rock·​fall | \ ˈräk-ˌfȯl How to pronounce rockfall (audio) \

Definition of rockfall

: a mass of falling or fallen rocks

Examples of rockfall in a Sentence

Recent Examples on the Web

Seismograms show evidence of a large ice or rockfall event just before 10:40 p.m., according to Steve Malone, a University of Washington Professor Emeritus in Seismology. Evan Bush, The Seattle Times, "‘This would have been an unsurvivable event’: When a glacier crumbles on Mount Rainier," 12 July 2018 That powerful outburst occurred after rockfalls caused the collapse of the Pu'u 'Ō'ō crater at the summit of Kilauea, which had been puffed up like a soufflé filled with red-hot lava. Fox News, "Kilauea volcano could launch 10-ton ballistic boulders in dramatic explosion," 11 May 2018 With the lava in Halema'uma'u, the walls surrounding the dwindling lake are now steep and unstable, and rockfalls are inevitable, said Don Swanson, a geologist with the Hawaiian Volcano Observatory, said at a news conference yesterday. Fox News, "Kilauea volcano could launch 10-ton ballistic boulders in dramatic explosion," 11 May 2018 The observatory said that a large rockfall into a lava lake in the volcano’s crater on Wednesday triggered an explosion that created a column of ash. Amy Harmon, New York Times, "He Couldn’t Save His Car and ‘Star Wars’ Mailbox From the Lava," 9 May 2018 Sulfur dioxide, rockfalls and explosions are the main hazards, the agency says. Angela Fritz, Washington Post, "Watch the lava lake overflow in Hawaii’s Kilauea volcano," 25 Apr. 2018 And changing conditions — such as rockfall that blocks a trail — could leave hikers trapped in the wilderness. Search and rescue efforts, authorities say, would be expensive and dangerous., "Don't do it: 45 people cited for entering Columbia gorge fire area," 18 Jan. 2018 Many of the accidents, the report noted, were preventable, but around 10 percent came from rockfalls. National Geographic, "Fatal Rockslide in Major National Park—What You Need to Know," 28 Sep. 2017 There were 58 rockfalls in Yosemite in 2016, which was slightly lower than in previous years, according to the National Park Service. Alaska Dispatch News, "1 dead, 1 injured in enormous rockfall on Yosemite’s El Capitan," 28 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rockfall.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of rockfall

1901, in the meaning defined above

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Time Traveler for rockfall

The first known use of rockfall was in 1901

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More from Merriam-Webster on rockfall

Rhyming Dictionary: Words that rhyme with rockfall Encyclopedia article about rockfall

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