Nothing hysterical in my posts. Been simply providing data on the quake and history of quakes. An off-the-cuff comment on what I might have thought for an instant is irrelevant - look at the thread - people initially thought it was all kinds of things, including weather, airplanes, boilers exploding, whatever. Looking at the data, a 4.8 earthquake (2nd biggest in NJ history) is not trivial and everyone who felt the significant shaking was at least a little bit worried for a bit, especially since this was a very shallow quake which is felt more than deeper quakes, which are more common on the west coast, as per below. As the Princeton seismologist, below, said,
“This shaking was violent, strong and long.”
https://www.nbcnews.com/news/us-new...attles-buildings-nerves-east-coast-rcna146578
This morning's earthquake occurred on a shallow fault system in New Jersey and shook for about 35 seconds, a Princeton seismologist said.
“The shallower or the closer it is, the more we feel it as humans,” said Frederik J. Simons, a professor of geosciences at Princeton University.
The quake originated at a depth of less than 3 miles, according to USGS.
Earthquakes on the East Coast can be felt at a great distance and can cause more pronounced shaking in comparison to those on the West Coast because rocks in the region are often older, harder and more dense.
“These are competent rocks that transmit energy well,” Simons said.
The earthquake ruptured on the Ramapo fault system, he said. The system is relatively old and considered mostly tectonically inactive. It's at a boundary where the continental and oceanic tectonic plates meet and are stuck together. The plates grind against one another slowly and accumulate stress until something slips.
“There are cracks in it and now and then a little motion accumulates, the stress keeps growing, at very slow rates,” Simons said. “It’s like an old house creaking and groaning.”
He said this was one of the largest earthquakes in New Jersey in recent history. The last notable one was a magnitude-3.1 temblor in Freehold Township in September 2020.
“I’m on campus at Princeton University for the biggest one I’ve felt in a lifetime,” he said. “This shaking was violent, strong and long.”