NEHRP Clearinghouse
- Title
- Estimation of Seismic Wave Coherency and Rupture Velocity Using the SMART 1 (Strong Motion Array Taiwan, Number 1) Strong-Motion Array Recordings.
- File
- PB86214343.pdf
- Author(s)
- Abrahamson, N. A.
- Source
- National Science Foundation, Washington, DC., March 1985, 141 p.
- Identifying Number(s)
- UCB/EERC-85/02
- Abstract
- The January 29, 1981 Taiwan earthquake (M sub L = 6.7) was recorded digitally by 27 triaxial force-balanced accelerometers in the SMART 1 strong motion array centered 30 km north-northwest of the epicenter. The seismic source of this event had a reverse mechanism with unilateral rupture from east to west. The array recordings are used to make direct measurements of the wave coherency and the time dependent rupture velocity. Frequency-wavenumber analysis shows that across the 4 km array, the P waves contain coherent energy from the source region at frequencies up to 6 Hz while the S waves contain coherent energy up to 3 Hz. Significant energy is present in the P and S waves at frequencies above these two levels, but it is incoherent or scattered energy.
- Keywords
- Taiwan; Seismic waves; Bursting; Smart 1; Seismic epicenter; Earthquake engineering; Velocity; Coherence; Seismic effects; Earthquakes