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GCSE Geography · key term
An earthquake that begins relatively close to the Earth’s surface.
Used by OCR
Specification 1.2a · Paper 1, Paper 3
Revise: Tectonic Plate Movement: EarthquakesFriction can lock sections of the boundary before sudden slipping releases energy. These boundaries can produce large, shallow-focus earthquakes, as along the San Andreas fault in the USA.
Shallow and deep describe the depth of the focus, not the earthquake’s magnitude. Shallow-focus earthquakes can be very powerful.
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