NEHRP Clearinghouse
 Title
 Estimation of Seismic Source Processes Using Strong Motion Array Data.
 File

PB93114551.pdf
 Author(s)
 Chiou, S. J.
 Source

National Science Foundation, Washington, DC.,
July 1991,
152 p.
 Identifying Number(s)
 UCB/EERC91/07
 Abstract
 The problem of estimating fault rupture processes using seismic strong motion array data recorded at nearsource distances is addressed in the report. Practical algorithms for source mapping and uncertainty assessment are developed. The parameters that define the rupture process in the study are the origen time and location of the fault rupture subevents that are responsible for the recorded nearsource ground acceleration. The developed procedures are applied to the strong motion array data of the July 30, 1986 Taiwan earthquake recorded at the SMART1 (Strong Motion Array Taiwan, 1) array. The earthquake has a suitable magnitude (ML sub 6.2) and distance (epicentral distance 7 km) for the application of array measurement of source processes using the developed theory. The wavefield recorded at the prototype array, such as SMART1, is represented as the superposition of propagating plane waves whose horizontal slowness vectors and arrival times are functions of the subevent positions and origen times. The planewave assumption provides the physical model relating the source ruptureprocess parameters and the array recordings of wave motion generated by a moving seismic source.
 Keywords
 Mapping; Ray tracing; Seismic epicenter; Prototypes; Earthquakes; Measurement; Acceleration; Magnitude; Rupture; Earth crust; Mathematical models; Seismology; Arrays; Algorithms; SMART1 (Strong Motion Array Taiwan 1); Geological faults; Motion