Along a plate boundary or a fault line.
Yes. An earthquake may occur in the ocean.
Aftershocks can occur hours or days after an earthquake.
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.
No, the epicenter is not always on a fault line. The epicenter is the point on the Earth's surface directly above where an earthquake originates, which is the focus or hypocenter. Earthquake epicenters can occur both on and off fault lines.
A tsunami is an ocean wave that is caused by an earthquake. It would occur after an earthquake.
Foreshocks can occur hours, days, or even weeks before a larger earthquake, but there is no definitive timeline. Foreshocks are smaller earthquakes that precede a larger mainshock, and their occurrence can vary depending on the specific earthquake event.
on 11th march 2011 at 9.am earthquake occur exactly in japan
Small foreshocks that precede a major earthquake can occur
There is no requirement for nausea to occur due to an earthquake or any other natural phenomenon.
A tsunami could occur at any time, as they are often triggered by something like an earthquake. They are not always down to tidal influences.
No, a tsunami MAY occur after an earthquake, if the epicenter of the quake was underwater. Tsunamis do not always follow an underwater earthquake, though. That adds to people's uncertainty after a quake, especially about whether they should flee to higher ground after a quake.
:D