Analysis of Broadband Far-Field Seismic Radiation for the January 17, 1994 Northridge, California Earthquake

1994 年 1 月 17 日加利福尼亚州北岭地震的宽带远场地震辐射分析

• 批准号: 9416342
• 负责人: Jiajun Zhang
• 金额: $ 3万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416342&HistoricalAwards=false
• 关键词: Analysis; Broadband; Far; Field; Seismic

9416342 Zhang This research is to determine source parameters of the Northridge earthquake that can be best resolved with broadband and long-period regional and teleseismic recordings. Parameters include total seismic moment, total rupture duration and the overall source geometry. Techniques to be used include complete waveform inversion of body wave and surface wave signals using an aspherical earth model with a centroid-moment tensor inversion approach; spectral inversion of fundamental mode surface waves with propagation corrections for an aspherical model; body and surface wave deconvolutions using empirical and theoretical Green's functions; and a combined broadband body waveform/surface wave spectra inversion for extracting a very broadband source model. The analysis will provide characterization of the long-period far- field source radiation, yielding basic constraints on the energy release, duration, and geometry of the faulting, which must be satisfied by more detailed models striving to match observed near- field motion. This project is a contribution to the National Earthquake Hazard Reduction Program and is supported by the Northridge Earthquake Emergency Appropriation. ***

小行星9416342 这项研究是为了确定北岭地震的震源参数，可以最好地解决了宽带和长周期的区域和地震记录。 参数包括总地震矩、总破裂持续时间和总体震源几何形状。 将使用的技术包括使用具有质心矩张量反演方法的非球面地球模型的体波和表面波信号的完整波形反演;具有非球面模型的传播校正的基模表面波的谱反演;使用经验和理论绿色函数的体波和表面波去卷积;以及用于提取非常宽频带的源模型的组合的宽频带体波形/表面波谱反演。 该分析将提供长周期远场源辐射的表征，产生对能量释放、持续时间和断层几何形状的基本约束，这些约束必须通过更详细的模型来满足，以努力匹配观察到的近场运动。 该项目是对国家地震减灾计划的贡献，并得到北岭地震紧急拨款的支持。 ***