Surface distance from an earthquake epicenter to a receiver. It differs from hypocentral distance when the source has nonzero depth.
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Epicentral distance is the distance measured from the epicenter of an earthquake to a specific point, usually a seismic station or observation point on the Earth's surface. The epicenter is the point on the Earth's surface directly above the focus (or hypocenter), where the earthquake originates. Epicentral distance is typically expressed in kilometers or miles.