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# earthquake impact

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1. whats the difference between shallow-focus earthquakes and deep-focus earthquakes? thank uu
2. (Original post by kjlancaster)
whats the difference between shallow-focus earthquakes and deep-focus earthquakes? thank uu

Shallow earthquakes are between 0 and 70 km deep; intermediate earthquakes, 70 - 300 km deep; and deep earthquakes, 300 - 700 km deep. In general, the term "deep-focus earthquakes" is applied to earthquakes deeper than 70 km.7 Apr 2016Determining the Depth of an Earthquakeearthquake.usgs.gov/learn/topics/seismology/determining_depth.php
3. (Original post by CorpusLuteum)

Shallow earthquakes are between 0 and 70 km deep; intermediate earthquakes, 70 - 300 km deep; and deep earthquakes, 300 - 700 km deep. In general, the term "deep-focus earthquakes" is applied to earthquakes deeper than 70 km.7 Apr 2016Determining the Depth of an Earthquakeearthquake.usgs.gov/learn/topics/seismology/determining_depth.php
ooo thank you, do you know what the difference is in impact between to two? like do deep earthquakes have less of an impact than shallow earthquakes?
4. (Original post by kjlancaster)
ooo thank you, do you know what the difference is in impact between to two? like do deep earthquakes have less of an impact than shallow earthquakes?
It depends if the buildings are stable or earthquake proof in either case.

SHALLOW FOCUS earthquakes are commonly occurring “crustal” earthquakes, caused by faults and movements of the continental plates. These are earthquakes with their focus nearer the surface of the earth. Shallow focus earthquakes are usually of large spread, causing greater damage at the surface or the earth’s crust. These occur quite frequently and at random. However, being of smaller magnitudes and at lesser depths, very often they are not even felt. Nevertheless, about 75 % of the world’s energy released from earthquakes is from shallow-focus ones.DEEP FOCUS earthquakes or “intra plate” earthquakes, occur within the sub-ducting oceanic plates as they move beneath the continental plates. Appearing along fault lines, these are earthquakes with focus much deeper within the earth. A deep focus earthquake occurs when two tectonic plates slide towards one another followed by subduction, or when the mineral olivine is in a transitional phase.These are typical of the subduction zone of the earth which are seismically active zones, often existing in patterns as in Wadati-Benioff zones. They happen as huge quakes with larger magnitudes, as a great deal of energy is released with the forceful collision of the plates.This website lists the differences but you'll not be able to say which has more or less impact without looking at the place the earthquake is in (i.e. do they have earthquake proof buildings)]
http://www.actforlibraries.org/diffe...s-earthquakes/
5. Shallow focus earthquakes occur between 0-70km depth, and deep focus earthquakes occur between 300-700km depth. Shallow focus earthquakes are generally of smaller magnitude and happen frequently, whereas deep focus earthquakes are often of large magnitude but occur less frequently. Therefore, shallow earthquakes tend to cause most surface damage because they are felt more often and the shaking is more pronounced

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