Editing Earthquake (section)

==== Normal faults ====
Normal faults occur mainly in areas where the crust is being [[Extensional tectonics|extended]] such as a [[divergent boundary]]. Earthquakes associated with normal faults are generally less than magnitude 7. Maximum magnitudes along many normal faults are even more limited because many of them are located along spreading centers, as in Iceland, where the thickness of the brittle layer is only about {{convert|6|km|spell=in||}}.<ref>Hjaltadóttir S., 2010, "Use of relatively located microearthquakes to map fault patterns and estimate the thickness of the brittle crust in Southwest Iceland"</ref><ref>{{cite web |title=Reports and publications &#124; Seismicity &#124; Icelandic Meteorological office |url=http://en.vedur.is/earthquakes-and-volcanism/reports-and-publications/ |access-date=2011-07-24 |publisher=En.vedur.is |archive-date=2008-04-14 |archive-url=https://web.archive.org/web/20080414235419/http://en.vedur.is/earthquakes-and-volcanism/reports-and-publications/ |url-status=live }}</ref>