Waveform-Based Earthquake Location

beroza， gregory这项研究使用波形互相关测量了相似地震之间精确的差分到达时间。这些精确的测量被用来估计准确的相对事件位置。该方法不是估计震源的绝对位置，而是求解震源之间的矢量位置差。这样做可以大大减少地震位置的误差。目前，该技术正在扩展到更大的数据集，使用分层反演方案，最多可处理10万次地震。这种能力可以解决许多研究问题，包括：最近在断层带发现的地震活动条纹的起源是什么？靠近主要断层的应力状态是什么？当断层带成熟时，对应变局部化有什么限制？关于深度断层上的摩擦随时间变化的性质，我们能了解到什么？地震活动性与地震滑动区和地震滑动区有何关系？

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?