BBC: Earthquakes can 'spark eruptions'.
Very large earthquakes can trigger an increase in activity at nearby volcanoes according to a new study.
The controversial findings come from an analysis of records in southern Chile.
It showed that up to four times as many volcanic eruptions occurred during the year following very large earthquakes than did so in other years.
The work, by a team at the University of Oxford, appears in the journal Earth and Planetary Science Letters.
The researchers say volcanoes lying up to at least 500km away from an earthquake's epicentre were affected. ...
The researchers examined the volcanic eruption and earthquake records of southern Chile where, in 1835, Charles Darwin first speculated on the link between earthquakes and eruptions.
By analysing historical records, Sebastian Watt along with Oxford colleagues David Pyle and Tamsin Mather, discovered that volcanic activity increased for about a year after each of the largest earthquakes in southern Chile - those greater than 8.0 magnitude - over the past 150 years.