This type of data can be used by scientists to predict volcanic eruptions because it provides them with information about the activity of the volcano. The seismometer measures the strength of earthquakes, which can indicate when an eruption is imminent. Visual observations can also provide valuable information about changes in the volcano, such as ash clouds or tremors, which can be indicators of an upcoming eruption. By monitoring the data over a period of time, scientists are able to get a better understanding of the volcano's behavior and use it to predict when it will erupt.