What is an â€˜Earthquake Boomâ€™?
Earthquake Boom is a very loud, deep sounding explosion, which emanates from the earth. If directly above emanation, directional determination may be difficult as sound is not from a distinct direction as it is from a wide area of earthâ€™s surface. It is a higher frequency audio form of the traditional shaking earthquake even though current seismographs cannot â€˜seeâ€™ or â€˜recordâ€™ them. Scalar devices are able to clearly â€˜seeâ€™ these events along with the rest of the earthquake â€˜familyâ€™ of earth-generated events such as the â€˜silentâ€™ or â€˜slowâ€™ earthquake. Another relative to the â€˜familyâ€™ is the earth â€˜lurchâ€™ and a â€˜fast version of slowâ€™ earthquake â€“ these yet to be discovered by mainstream science.
These loud explosions have been witnessed by many over the years. They also accompany traditional earthquakes as these are part of the mix of seismic activity (earthquake & earthquake boom).City residents of Spokane Washington in the summer of 2001 experienced a classic series of explosions (earthquake booms) and earthquakes in a flurry of shallow earthquake swarms. Seismologists were unable to record these booming events on seismographs.
A mysterious swarm of earthquakes unnerves Spokane
“Long after the last Fourth of July firecracker burst in Spokane, nerve-rattling explosions still shake the city. There has been a swarm of earthquakes that boom like dynamite, surprising residents and seismologists alike.â€
Recently, a loud explosion in South Carolina again follows the classic signature of the rare type of event â€“ no seismograph recordings, no supersonic aircraft around to create sonic boom, and very loud (other proposed theories include suggested sea floor gas release or other phenomena related to historical â€˜Seneca Gunsâ€™). However, earthquake booms are real events and occur from within the crust. These events also may occur in regions without a fault or without a seismically active region.
Charleston Post and Courier
Sonic boom? Earthquake? Big bang theories abound
â€œThe earthquake experts say it wasn’t a shaker, and military authorities say they didn’t have the kind of planes in the air that can make a sonic boom.â€
â€œBut whatever it was, the noise that rattled Lowcountry communities about 1:30 p.m. Friday commanded a lot of attention.â€
â€œThere was this extremely loud, percussive noise,” said Reynolds Pommering of Mount Pleasant. “My sister (on James Island) said she heard it, too, and that’s eight miles across as the crow flies. I first thought somebody had run into the building.”â€
Will these explosions mean an eruption is imminent?
If near volcanoes or volcanic region, the â€˜earthquake boomâ€™ is just another form of an earthquake with the energy of a small size quake. Yes, the explosion sound is very impressive and can lead to concern. Yet only larger earthquakes would be reason for scrutiny of developing conditions (USGS volcanic observatories have a wealth of instrumentation available for analysis of any developing activity related to U.S. volcanoes. Refer to excellent reference & up to date status at: