This trembling feeling is not your imagination

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For most Jacksonville residents, the gentle rocking at 2:18 p.m. Thursday came and went. Those who noticed it could have mistaken it for a large truck passing by.

The US Geological Survey confirms that a magnitude 3.8 earthquake occurred about 5 miles below the surface near Rockville, Indiana. Although considered minor – 3.0 is the lowest magnitude on record – it was strong enough to be felt. It is usually at a magnitude of 4.0 that the shaking becomes noticeable inside and things start to shake.

But the US Geological Survey says it has received reports from as far away as Chicago and the St. Louis area.

In Jacksonville, 254 kilometers from the epicenter, two people reported the event to the federal agency. It was rated III on the Modified Mercalli Intensity Scale, meaning it could be “felt quite noticeably by people indoors, especially on upper floors of buildings.” Many do not recognize it as an earthquake. Standing vehicles may tip over slightly.

One person reported it to Frederick in Schuyler County – 264 kilometers from the epicenter – but it was rated II on the intensity scale, which means few people likely felt it.

At Raymond, it was a little more intense. The town of Montgomery County, located 207 kilometers from Rockville, Indiana, has been ranked IV on the Mercalli Modified Intensity Scale, which is intense enough to wake people up and cause crackling in walls with a “feeling like a heavy truck hitting a building”.

It is rare for an earthquake to occur in Illinois. US Geological Survey officials say the state averages one per year, but it’s only about once every 20 years that there’s one strong enough to cause minor damage. A magnitude 3.8 quake was reported in southeastern Illinois in September 2017.

Illinois sits along two fault lines – the New Madrid Seismic Zone and the Wabash Valley Seismic Zone – so the risk is there.

“While some hazards such as storms, tornadoes and floods can be expected to warn residents of a hazardous area in advance, other hazards such as earthquakes cannot be predicted,” said Alicia Tate-Nadeau, director of the Illinois Emergency Management Agency. “Earthquakes can happen anywhere and anytime, including while you are at work, at home or on vacation. Creating an environment of education, awareness and preparedness can save lives.

The largest earthquake centered in Illinois struck at 11:02 a.m. on November 9, 1968 and measured 5.4 on the Richter scale. Its epicenter was in Hamilton County, about 190 kilometers east of St. Louis, and it was felt in parts of 23 states, according to historical documents. There was extensive damage as far north as Chicago.

The Illinois Emergency Management Agency says most earthquake injuries and deaths occur from debris and objects falling on people. He participates in International ShakeOut Day each fall on the third Thursday in October so that people can practice learning to “Drop, Cover and Hold” in an earthquake – drop to the ground, drop to the ground, hang over and hold on. put away under solid furniture and keep lit until the agitation is finished.


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