Alexander Besant of the Global Post explains that the 2012 Sumatra earthquake resulted from up to five faults in the tectonic plates under the ocean floor. Besant makes reference to a study explaining that the faults acted in concert and slid sideways to create a series of massive ruptures, resulting in the 8.6 magnitude earthquake. He also notes that researchers believe this may signal the splitting of the Indo-Australian plate.
Helen Shen of the international science journal Nature notes that a 2004 quake along with a 2005 quake in the same area may have also acted as a trigger to the 2012 large-scale event by adding to pent-up stresses in the plate’s middle region. The California Institute of Technology gives further insight to the 2004 quake by stating that the earthquake ruptured the greatest fault length of any recorded earthquake, a distance of more than 900 miles, which measures longer than the state of California. The institute also explains that the rupture did not tear apart the land all at once but rather progressed northward from the epicenter along the fault for about 10 minutes. Furthermore, the two tectonic plates that lie at the rupture suddenly broke free, causing the upper plate to slide back upward and to the west along the plate boundary.Learn More
An adequate earthquake survival kit includes a first aid kit, a home survival kit, a car survival kit and a work survival kit. The first aid kit and home survival kit should have enough supplies to last for three days.Full Answer >
California has a relatively high number of earthquakes due to its position on both the Pacific and North American Plates. These plates are in constant motion, and earthquakes occur when their sides slip against one another suddenly.Full Answer >
A diagram that uses the Richter scale is used to measure the magnitude of an earthquake. When an earthquake takes place, a device called a seismograph records the earthquake's vibration, and multiple seismographs can form a coherent picture. From the resulting diagram, the earthquake's force can be determined.Full Answer >
Earthquakes are caused by sudden movement in opposing tectonic plates in the earth. As plates move against each other, sometimes the rocky edges catch against one another. The rest of the plate remains in motion, putting stress on the sticking point, and when it gives way, an earthquake occurs.Full Answer >