There are generally two types of hay bales. With quite different weights. The most common ones that people buy at feed stores or the farmer, and can be moved by one person, are the type you may have bucked into the barn for your uncle who had a farm when you were a teenager. They are around 3-4 feet long by 24x18 inches square.
How Earthquakes Happen. An aerial view of the San Andreas fault in the Carrizo Plain, Central California. An earthquake is the vibration, sometimes violent, of the Earth's surface that follows a release of energy in the Earth's crust. This energy can be generated by a sudden dislocation of segments of the crust, by a volcanic eruption, or event by manmade explosions.
Two active Southern California faults may cause a Big One by rupturing together. Two of Southern California's most active faults could rupture together in a magnitude-7.5 earthquake, according to a new study, raising a grim seismic scenario for communities east of Los Angeles. The study established how a major earthquake could begin on the San Jacinto fault and continue on the San Andreas, which is California's longest and one of its most dangerous faults. The San Andreas historically has produced stronger earthquakes than the San Jacinto.