It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
A loud boom shook the coastal Lowcountry Wednesday morning, felt from Mount Pleasant to West Ashley. And once again, no one could say what it caused it.
Seismographs at the College of Charleston didn't pick up any earthquake activity. The Charleston Air Force Base didn't report any military aircraft creating sonic booms.
No commercial vessels responded to a U.S. Coast Guard message asking for reports if it had been felt offshore.
The reverberation most likely came from the "Seneca Guns," a so-far-unexplained phenomenon felt along coasts around the world.
Some experts speculate that the booms are caused by gases released from the sea floor, or undersea landslides along the Continental Shelf, or the echoed sound of distant thunder, or lightning-like electrical discharges, or even meteors crashing into the atmosphere at angles.
The latest blast hit just before 10 a.m.
"It was a pretty good shake, a pretty loud boom," said Mark Reamer, who felt it in the Financial Management
As with most historical earthquakes, details about sounds and the actual level of ground motion related to the Charleston, SC Earthquake (1886) are somewhat sketchy and hard to authenticate. "Dutton, Clarence E., 1889: "The Charleston Earthquake of August 31, 1886," Ninth Annual Report, 1887-88, U.S. Geological Survey, Washington D.C., p. 203-528" is perhaps the most comprehensive scientific document that compiles seemingly credible accounts from numerous sources. Dutton objectively sums these interviews/observations with the following: "According to the testimony of some, the first intimation of the disturbance was a strange sound or murmur. Others say that with the sound they felt the trembling, and that both increased, at first steadily, but by perceptible stages, and then suddenly or by swift degrees, to the full roar and energy of the climax. Dr. Manigault resides in a very quiet street near the Battery, and but a few hundred yards from the estuary of the Ashley River. He was engaged in a game of chess, and a member of his family was sitting by an open window. The latter, surprised or perhaps alarmed by the prolonged sound, arose, crossed the room, entered the hall, and passed out into the open air before the doctor became aware of anything unusual. The sound appeared to come across the water of Ashley River from the west-southwest. Another observer of intelligence was seated in the park at the Battery, near the statue of Jasper. He suddenly became conscious of a deep murmur, which swelled in volume, and which appeared to come from the open bay, lying southeastward. Very soon there was a sound of agitation in the leaves of the trees overhead, and at the same instant, he thinks, he became aware of a tremor in the ground. Springing to his fee, there suddenly broke upon his ear a rapid swell in the sound, which became a mighty roar, and with the roar came a shock." It is apparent from these observations that, at least for the main shock, people heard the actual low frequency motions of the damaging earthquake waves as they rolled across the region and right down their street.....the "roar' came with the "shock".
Originally posted by alfa1
Like I said in the thread a few days ago, people who live there should setup some kind of recording devices to enable triangulation. I'm surprised nobody has bothered yet.
Towering over 65 feet high, the Angel Oak has shaded John's Island, South Carolina, for over 1400 years, and would have sprouted 1000 years before Columbus' arrival in the New World. Recorded history traces the ownership of the live oak and surrounding land, back to the year 1717 when Abraham Waight received it as part of a small land grant. The tree stayed in the Waight family for four generations, and was part of a Marriage Settlement to Justus Angel and Martha Waight Tucker Angel. In modern times, the Angel Oak has become the focal point of a public park. Today the live oak has a diameter of spread reaching 160 feet, a circumference of nearly 25 feet, and covers 17,100 square feet of ground. www.historictrees.org