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Erupting  volcanos can have a dramatic effect on weather worldwide but especially to areas local to the volcano.There are many active volcanos in Europe
especially in the Mediterranean area and webcam
images from these volcanos appear at the top of those shown below. Often accompanying and indeed
preceding violent eruptions are earthquakes possibly accompanied in certain conditions by Tsunamis.

(see the Earthquake & Tsunami pages on this website for further information regarding  this)

Helicorders and seismograms shown on this page are either located on or near the volcano in question or in the general geographical area.

Stromboli, Italy

                 Mount Vesuviuas                                                                                                  Mount Etna

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         Teide, Canary Islands                           Cumbre Vieja, La Palma                     El Hierro, Canary Islands

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                  Pico, Azores                                    Santorini Cauldera                             

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Iceland Volcanos

Iceland Volcano Seismographs

        Katla & Eyjafjallajökull, Iceland                      Hekla, Iceland                             Bárðarbunga, Iceland

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Steps of the VEI Scale

The VEI scale begins at 0 for eruptions that produce less than 0.0001 cubic kilometer of ejecta. Most of these eruptions are very small in size. However, some of them are "effusive" rather than being "explosive." Effusive eruptions are characterized by lava flowing from the vent instead of ejecta being blasted from the vent.

Eruptions rated at VEI 1 produce between 0.0001 and 0.001 cubic kilometers of ejecta. Above VEI 1, the scale becomes logarithmic, meaning that each step in the scale represents a 10X increase in the amount of material ejected. 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.

With each step in the scale representing an explosivity increase of 10X, a VEI 5 is roughly ten times more explosive than a VEI 4. Two steps of the scale is an increase of 100X in explosivity. For example, a VEI 6 is roughly 100 times more explosive than a VEI 4. A VEI 8 is one million times more explosive than a VEI 2. All of this is based upon ejecta volume.

Because each step of the scale is a 10X increase in material ejected, there is an enormous difference in the size of an eruption on the low end of a step and an eruption on the high end of a step. For this reason, a "+" is often added to eruptions that are known to be on the upper end of their step. For example, the eruption of Katla in Southern Iceland on October 12, 1918 was rated at VEI 4+ because the eruption was a very strong VEI 4.