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Earthquakes originate at a point called the focus (plural foci). From this point, energy travels outward in different types of waves. The place on the Earth’s surface directly above the focus is called the epicenter (Figure 13.2).
The focus is point inside the earth where the earthquake started, sometimes called the hypocenter, and the point on the surface of the earth directly above the focus is called the epicenter. There are two ways by which we can measure the strength of an earthquake: magnitude and intensity.
The focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.
The epicenter is on the Earth’s surface vertically above the point of rupture (focus). The epicenter is also where most news reports are because it is the center where people are affected. The focus is the point along the fault plane from which the seismic waves spread outward.
Focus and Epicenter. The point of initial breaking or rupturing, where the displacement of rocks occurs along the rupture surface, is called the focus. The focus is always at some depth below the ground surface in the crust, and not at the surface, as shows in Figure 5.3.1.
Feb 15, 2021 · A focus is the point below the Earth's surface where seismic waves originate during an earthquake (Figure 3.14). An epicenter is the point on the Earth’s surface above the point at depth in the Earth’s crust where an earthquake begins.
The epicenter is the point on a land surface vertically above the hypocenter. The earthquake focus, also called the hypocenter , is the initial point of rupture and displacement of the rock moves from the hypocenter along the fault surface.
