Assertion: seamount's flank | /r/CapableOf | create a 1.8 km-wide
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Source sentences:
text: Approximately 5,600 years ago, volcanism or volcanic precursors triggered a massive avalanche of already weak, hydrothermally altered rocks on the northeast flank and summit, which created a 1.8 km-wide (1 mi-wide) horseshoe-shaped crater opening to the northeast.