The Effect of Sonic Booms on Earthquake Warning Systems

摘要: Several aerospace companies are designing quiet supersonic business jets for service over the United States. These aircraft have potential to increase occurrence of mild sonic booms across country. This leads interest among earthquake warning (EQW) developers and general seismological community in characterizing effect on seismic sensors field, their impact EQW systems, means discriminating signatures from those earthquakes. The SonicBREWS project (Sonic Boom Resistant Earthquake Warning Systems) is a collaborative effort between Seismic Systems, Inc. (SWS) NASA Dryden Flight Research Center. aims evaluate effects sensors. study consists exposing high-sample-rate (1000 sps) triaxial accelerometers with overpressures ranging 10 600 Pa free field built environment. record coupling boom ground surrounding structures, while microphones acoustic wave above near sensor. Sonic broadband signals more high-frequency content than Even 1000 sps accelerometer will produce significantly aliased record. Thus observed peak velocity strongly dependent sampling rate, increases as rate reduced. At we observe velocities that exceed P-waves ML 3 earthquakes at local distances, suggesting not negligible applications. We present results several experiments conducted under showing typical-case low amplitude worst-case high booms. show various sensor placements array geometries. Finally, suggest possible avenues purposes EQW.