
Are the following mentions coreferent?:
<m> earthquake </m> in Indonesia's Aceh province was shook by a strong earthquake that struck at a depth of just 10 kilometers and its epicenter was located 55 kilometers ( 34 miles ) west of the town of Bireun on the western tip of Sumatra island. 
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<m> earthquakes </m> in Indonesia's Meteorology and Geophysics Agency ( BMG) said that there were two powerful earthquakes which flattened buildings and killed at least one person. 