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.

VEI 2 eruptions produce between 0.001 and 0.01 cubic kilometers of ejecta. VEI 3 eruptions produce between 0.01 and 0.1 cubic kilometers of ejecta. The progression of the scale from VEI 0 to VEI 8 is shown in the diagram on this page.

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。

2022年12月26日 · A common scale for expressing the size of an explosive volcanic eruption is the VEI—Volcanic Explosivity Index. Eruption size can’t be determined by instruments, so this scale is based on a combination of measurements and observations.

Volcanic eruptions that rated 3 on the volcanic explosivity index. Such eruptions release a tephra volume of at least 0.01 km 3 (0.0024 cu mi) with noticeable effects on the surrounding area. For smaller volcanic eruptions that have produced at least 0.01 km 3 (0.0024 cu mi) of tephra at a time, see Category:VEI-2 eruptions .

The Volcanic Explosivity Index gives us a way to measure the relative explosiveness of volcanic eruptions. It measures how much volcanic material is ejected, the height of the material thrown into the atmosphere, and how long the eruptions last.

2008年2月29日 · 上图表示喷发柱高度、总喷发质量与爆发指数VEI的关系，图中三角形根据具体的火山的喷发柱高度与总喷发质量作出，数字表示VEI 火山喷发柱的最大高度为56公里，喷发的最大的体积1000km 3 ( 63万年前黄石公园),若考虑2百万年前的喷发，则喷发体积为2500 km 3 。

非爆炸性喷发的火山（如夏威夷群岛上的一些火山）VEI为0，爆炸性喷发的火山VEI从1到8，每增加1个单位，其释放的能量就增加1个量级，喷发周期也相应延长。 VEI-1火山喷出物体积小于0.001立方千米，喷发柱高度在0.1～1千米。 VEI-2火山喷出物体积在0.001～0.01立方千米，喷发柱高度在1～5千米。 VEI-3火山喷出物体积在0.01～0.1立方千米，喷发柱高度在3～15千米。 分水岭 VEI-4火山喷出物体积在0.1～1立方千米，喷发柱高度在10～25千米。 超过珠穆朗玛峰。 …

2022年2月4日 · （Volcanic Explosivity Index，简称VEI） 是1982年由火山学家提出的以喷出物体积与喷发柱高度来衡量火山爆发强烈程度的量表。 非爆炸性喷发的火山（如夏威夷群岛上的一些火山）VEI为0，爆炸性喷发的火山VEI从1到8，每增加1个单位，其释放的能量就增加1个量级，喷发 ...