Faulting Processes of Blind Thrust Earthquakes

盲冲断地震的断层过程

• 批准号: 8803397
• 负责人: Jeffrey Barker
• 金额: $ 7.6万
• 依托单位: SUNY at Binghamton
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803397&HistoricalAwards=false
• 关键词: Faulting; Processes; Blind; Thrust; Earthquakes

The proposed research includes a multi-stage approach to modeling the detailed faulting processes of three blind thrust earthquakes: the 1983 Coalinga earthquake, the 1985 Nahanni earthquake, and the 1987 Whittier Narrows earthquake. We begin by estimating fault orientation by moment tensor inversion of long- period, teleseismic body and surface waves. Source multiplicity, changes in orientation in space or time, and other gross details of rupture will be determined by forward modeling WWSSN long- period and GDSN intermediate- and short-period, teleseismic data. Slip distribution asperity models will be derived by simultaneous inversion of the teleseismic data along with strong-motion data integrated to ground velocity. Finally, details of the asperity model in terms of static slip, slip rate and rupture velocity variations will be modeled using a semi-empirical simulation method with local acceleration data. The models will be interpreted in terms of the rupture processes of blind thrusts, and compared to events of other types for which detailed faulting models are available.

提出的研究包括采用多阶段方法对1983年Coalinga地震、1985年Nahanni地震和1987年Whittier Narrows地震三次盲逆冲地震的详细断层过程进行建模。首先利用长周期、远震体波和面波的矩张量反演估计断层方位。通过对WWSSN长周期和GDSN中期和短周期远震数据进行正演模拟，可以确定震源的多样性、空间或时间方向的变化以及破裂的其他大致细节。将远震数据与强震数据结合地面速度进行同步反演，推导出滑差分布模型。最后，我们将利用半经验模拟的方法，利用局部加速度数据，对静态滑移、滑移率和破裂速度变化方面的粗糙度模型的细节进行建模。这些模型将根据盲逆冲断裂过程进行解释，并与其他类型的事件进行比较，这些事件有详细的断层模型可用。