
Are the following mentions coreferent?:
<m> 6 . 1 - magnitude quake </m> in A powerful 6. 1 - magnitude earthquake strikes the northern Indonesian province of Aceh, killing at least three people and injuring dozens more across the affected region. According to the US Geological Survey, the quake hit at a depth of 10 kilometers ( 6 miles ) in the Northern Province of Aceh. Last year, a 6. 4 - magnitude quake rocked the west coast of Sumatra Island, killing at least one person. 
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<m> quakes </m> in Indonesia's Meteorology and Geophysics Agency ( BGE) said that there were two powerful earthquakes which flattened buildings and killed at least one person. 