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/EERC-91/07
Abstract
The problem of estimating fault rupture processes using seismic strong motion array data recorded at near-source 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 near-source 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 plane-wave assumption provides the physical model relating the source rupture-process 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