The most recent volcanic activity was about 11,000 years ago.

The region shows much evidence of volcanic activity in the last 5000 years.

As a result, there was a great deal of volcanic activity.

This is the part of the island with most recent volcanic activity.

There is no sign of volcanic activity with these events.

The southern end of the island had more volcanic activity than the north.

For the past two days the volcanic activity in the north had become more intense.

The age of the most recent volcanic activity is also unknown.

The rock was formed over 1.5 billion years ago by volcanic activity.

He believed this to be the result of volcanic or related activity.