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Seismologists sometimes refer to a pair of similarly sized earthquake shocks that occur relatively closely spaced in time and location as an earthquake "doublet."  This is distinct from the normal pattern of earthquake aftershocks. The first earthquake can be some considerable distance and time away from the second. The magnitude of the second quake may be slightly larger than the first as well. This type of earthquake occurs once or twice almost every year but are far rarer than more typical earthquakes. There may also be examples of triplet earthquakes such as the 2010 Mindanao earthquakes.
- Worldwide doublets of large shallow earthquakes
- A great earthquake doublet and seismic stress transfer cycle in the central Kuril islands
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