Investigating the point seismic array concept with seismic rotation measurements.

Abbott, Robert E. ; Aldridge, David Franklin

关键词: AR FACILITIES;    ACCELERATION;    ALGORITHMS;    DATA PROCESSING;    MAINTENANCE;    NEVADA;    ROTATION;    SEISMIC ARRAYS;    SEISMIC WAVES;    SHEAR;    SIMULATION;    VECTORS;    VELOCITY;    YUCCA MOUNTAIN Seismometers.;    Seismic waves.;    Particle acceleration.;    Seismograms-Congresses.;   

DOI  :  10.2172/978429
RP-ID  :  SAND2009-0798
PID  :  OSTI ID: 978429
Others  :  TRN: US1003127

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Spatially-distributed arrays of seismometers are often utilized to infer the speed and direction of incident seismic waves. Conventionally, individual seismometers of the array measure one or more orthogonal components of rectilinear particle motion (displacement, velocity, or acceleration). The present work demonstrates that measure of both the particle velocity vector and the particle rotation vector at a single point receiver yields sufficient information to discern the type (compressional or shear), speed, and direction of an incident plane seismic wave. Hence, the approach offers the intriguing possibility of dispensing with spatially-extended received arrays, with their many problematic deployment, maintenance, relocation, and post-acquisition data processing issues. This study outlines straightforward mathematical theory underlying the point seismic array concept, and implements a simple cross-correlation scanning algorithm for determining the azimuth of incident seismic waves from measured acceleration and rotation rate data. The algorithm is successfully applied to synthetic seismic data generated by an advanced finite-difference seismic wave propagation modeling algorithm. Application of the same azimuth scanning approach to data acquired at a site near Yucca Mountain, Nevada yields ambiguous, albeit encouraging, results. Practical issues associated with rotational seismometry are recognized as important, but are not addressed in this investigation.