A pair of great <a href="https://en.wikipedia.org/wiki/2012_Indian_Ocean_earthquakes" id="mwAUg" rel="mw:WikiLink" title="2012 Indian Ocean earthquakes">earthquakes</a> occur in the <a href="https://en.wikipedia.org/wiki/Wharton_Basin" id="mwAUk" rel="mw:WikiLink" title="Wharton Basin">Wharton Basin</a> west of <a href="https://en.wikipedia.org/wiki/Sumatra" id="mwAUo" rel="mw:WikiLink" title="Sumatra">Sumatra</a> in <a href="https://en.wikipedia.org/wiki/Indonesia" id="mwAUs" rel="mw:WikiLink" title="Indonesia">Indonesia</a>. The maximum <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Mercalli_intensity_scale" id="mwAUw" rel="mw:WikiLink" title="Mercalli intensity scale">Mercalli intensity</a> of this <a href="https://en.wikipedia.org/wiki/Fault_(geology)#Strike-slip_faults" id="mwAU0" rel="mw:WikiLink" title="Fault (geology)">strike-slip</a> <a href="https://en.wikipedia.org/wiki/Doublet_earthquake" id="mwAU4" rel="mw:WikiLink" title="Doublet earthquake">doublet earthquake</a> is VII (<i id="mwAU8">Very strong</i>). Ten are killed, twelve are injured, and a non-destructive <a href="https://en.wikipedia.org/wiki/Tsunami" id="mwAVA" rel="mw:WikiLink" title="Tsunami">tsunami</a> is observed on the island of <a href="https://en.wikipedia.org/wiki/Nias" id="mwAVE" rel="mw:WikiLink" title="Nias">Nias</a>.