Tags Volcanoes/Volcanic Eruptions

Tag: Volcanoes/Volcanic Eruptions

Volcanoes/Volcanic Eruptions – Mitigation (Actions Before, During, After)

Unfortunately volcanic eruptions cannot be prevented. However, as a volcano becomes active, it gives off a number of warning signs. These warning signs are picked up by volcanologists, the volcano is monitored, and recommended actions are given to people in the immediate area.

Volcanoes/Volcanic Eruptions – Vulnerability Assessment

Volcanic eruptions are most likely to occur in the Pacific Rim states and the danger area around a volcano covers approximately a 20-mile radius, although there is some danger to people within 100 miles or more. Airborne ash from a volcano can affect people hundreds of miles away from the eruption.

Volcanoes/Volcanic Eruptions – Warning Alert Notifications

The USGS Volcano Hazards Program issues four-tiered Volcano Alert Levels of Normal, Advisory, Watch, and Warning. The Volcano Alert Levels are intended to inform people on the ground about a volcano's status and are issued in conjunction with the Aviation Color Code. Notifications are issued for both increasing and decreasing volcanic activity.

Volcano Hazards Program

The USGS Volcano Hazards Program monitors active and potentially active volcanoes, assesses their hazards, responds to volcanic crises, and conducts research on how volcanoes work.

Volcanoes/Volcanic Eruptions – Links and Resources

Related links and resources for volcanoes and volcanic eruptions.

Volcanoes/Volcanic Eruptions – Notable

Table of notable volcanic eruptions:

Volcanoes/Volcanic Eruptions – Types and Classifications

Geologists generally group volcanoes into four main kinds: cinder cones, stratovolcanoes or composite volcanoes, shield volcanoes, and lava domes.

Volcanoes/Volcanic Eruptions – Associated Hazards

Volcanic eruptions often force people living near volcanoes to abandon their land and homes. Those living farther away are likely to avoid complete destruction, but associated hazards such as gases, lahars, landslides, flooding, lava flows, pyroclastic flows, tephra, and ash can still be damaging.

Volcanoes/Volcanic Eruptions – Introduction

A volcano is a mountain that opens downward to a reservoir of molten rock below the surface of the earth. Unlike most mountains, which are pushed up from below, volcanoes are vents through which molten rock escapes to the earth’s surface. When pressure from gases within the molten rock becomes too great, an eruption occurs.