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- Q1758272 subject Q6274804.
- Q1758272 abstract "A pyroclastic surge is a fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions. It is similar to a pyroclastic flow but it has a lower density or contains a much higher ratio of gas to rock, which makes it more turbulent and allows it to rise over ridges and hills rather than always travel downhill as pyroclastic flows do.The speed of pyroclastic density currents has been measured directly via photography only in the case of Mount St. Helens, where they reached 90–130 m/s (200–290 mph). Estimates of other modern eruptions are around 100 m/s. Pyroclastic flows may generate surges. For example, the city of Saint-Pierre on the Caribbean island of Martinique in 1902 was overcome by one. Pyroclastic surge include 3 types, which are base surge, ash-cloud surge, and ground surge.".
- Q1758272 wikiPageWikiLink Q1639789.
- Q1758272 wikiPageWikiLink Q17054.
- Q1758272 wikiPageWikiLink Q192503.
- Q1758272 wikiPageWikiLink Q193755.
- Q1758272 wikiPageWikiLink Q221616.
- Q1758272 wikiPageWikiLink Q43533.
- Q1758272 wikiPageWikiLink Q4675.
- Q1758272 wikiPageWikiLink Q512121.
- Q1758272 wikiPageWikiLink Q589980.
- Q1758272 wikiPageWikiLink Q6274804.
- Q1758272 wikiPageWikiLink Q664609.
- Q1758272 wikiPageWikiLink Q6647900.
- Q1758272 wikiPageWikiLink Q7263630.
- Q1758272 wikiPageWikiLink Q7692360.
- Q1758272 wikiPageWikiLink Q7940086.
- Q1758272 wikiPageWikiLink Q818475.
- Q1758272 comment "A pyroclastic surge is a fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions. It is similar to a pyroclastic flow but it has a lower density or contains a much higher ratio of gas to rock, which makes it more turbulent and allows it to rise over ridges and hills rather than always travel downhill as pyroclastic flows do.The speed of pyroclastic density currents has been measured directly via photography only in the case of Mount St.".
- Q1758272 label "Pyroclastic surge".