LISBON—Volcano-tectonic tremors, which indicate the movement of magma, were recorded on the earthquake-hit mid-Atlantic Azores island of Sao Jorge for the first time since a worrying seismic crisis began more than two weeks ago, authorities said on Wednesday.
The lush green volcanic island, in Portugal’s Azores archipelago, has been hit by 27,626 small tremors and there are fears the activity could herald an eruption or a powerful earthquake.
