They owe their formation to tectonic movements, subsidences of the surface.
The earthquakes in New Zealand are evidently of the tectonic type.
That tectonic earthquakes are closely connected with the formation of faults seems now established beyond doubt.
In all respects, tectonic earthquakes differ widely from the Ischian shocks.
Distinctions, so great as these are, evidently remove the Ischian shocks from the category of tectonic earthquakes.
That this quake was of the tectonic type was evident from the great fault that was formed.
The great San Francisco earthquake of April 18th, 1906, appears to have been a tectonic quake.
That this quake was of the tectonic type became evident, when several faults were found in the ground afterwards.
The character of these tectonic activities has differed widely in different parts of the cordillera.
A crossroads of fault lines, a confluence of tectonic clashes – the Balkan always obliged.