| 摘要 |
A magnitude estimation device (10) is provided with: a concentric circle setting unit (11) which, when an earthquake occurs, divides seismic intensity meters (20) at respective points into groups on the basis of measured seismic intensities, and sets circles that are concentrically related to each other for the respective groups such that seismic intensity meters included in the same group are located on the same circle; and a magnitude estimation unit (12) which substitutes, as the distance from an earthquake source, the distance between the point of the seismic intensity meter (20) and the center of the circle into an equation for obtaining the seismic intensity from the distance from the earthquake source and the value of magnitude, specifies the value of magnitude at which the difference between the seismic intensity obtained from this equation and the seismic intensity measured by the seismic intensity meter is minimized, and estimates the magnitude of the earthquake on the basis of the specified value. |
