyTmata wrote:

no alerts. just the low rumbles like a big truck was going by.
they're reporting this the biggest quake on record in Philly area. although the one in 2011 (centered in Virginia) shook us a lot more. I saw the frickin' wall  and floor waving. 


I was at work when that one hit. In a mobile trailer type thingy, and was standing in the hall outside my office talking to a co-worker when I notice my snake plant swaying. I said: "I think that was an earthquake." He hadn't even noticed. When I got home (closer to the epicenter than work), Middy (remember Middy?) was beside herself. As if to say: "I didn't do it, Mom!" Nothing off the walls, but all the pictures were askew and some things were knocked over.

JrzyTmata

JrzyTmata Avatar



Posted: Apr 5, 2024 - 2:11pm

 geoff_morphini wrote:

I’m always a little leery that someone’s posting a video from another earthquake but the accents give me confidence this is NJ. Note the little dog reacts to the bang and jolt. That’s the p-wave. Then the big shaking comes in, that’s the shear wave (s-wave). There are other waves that follow. The second part of the video, shot down the hall is great as well, can really see the pop of the p-wave. Also, the duration of the earthquake, I count about 5-6 seconds is what we expect from that size event. 
https://x.com/rawsalerts/statu...


lol they just showed that video on the news.
we're about 60 miles from the center. wasn't that shook. felt more like the floor vibrating.
there was a 2.2 in the same area last week. pre-shock they are saying

geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Apr 5, 2024 - 12:32pm

 JrzyTmata wrote:

no alerts. just the low rumbles like a big truck was going by.
they're reporting this the biggest quake on record in Philly area. although the one in 2011 (centered in Virginia) shook us a lot more. I saw the frickin' wall  and floor waving. 


I’m always a little leery that someone’s posting a video from another earthquake but the accents give me confidence this is NJ. Note the little dog reacts to the bang and jolt. That’s the p-wave. Then the big shaking comes in, that’s the shear wave (s-wave). There are other waves that follow. The second part of the video, shot down the hall is great as well, can really see the pop of the p-wave. Also, the duration of the earthquake, I count about 5-6 seconds is what we expect from that size event. 
https://x.com/rawsalerts/statu...

geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Apr 5, 2024 - 12:22pm

How similar sized earthquakes are felt differently on E and W coasts, it’s the rocks

https://x.com/seismosue/status...
JrzyTmata

JrzyTmata Avatar



Posted: Apr 5, 2024 - 10:54am

 geoff_morphini wrote:

 If you weren’t already aware, there is an event page the USGS develops (usually within 5 min of the earthquake). It is here https://earthquake.usgs.gov/ea...

A couple of notable things 1) within that event page is a “Did you feel it?” Inquiry https://earthquake.usgs.gov/ea.... This provides incredible intensity information to develop site attenuation models and such - please consider putting your info in it. 2) there have been over 109, 000 responses thus far! That amazing for a M4.8 event however, 3 things factor in a) lots of people available to experience event, b) shallow (less than 4 km deep (most western eq’s are 10 -15 km or greater and c) your rocks are old, strong and unbroken (like a good bell. The responses are more than 100 miles from the epicenter, I’ll bet people will report it over 200 miles away. That doesn’t happen in the west, our bell is not as strong. 3) Most New England earthquakes are caused by glacial rebound (not tectonics). You had km’s of ice sitting on the crust about 20 - 12 thousand years ago. That’s lots of weight. It depressed the crust. The ice suddenly melted (over a few thousand years) and the crust is still “bouncing back.” If you put a significant weight on rocks for a long period of time they will flex (elastically), if you remove that weight quickly they may respond in a brittle way (hence earthquake). 4) one other thing to note - the USGS provides a forecast of potential aftershocks over the next week - in your case you have a 16% chance of having a M4+ and a 46% chance of an M3+ It is very unlikely, but not impossible, that you will feel another the same size or greater.https://earthquake.usgs.gov/ea...

