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M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

earthquake.usgs.gov

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Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#191

Post by bobthepanda »

cossatot wrote: post #185
spopejoy wrote: post #53

I'm in Brooklyn and felt it while on a call with an NJ resident who was the first to say "are we having an earthquake??" Do earthquakes have a propagation speed? Might she have felt it before me?

Earthquake waves have several propagation speeds, because there are different types of waves. The fastest is called the P-wave, which is a compressional (longitudinal) wave, similar to a sound wave, with a velocity of ~5-8 km/s for typical continental bedrock. The second fastest is the S-wave, or shear wave, which is about 65% of the P-wave speed. These waves produce relatively little displacement at the surface (exc…

Early warning systems also work by detecting P and S waves as close to the epicenter as possible.

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#193

Post by flakes »

Both me and my girlfriend were working from home today. Randomly our dog started crying and a few seconds later we felt the quake. Was pretty wild. Lots of rattling of furniture and plates in the cabinets. I guess my dog must have noticed the more subtle rumbles beforehand.

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#194

Post by cj »

gcr wrote: post #121
pxx wrote: post #58

Earlier quoted context omitted.

Yes, the speed of sound (through the earth, so faster than the speed of sound in air); yes. In California, typically usgs has earthquakes posted before I can feel them. They didn't have this one a few minutes after I felt it, so I feel like automatic earthquake detection is off in this area of the US.

I received the earthquake alert about 45 minutes after it occurred.

The Apple alert came in at 12:05pm warning of aftershocks but not the primary event.

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#195

Post by neurostimulant »

cossatot wrote: post #185
spopejoy wrote: post #53

I'm in Brooklyn and felt it while on a call with an NJ resident who was the first to say "are we having an earthquake??" Do earthquakes have a propagation speed? Might she have felt it before me?

Earthquake waves have several propagation speeds, because there are different types of waves. The fastest is called the P-wave, which is a compressional (longitudinal) wave, similar to a sound wave, with a velocity of ~5-8 km/s for typical continental bedrock. The second fastest is the S-wave, or shear wave, which is about 65% of the P-wave speed. These waves produce relatively little displacement at the surface (exc…

Ground liquefaction is scary. Happened in Palu, Sulawesi a while ago. You can see houses moving as if they're on wheels: https://www.youtube.com/watch?v=J_egBKj1W08

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#196

Post by cozzyd »

tomschlick wrote: post #110
sunshine_reggae wrote: post #79

The marketing team at Rumble.com is really innovating these days, getting people to switch over from Youtube.

Everyone should be able to appreciate a dad joke like this... even if it was a bit shaky.

It's hard to fault someone for slipping loose everyone once in a while

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#197

Post by neogodless »

chrinic74929 wrote: post #65
seydor wrote: post #55

Earlier quoted context omitted.

4.7 is not really a strong earthquake, it s routine in earthquake-prone zones

> 4.7 is not really a strong earthquake, it s routine in earthquake-prone zones NYC quake was at shallow depth. 4.7 quake at 1 km depth will shake more at the surface than a 6.0 at 30 km depth

In this case, it's a 4.8 mwr at 4.7 km depth.

Re: M 4.8 – 2024 Whitehouse Station, New Jersey Earthquake

#200

Post by nicwolff »

pjsg wrote: post #7

I felt it in Mass -- I was working on the second floor. My wife was on the ground floor and didn't feel it. From our internal slack channel, this seems fairly common -- people on the ground floor don't feel it here in MA, but higher floors, they do feel it.

I'm in a house up in Chelmsford, north of Boston – one person on the second floor felt it.
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