We generally cannot predict when a volcano will erupt next unless it is imminent and the volcano is well-monitored. Kilauea is erupting now, and has been erupting almost continuously for over 30 years with no end in sight.
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The last major eruption of Kilauea, which occurred in 2018, was called the Lower East Rift Zone eruption. This eruption began in May 2018 and lasted until September 2018, causing significant damage to the surrounding areas and prompting evacuations.
Volcanic eruptions are almost as difficult to predict as earthquakes. Any "prediction" would be little better than throwing darts at the calendar.
The last eruption of Hawaii's Hualālai volcano was either in the year 1800 or 1801. It is still active and the next eruption is predicted to occur sometime during this century.
It is currently not known when Popocatepetl will erupt again. It's most recent eruption was on July 4th 2013. It is generally very hard to know when a volcano will erupt though scientists are finding ways to know when to expect one.
Yes, there were signs leading up to the eruption of Eyjafjallajokull in 2010, such as increased seismic activity and swelling of the volcano. However, the exact timing and scale of the eruption were difficult to predict accurately.
Scientists predicted the eruption of Mount Pinatubo by monitoring various volcanic precursors, such as increased seismic activity, deformation of the volcano's surface, and gas emissions. These signs allowed researchers to forecast the eruption and issue warnings to evacuate nearby communities.
Probably the biggest problem with earthquakes is that they can't be predicted.
Yes, the eruption of the Soufriere Hills volcano in Montserrat in 1995 was preceded by signs of increased volcanic activity, including earthquakes, gas emissions, and ground deformation. Scientists had been monitoring the volcano and had issued warnings about the potential for an eruption.
The eruption of Krakatau in 1883 was not predicted using modern scientific methods, as volcanology was still in its infancy at the time. However, there were some signs of volcanic activity, including increased seismic activity and changes in the island's landscape. Local residents reported unusual noises and ash emissions prior to the eruption. Despite these warning signs, the scale and impact of the eruption were largely unforeseen.