There will be a lot of info to come. 

I was at USGA site before they even posted. LOL
I'll post my info there when I get home.

JrzyTmata

JrzyTmata Avatar



Posted: Apr 5, 2024 - 10:52am

 geoff_morphini wrote:


Jrzy, did something alert you to the beginning of the shaking, like a banging sound, a pop or a jolt? The low rumble was likely the shear wave (accompanied by swaying motion). The sudden motion would be the primary (p wave). In smaller earthquakes most people don’t realize that’s what alerted them to the beginning of the event

no alerts. just the low rumbles like a big truck was going by.
they're reporting this the biggest quake on record in Philly area. although the one in 2011 (centered in Virginia) shook us a lot more. I saw the frickin' wall  and floor waving. 

steeler

steeler Avatar

Location: Perched on the precipice of the cauldron of truth


Posted: Apr 5, 2024 - 10:19am

 geoff_morphini wrote:

 If you weren’t already aware, there is an event page the USGS develops (usually within 5 min of the earthquake). It is here https://earthquake.usgs.gov/ea...

A couple of notable things 1) within that event page is a “Did you feel it?” Inquiry https://earthquake.usgs.gov/ea.... This provides incredible intensity information to develop site attenuation models and such - please consider putting your info in it. 2) there have been over 109, 000 responses thus far! That amazing for a M4.8 event however, 3 things factor in a) lots of people available to experience event, b) shallow (less than 4 km deep (most western eq’s are 10 -15 km or greater and c) your rocks are old, strong and unbroken (like a good bell. The responses are more than 100 miles from the epicenter, I’ll bet people will report it over 200 miles away. That doesn’t happen in the west, our bell is not as strong. 3) Most New England earthquakes are caused by glacial rebound (not tectonics). You had km’s of ice sitting on the crust about 20 - 12 thousand years ago. That’s lots of weight. It depressed the crust. The ice suddenly melted (over a few thousand years) and the crust is still “bouncing back.” If you put a significant weight on rocks for a long period of time they will flex (elastically), if you remove that weight quickly they may respond in a brittle way (hence earthquake). 4) one other thing to note - the USGS provides a forecast of potential aftershocks over the next week - in your case you have a 16% chance of having a M4+ and a 46% chance of an M3+ It is very unlikely, but not impossible, that you will feel another the same size or greater.https://earthquake.usgs.gov/ea...

There will be a lot of info to come. 

Very interesting. Thanks!

rgio

rgio Avatar

Location: West Jersey
Gender: Male


Posted: Apr 5, 2024 - 9:36am

 geoff_morphini wrote:
Jrzy, did something alert you to the beginning of the shaking, like a banging sound, a pop or a jolt? The low rumble was likely the shear wave (accompanied by swaying motion). The sudden motion would be the primary (p wave). In smaller earthquakes most people don’t realize that’s what alerted them to the beginning of the event

Jrzy and I live pretty close to each other...and I heard it...a loud rumble...and then the platter of my turntable started banging into the "walls" of the deck behind me.  Given the rain, and the fact that a tree came down in the woods by my house, I was worried that one of the larger trees had fallen on my house.

geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Apr 5, 2024 - 9:08am

 islander wrote:


David Lee Roth running down the street singing "I'm your earthquake man, stop me when I'm passin' by"?


HA!
islander

islander Avatar

Location: West coast somewhere
Gender: Male


Posted: Apr 5, 2024 - 9:06am

 geoff_morphini wrote:


Jrzy, did something alert you to the beginning of the shaking, like a banging sound, a pop or a jolt? The low rumble was likely the shear wave (accompanied by swaying motion). The sudden motion would be the primary (p wave). In smaller earthquakes most people don’t realize that’s what alerted them to the beginning of the event


David Lee Roth running down the street singing "I'm your earthquake man, stop me when I'm passin' by"?
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Apr 5, 2024 - 9:00am

 JrzyTmata wrote:

we just had a 4.7 in northern New Jersey.
we felt a low rumble here in South Jersey. 



