(Since 1990, that area has experienced twelve quakes with magnitudes of five or greater).
The swarm in central Arkansas has brought dozens of rumblings each week, many of them with magnitudes beyond 2.0.
Sensitive seismographs can record earthquakes with magnitudes of negative value and have recorded magnitudes up to about 9.0.
Fan Xiao, a chief engineer with the Sichuan Geology and Mineral Bureau, said that from late 2004 to late 2005, the data showed 730 minor earthquakes, with magnitudes of 3 or less.
They combined quakes into "bins" of half a magnitude on the scale, so all the earthquakes between five and 5.5 went in to one bin, all those with magnitudes between 5.5 and six into the next bin, and so on.
The collapse of the World Trade Center towers, nearly ten years ago, registered as minor earthquakes (with magnitudes of 2.2 and 2.4) on a seismometer….
The United States Geological Survey recorded 90 quakes off the eastern coast on Saturday alone, five of them with magnitudes larger than 6.0.
Two of Crux's stars, Alpha Crucis and Beta Crucis, are the 13th and 20th brightest stars in the sky, respectively, with magnitudes of 0.8 and 1.3.
While all 67 quakes were relatively minor, with magnitudes of 3.0 or less, the research provided a fuller picture of seismic activity in the Barnett Shale area.
The United States Geological Survey listed three fairly strong earthquakes in Gansu Province on Monday morning, with magnitudes of 5.9, 5.6 and 4.7.
Surface changes with magnitudes larger 1.5 cm are reliably measured.
