Explosive volcanic eruptions can be dangerous and deadly. They can blast out clouds of hot tephra from the side or top of a volcano. These fiery clouds race down mountainsides …

The USGS Volcano Hazards Program (VHP) and its monitoring partners work to detect the earliest signals of volcanic unrest to forewarn communities at-risk and provide time for officials …

Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years.

Volcanoes can impact climate change. During major explosive eruptions huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere. Injected ash falls …

However, volcanoes can only be triggered into eruption by nearby tectonic earthquakes if they are already poised to erupt. This requires two conditions to be met: Enough "eruptible" magma …

The earthquakes were most likely caused by an intrusion of magma beneath the volcano. Two large earthquakes (each about magnitude 6.5) destroyed houses, water tanks, stone fences, …

Aug 23, 2022 · USGS also employs a nationwide volcano alert-level system for characterizing conditions (quiet, unrest, eruption) at U.S. volcanoes. Learn more about all alert and …

Many of these volcanoes have erupted in the recent past and will erupt again in the foreseeable future. As populations increase, areas near volcanoes are being developed and aviation …

Although Mount Rainier has not produced a significant eruption in the past 500 years, it is potentially the most dangerous volcano in the Cascade Range because of its great height, …

During the recent eruption, HVO staff are collecting data related to earthquakes, volcanic gas emissions, ground deformation, and fissure/lava lake behavior, in order to understand how the …