Jrzy, did something alert you to the beginning of the shaking, like a banging sound, a pop or a jolt? The low rumble was likely the shear wave (accompanied by swaying motion). The sudden motion would be the primary (p wave). In smaller earthquakes most people don’t realize that’s what alerted them to the beginning of the event
NeuroJoe

NeuroJoe Avatar

Location: Philly suburbs
Gender: Male


Posted: Apr 5, 2024 - 8:47am

 geoff_morphini wrote:

 If you weren’t already aware, there is an event page the USGS develops (usually within 5 min of the earthquake). It is here https://earthquake.usgs.gov/ea...

A couple of notable things 1) within that event page is a “Did you feel it?” Inquiry https://earthquake.usgs.gov/ea.... This provides incredible intensity information to develop site attenuation models and such - please consider putting your info in it. 2) there have been over 109, 000 responses thus far! That amazing for a M4.8 event however, 3 things factor in a) lots of people available to experience event, b) shallow (less than 4 km deep (most western eq’s are 10 -15 km or greater and c) your rocks are old, strong and unbroken (like a good bell. The responses are more than 100 miles from the epicenter, I’ll bet people will report it over 200 miles away. That doesn’t happen in the west, our bell is not as strong. 3) Most New England earthquakes are caused by glacial rebound (not tectonics). You had km’s of ice sitting on the crust about 20 - 12 thousand years ago. That’s lots of weight. It depressed the crust. The ice suddenly melted (over a few thousand years) and the crust is still “bouncing back.” If you put a significant weight on rocks for a long period of time they will flex (elastically), if you remove that weight quickly they may respond in a brittle way (hence earthquake). 4) one other thing to note - the USGS provides a forecast of potential aftershocks over the next week - in your case you have a 16% chance of having a M4+ and a 46% chance of an M3+ It is very unlikely, but not impossible, that you will feel another the same size or greater.https://earthquake.usgs.gov/ea...

There will be a lot of info to come. 


Super cool, thanks!
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Apr 5, 2024 - 8:37am

 JrzyTmata wrote:

we just had a 4.7 in northern New Jersey.
we felt a low rumble here in South Jersey. 


 If you weren’t already aware, there is an event page the USGS develops (usually within 5 min of the earthquake). It is here https://earthquake.usgs.gov/ea...

A couple of notable things 1) within that event page is a “Did you feel it?” Inquiry https://earthquake.usgs.gov/ea.... This provides incredible intensity information to develop site attenuation models and such - please consider putting your info in it. 2) there have been over 109, 000 responses thus far! That amazing for a M4.8 event however, 3 things factor in a) lots of people available to experience event, b) shallow (less than 4 km deep (most western eq’s are 10 -15 km or greater and c) your rocks are old, strong and unbroken (like a good bell. The responses are more than 100 miles from the epicenter, I’ll bet people will report it over 200 miles away. That doesn’t happen in the west, our bell is not as strong. 3) Most New England earthquakes are caused by glacial rebound (not tectonics). You had km’s of ice sitting on the crust about 20 - 12 thousand years ago. That’s lots of weight. It depressed the crust. The ice suddenly melted (over a few thousand years) and the crust is still “bouncing back.” If you put a significant weight on rocks for a long period of time they will flex (elastically), if you remove that weight quickly they may respond in a brittle way (hence earthquake). 4) one other thing to note - the USGS provides a forecast of potential aftershocks over the next week - in your case you have a 16% chance of having a M4+ and a 46% chance of an M3+ It is very unlikely, but not impossible, that you will feel another the same size or greater.https://earthquake.usgs.gov/ea...

There will be a lot of info to come. 
Bill_J

Bill_J Avatar



Posted: Apr 5, 2024 - 7:44am

 JrzyTmata wrote:

we just had a 4.7 in northern New Jersey.
we felt a low rumble here in South Jersey. 


