Waveform-Based Earthquake Location

EAR-0074084 Beroza，Gregory这项研究使用波形互相关来测量相似地震之间精确的差异到达时间。这些精确的测量被用来估计准确的相对事件位置。该方法不是估计绝对震源位置，而是解决了地震震源之间的矢量位置差异。通过这样做，人们能够显著减少地震位置的误差。这项技术目前正在扩展，以处理更大的数据集，多达约100,000次地震，使用这两种分层反演方案。这种解决一些研究问题的能力，包括：最近在断裂带发现的地震活动条纹的起源是什么？主要断层附近的应力状态如何？随着断裂带的成熟，可以对应变局部化施加什么约束？关于深部断层上摩擦力的时间依赖性，我们能了解到什么？地震活动与无震区和地震滑移区之间有何关系？

EAR-0074084Beroza, GregoryThis research measures precise differential arrival times between similar earthquakes earthquakes using waveform cross-correlation. These precise measurements are used to estimate accurate relative event locations. Rather than estimate absolute hypocentral location, the method solves for the vector position difference between earthquake hypocenters. In doing so one is able to reduce dramatically errors in earthquake locations. The technique is currently being extended to work with much larger data sets, up to ~100,000 earthquakes, using both a hierarchical inversion scheme. This capability to address a number of research issues, including: what is the origin of recently discovered seismicity streaks in fault zones? What is the state of stress in close proximity to major faults? What constraints can be placed on strain localization as a fault zone matures? What can we learn about the time-dependent nature of friction on faults at depth? How is seismicity related to regions of aseismic versus seismic slip?