Assertion: earthquake | /r/HasProperty | the most powerful earthquake
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Source sentences:
text: The temblor was the strongest to strike the region since the magnitude-9.5 event of 1960, considered to be the most powerful earthquake ever recorded.
text: The earthquake was one of the most widely felt in U.S. history, largely affecting 23 states over an area of 580,000 square miles (1,500,000 km2).