Faulting Processes of Blind Thrust Earthquakes

拟议的研究包括一个多阶段的方法来模拟三次盲目逆冲地震的详细断层过程：1983年的科林加地震、1985年的纳哈尼地震和1987年的惠蒂尔·纳罗斯地震。我们首先通过长周期、远震体和面波的矩张量反演来估计断层的方向。震源的多样性、空间或时间方向的变化以及破裂的其他大体细节将由WWSSN长周期和GDSN中短周期远震数据正演确定。滑移分布粗糙模型将通过远震数据和强震数据积分到地面速度的同时反演而得到。最后，将使用半经验模拟方法和局部加速度数据来模拟粗糙模型中关于静态滑移、滑移率和破裂速度变化的细节。这些模型将根据盲目冲断的破裂过程进行解释，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。

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.