An earthquake occurs when the movement and breaking of rock masses happen on pre-existing faults. Once an earthquake hits, energy is created through seismic waves that travel through the Earth's crust.Continue Reading
Seismic waves transport energy though different areas. Seismic waves are physical waves that have many different parts. The crest is the high point of the wave, while the trough is the low point. The distance that is between the crests or troughs is the wavelength. The wave height represents the vertical distance that is from the undisturbed surface to the wave crest. Typically, the bigger the waves are, the more energy they provide. The large waves are steep and have a unique shape.
The ground shakes during an earthquake due to the energy from the waves. The closer it gets to the epicenter, the more the ground shakes. Once the seismic energy makes its way through the rocks, the energy will then dissipate. The waves move at various speeds depending on the size of the waves. At the epicenter, all the waves are created there at roughly the same time, which makes the ground shake very abruptly for a small amount of time. The waves that are created by the earthquake are measured and recorded by a seismograph.Learn more about Earthquakes
The United States Geological Survey Earthquake Hazard Program provides a live earthquake monitoring system that monitors time, location, depth, and other valuable information on earthquakes worldwide. The website also offers several learning resources, live global maps and seismic activity archives.Full Answer >
Some of the largest earthquakes in the history of the United States include the 1964 Great Alaska earthquake and the earthquake that hit the Cascadia subduction zone in 1700. The 1964 earthquake was 9.2 magnitude, and the 1700 earthquake was 9 magnitude. These are the only earthquakes in the United States to register over 9 magnitude.Full Answer >
The major dangers of earthquakes include other hazardous effects that could occur after an earthquake subsides, such as liquefaction, tsunamis, further ground tremors and landslides. By being aware of these dangers, in the event that they occur, it is possible to get to safety faster.Full Answer >
Like most earthquakes, the 1556 Shaanxi earthquake occurred due to the sudden shifting of tectonic plates against each other. Tectonic plates are large chunks of the earth’s crust, and the cracks between these chunks are known as faults. East Qinling’s northern Piedmont fault is the likely origin of the Shaanxi disaster.Full Answer >