water-quake
/ˈwɔːtəkweɪk/noun
A seismic disturbance on the sea floor, or experienced at sea. Also: a sudden flood, massive wave, etc., reminiscent of that caused by an earthquake.
Origin
Late 16th century; earliest use found in Raphael Holinshed (c1525–?1580), historian. From water + quake, after earthquake.