Assertion: volcano's flank | /r/Synonym | the hilina slump
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Source sentences:
text: Mauna Loa is slumping eastward along its southwestern rift zone, leveraging its mass into Kīlauea and driving the latter eastward at a rate of about 10 cm (4 in) per year; the interaction between the two volcanoes in this manner has generated a number of large earthquakes in the past, and has resulted in a significant area of debris off of Kīlauea's seaward flank known as the Hilina Slump.