@ ŒfÚŽGŽi˜ajF “ú–{’nkHŠwƒVƒ“ƒ|ƒWƒEƒ€˜_•¶W VolF 9-3Šª ”NF 1994”N •ÅF E.91-E.96•Å ’˜ŽÒi˜ajF - ƒ^ƒCƒgƒ‹i˜ajF - ´˜^i˜ajF
- ƒL[ƒ[ƒhi˜ajF - ŒfÚŽGŽi‰pjF PROCEEDINGS OF THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒi‰pjF Masahiro IIDA, Paul SPUDICH ƒ^ƒCƒgƒ‹i‰pjF ESTIMATION OF HETEROGENEITY IN SHALLOW STRUCTURE AND SEISMIC RISK BY WAVEFORM SCATTERER INVERSION OF MICROEARTHQUAKES ´˜^i‰pjF
We use single-station waveform recordings of widely distributed microearthquake sources to identify heterogeneities in the earth's crust. On the basis of reasonable theory, our deterministic inverse approach has quite different advantages from downhole and microtremor measurements. The key concept is that the complicated wave field produced by heterogeneous structure and irregular surface topography can be expressed by complicated artificial sources acting in a simple structure. This approach is applied to aftershock recordings from the 1986 North Palm Springs, California earthquake. Horizontal components of velocity records are used, which are filtered 2 to 4 Hz. We assume a grid of scatterers with an interval of 2 km on the ground surface. The scatterer power distribution is not symmetric about the station, and we find a large power peak to the west of the station. ƒL[ƒ[ƒhi‰pjF - ‹LŽ–‹æ•ªF - ‹æ•ª @@@ˆÏˆõ‰ï˜_•¶W