The volcanic explosivity index (VEI) is a scale used to measure the size of explosive volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982.

2022年12月26日 · The biggest explosive eruptions—so-called “super eruptions”—are VEI 8 or, in the case of the Toba (Indonesia) eruption 74,000 years ago, possibly VEI 9. These are epically big eruptions, with ash-deposit volumes in excess of 1000 cubic kilometers (240 cubic miles) and ash plumes that reach the stratosphere, usually occurring over many ...

Could eruptions larger than Toba, Yellowstone, and other VEI 8 events occur? Does Earth have the ability to produce a blast capable of launching the 10,000 cubic kilometers of ejecta needed to rate a VEI 9 eruption? It is possible that evidence for a VEI 9 eruption exists and is buried in the geologic record.

2022年8月5日 · The Volcanic Explosivity Index (VEI) is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.

火山爆发指数（Volcanic Explosivity Index，简称VEI）是1982年美国地质调查局的纽豪尔教授（Chris Newhall）和夏威夷大学马诺阿分校的斯蒂芬·塞尔夫提出的量表，以喷出物体积、火山云和定性观测用来量度火山爆发的强烈程度。

So, the geological events for a hypothesised VEI-9 eruption would need (adapted from de Silva): the development of a magma chamber that could support the magma that would be fragmented to produce at least 10,000+ km$^3$ of volcanic ash - this would probably result in major uplift in the area, with faulting around the edges.

火山爆發指數（Volcanic Explosivity Index，簡稱VEI）是1982年美國地質調查局（USGS）的克里斯·紐豪爾教授（Chris Newhall）和夏威夷大學馬諾阿分校的斯蒂芬·塞爾夫提出的量表，以噴出物體積、火山雲和定性觀測用來量度火山爆發的強烈程度。

2010年11月10日 · Scientists with the U.S. Geological Survey use the Volcano Explosivity Index (VEI) to measure the magnitude of volcanic blasts. It's a logarithmic scale that runs from 1 to 8.

The United States Geological Survey (USGS) provides a freely downloadable Volcanic Explosivity Index (VEI) that describes the size of an explosive volcanic eruption. You can access this table and link to the USGS Volcano Hazard website for further information.

In this 4th episode, we compare the scale, power and size of several infamous volcanoes and how they compare in size to others. From VEI index 1 to 8, we compare the power of eruptions of...