ERTH 2415 Lecture Notes - Lecture 5: Hypocenter, Subduction, Volcanism
19 Jan 2017
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Document Summary
Zero being the most common and least severe. 8. 5 being the least common and most severe. Hypocenter depth: shallow (0-100 km) intermediate (100-300) and deep (300-700) Earthquakes and volcano"s do not occur in random locations. And are more frequent in certain tectonic environments: spreading centers: stress is released in frequent, strong and shallow earthquakes. Lithosphere centers over a hot region at depths. Increase in heat causes earth"s lithosphere to bulge up in a dome. Area id pulled apart by tension, rocks begin to fracture. Failed rifts: some rifts do not fully develop past stage 3 meaning they do not develop new oceans: convergent zones and earthquakes: this causes infrequent an great earthquakes occurring at all 3 depths. >100km: transformation faults: stress is released in infrequent major and shallow earthquakes, hot spots: tension and compression forces causing frequent, strong and shallow earthquakes. These shallow earthquakes occur bellow the volcano base.
