| 摘要 |
PROBLEM TO BE SOLVED: To provide a determination method of the time and the position of an earthquake source by earthquake wave observation data for estimating an earthquake source element and its accuracy by a high-degree arrival/non arrival time method by using one or more earthquake wave observation data. SOLUTION: Concerning one side of a hyperboloid Ci1, a=0 in the case of t=t1, and Ci1 becomes a plane (X=0), and it can be said that the earthquake source is in a domain (Di1) on the point S1 side of a plane of symmetry (X=0) of Si. Also as for an optional observation point Si, since the similar restriction is imposed, the earthquake source is inside a prism which is a common domain of Di1. In this case, as for the depth, a restriction known from an earthquake activity is used. WhenΔt becomes large, Ci1 becomes a sharper curved surface, moves toward the point S1 and shrinks, and thereby the domain Di1 where the earthquake source can exist becomes smaller, and an estimated value becomes more accurate. COPYRIGHT: (C)2006,JPO&NCIPI |
