These values are small compared to the values of previously reported eruptions, which had a similar eruptive sequence from explosive to effusive eruptions.
The eruptive style is more akin to surtseyan eruptions than vulcanian eruptions which are more related to type 1 phreatic activity.
Ballistics and ash emissions typically have less impact compared to type 1 eruptions due to the very wet nature of type 2 eruptions, which tends to restrict the aerial extent of the finer eruptive products.
Unlike Bolivia's political eruptions, which originate from below, Ecuador's are sustained in part by the middle class.
After Usu's last eruptions, which began in 1977 and continued into the next year, two people were killed and 200 homes were destroyed in mud slides.
The Act will also have an impact on the troubled Caribbean island of Montserrat, recently devastated by volcanic eruptions which made much of the island uninhabitable.
Dr Ward's thesis is that the volcanic eruptions which marked the end of the Triassic filled the atmosphere with greenhouse gases such as carbon dioxide.
The main reason is strides in forecasting solar eruptions, which produce auroras big enough and bright enough to extend down from northern latitudes into the lower regions where most people live.
Around 30m years ago, rhinos, camels, giant ground sloths and saber-toothed cats roamed a lush grassland before being buried by a series of volcanic eruptions, which preserved their bones in colourful layers of tuff.
Large meteor impacts and massive volcanic eruptions, which spew out hundreds of thousands of cubic miles of lava over hundreds of thousands of years, are both very rare events, occurring once every tens of millions of years.
They were discovered in rock that was sandwiched between layers from two well-dated volcanic eruptions, which narrowed the fossils' date of origin to within a few tens of millions of years.
