Earthquakes By Noor and Aranka Characteristics An earthquake is a trembling if the ground that result from the sudden shifting of rock beneath the earth’s crust. Spatial distribution Earthquakes happen at the edges of tectonic plates as they are the effects if the plates moving against or past each other. Spatial extent The spatial extent of an earthquake depends on the magnitude. When the ground shaking affects areas 100 km or more from the epicentre, it is considered a hazard. Predictability It is very difficult to predict when an earthquake will happen. Areas that have experienced earthquakes before are more likely to experience another as this indicates active faults Frequency & magnitude Magnitude 8 and higher 7 - 7.9 6 - 6.9 5 - 5.9 4 - 4.9 3 - 3.9 2 - 2.9 Average Annually 1¹ 15 ¹ 134 ² 1319 ² 13,000 (estimated) 130,000 (estimated) 1,300,000 (estimated) Duration The duration of an earthquake is usually about a few minutes. The duration of the effect can last much longer though, varying on the magnitude and destructing caused by the earthquake. Thank you for watching!