Brilliantly colored sunrises and sunsets
The Richter scale measures earthquakes, not volcanic eruptions. Eruptions are rated on the Volcanic Explosive Index. On this scale, the 1991 eruption of Mount Pinatubo was a VEI 6.
The kinds of eruptions are the quiet eruptions and the explosive eruptions.
Non-explosive and Explosive
There are effusive eruptions and explosive eruptions.
Some major volcanic eruptions since 1990 include Mount Pinatubo in the Philippines in 1991, Mount Unzen in Japan in 1991, Mount Merapi in Indonesia in 2010, Eyjafjallajökull in Iceland in 2010, and Kilauea in Hawaii in 2018. These eruptions had significant impacts on the local environment and sometimes global climate.
Volcanic explosive index is a measure of how explosive a volcanic eruption is based largely on the amount of material released. It ranges from VEI-0 for non explosive eruptions to VEI-8 for massive super eruptions.
No. Volcanic eruptions in Hawaii are not usually explosive.
Flow, and explosive
Pahoehoe is one substance usually not present in explosive volcanic eruptions. Tephra, lava and other gasses are typically present during an eruption.
There are two main types of volcanic eruptions: Explosive and Nonexplosive eruptions.
Shield volcanoes have effusive eruptions. Effusive eruptions are a volcanic phenomenon; in some ways the opposite of explosive eruptions. An effusive eruption is characterized by an outpouring of low viscosity lava which has a fairly low volatile content. Usually, shield volcanoes have effusive eruptions.
explosive, produces lahars and volcanic ash clouds.