After Shock
This is known as an aftershock.
after shock
NOUN:: A minor tremor of the earth that precedes a larger earthquake originating at approximately the same location. NOUN:: A minor tremor of the earth that precedes a larger earthquake originating at approximately the same location.
No. An aftershock is a secondary earthquake following a larger one. A tsunami is not an earthquake.
It is called an aftershock.
Not necessarily. A small earthquake does not always indicate that a larger earthquake is imminent. Earthquakes are unpredictable, and it is not possible to accurately forecast when or where a larger earthquake will occur based on smaller ones.
A seaquake is a type of earthquake that occurs under the seafloor.
Earthquake
It is called a tremor.
How far away the epicenter is.
Most small earthquakes are just background seismicity. There is no way to tell whether a small event will be followed by a larger one. But if there is a larger earthquake afterwards, the first earthquake is called a "foreshock"
Aftershocks are smaller earthquakes that occur after a larger event (the mainshock) in the same area. If an even larger earthquake occurs, then the original mainshock becomes a foreshock and the bigger event becomes the mainshock.