Our house was shaking here just north of your border.
JrzyTmata

JrzyTmata Avatar



Posted: Apr 5, 2024 - 7:41am

we just had a 4.7 in northern New Jersey.
we felt a low rumble here in South Jersey. 
NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: Mar 23, 2023 - 1:13pm

 geoff_morphini wrote:


Sort of my feeling about Bard's response. Could have asked the same for the US west coast. 

Ignimbrite flare-up - I'd like to see that paper. The IFU the western US experienced (ca. 20-30 Ma) was due to the Farallon slab collapsing into the mantle and really hot asthenospheric material contacting continental crust...boom!  

As to the question about future prospects of the diminishing Alpine fault, I don't know. I'll have to look for another example of opposed polarity subduction zones mating

It is definitely geology on steroids in Aotearoa

I guess that is a band name  

I'll try and find that paper for you. I think it was from this year.
geoff_morphini

geoff_morphini Avatar

Gender: Male


Posted: Mar 23, 2023 - 1:08pm

 NoEnzLefttoSplit wrote:


ha, interesting what that punches out.  Basically very bland.   
The most recent paper I read is that NZ is currently in the middle or even beginnings of an ignimbrite flare-up so I wouldn't go with relative stability, unless you take some ridiculously short time-frame for geological processes. The rest is pretty mundane stuff that could apply just about anywhere on the Pacific rim.
The actually reality is that NZ geology is scary as all hell but equally fascinating.



Sort of my feeling about Bard's response. Could have asked the same for the US west coast. 

Ignimbrite flare-up - I'd like to see that paper. The IFU the western US experienced (ca. 20-30 Ma) was due to the Farallon slab collapsing into the mantle and really hot asthenospheric material contacting continental crust...boom!  

As to the question about future prospects of the diminishing Alpine fault, I don't know. I'll have to look for another example of opposed polarity subduction zones mating. 

It is definitely geology on steroids in Aotearoa
NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: Mar 23, 2023 - 12:18pm

 miamizsun wrote:

thank you bard!

New Zealand is located in the Pacific Ring of Fire, a region of intense volcanic and seismic activity. The country is currently experiencing a period of relative stability, but this is expected to change in the future.

Over the next million years, New Zealand is expected to experience a number of tectonic events, including:

  • Earthquakes: New Zealand is currently experiencing a number of earthquakes each year, and this number is expected to increase in the future. The largest earthquakes in New Zealand are capable of causing significant damage and loss of life.
  • Volcanic eruptions: New Zealand is also home to a number of volcanoes, and these volcanoes are expected to erupt in the future. Volcanic eruptions can cause significant damage and loss of life, as well as release harmful gases into the atmosphere.
  • Tsunamis: New Zealand is also located in an area that is prone to tsunamis. Tsunami waves can cause significant damage and loss of life, as well as inundate coastal areas.

These tectonic events are a natural part of the Earth's evolution, but they can also pose a significant threat to the people and infrastructure of New Zealand. It is important to be aware of the risks associated with these events and to take steps to mitigate them.

There are a number of things that can be done to mitigate the risks associated with tectonic events in New Zealand. These include:

  • Building codes: Building codes in New Zealand are designed to withstand earthquakes and other tectonic events. These codes can help to reduce the damage caused by these events.
  • Emergency plans: New Zealand has a number of emergency plans in place to deal with the aftermath of tectonic events. These plans can help to reduce the loss of life and property.
  • Education: It is important to educate the people of New Zealand about the risks associated with tectonic events and how to stay safe. This education can help to reduce the impact of these events.






ha, interesting what that punches out.  Basically very bland.   
The most recent paper I read is that NZ is currently in the middle or even beginnings of an ignimbrite flare-up so I wouldn't go with relative stability, unless you take some ridiculously short time-frame for geological processes. The rest is pretty mundane stuff that could apply just about anywhere on the Pacific rim.
The actually reality is that NZ geology is scary as all hell but equally fascinating.

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