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The hypocenter of the 2011 Tohoku earthquake, which triggered a powerful tsunami, was located about 29 kilometers (18 miles) below the surface of the Pacific Ocean.
The starting point of an earthquake is called the focus or hypocenter, which is located beneath the Earth's surface where the earthquake originates. It is typically several kilometers deep within the Earth's crust.
The Hypocenter
The underground point of origin of an earthquake is called the hypocenter or focus. At this point, the seismic waves are first generated and then spread out in all directions, causing the shaking felt on the surface.
The point underground where an earthquake originates is known as the hypocenter or the focus. This is the specific location within the Earth's crust where the seismic energy is released, leading to the generation of seismic waves that cause the earthquake.