Perhaps a seismic disturbance had caused a section of the cavern to collapse and block the river's flow.

Our sensors have just detected a seismic disturbance of some kind in the Aphrodite region.

If this magnitude of seismic disturbance continues, Vagabond will break up within the next 10 hours.

Describes techniques used to detect, record, measure, and predict seismic disturbances.

It's connected with that seismic disturbance a few days ago.

"My understanding is that they've been having a number of seismic disturbances as well," Lefler noted.

The seismic disturbances, they said, were rapidly nearing the surface.

But now that the ship had become an all too permanent land structure, it was shaken every few hours by seismic disturbances.

It was a shallow fissure, perhaps twice the breadth of his body, created probably by a recent seismic disturbance.

"Is there indication of seismic disturbance due to their presence?"