Collaborative Research: Bridging the gap between long- and short- wavelength structure in the mantle

地球的图像？地球的内部主要是由两种技术产生的，这些技术在分辨率的两端提供地球的快照。层析成像提供了地球的全地幔视图。S大尺度（2000-5000 km）地震速度异常；(2)波形建模提供了特定地理位置的小尺度（~100-500 km）视图。由于这些成像技术所解决的特征的尺度长度以一个数量级变化，因此将这些不同的图像调和成一个单一的地球模型仍然具有挑战性。室内。本项目旨在通过以下方法调和这些图像中观察到的差异：(1)分析Earthscope在北美记录的新地震数据？s可移动阵列（TA）和FlexArray部署，ANSS骨干站，加拿大国家地震台站，以及最近的PASSCAL部署；(2)利用PSVaxi软件，利用全波形建模技术对全球和区域尺度模型进行分析。主要目标是评估全球和区域尺度地震模型的准确性，并破译深地幔复杂结构在所有空间尺度上如何影响宽带地震波形。深层地幔结构的地震学模拟对于理解地球内部发生的动力学过程至关重要。该项目将进一步开发能够在全球范围内模拟地震运动的软件。最终，这将有助于阐明地球？通过对模拟波形与新记录数据的比较，得到了S内部结构。他们将测试先前导出的地球模型的有效性，评估深部地幔的结构特征如何影响地震波形。最终，这将为社区提供有价值的波形传播工具和对地震模型和图像准确性的严格评估。

Images of the Earth?s interior are primarily produced by two types of techniques providing snapshots of the Earth at two end-members of resolution. (1) Tomographic imaging provides a whole-mantle view of Earth?s large-scale ( 2000-5000 km) seismic velocity anomalies; (2) Waveform modeling provides a small-scale (~100-500 km) view for specific geographic locations. Because the scale length of features resolved in these imaging techniques varies by an order of magnitude it remains challenging to reconcile these different pictures into one single model of the Earth?s interior. This project aims to reconcile the disparities observed in these images by: (1) Analyzing new seismic data recorded in North America from Earthscope?s Transportable Array (TA) and FlexArray deployments, ANSS Backbone stations, Canadian National Seismic Network Stations, and recent PASSCAL deployments; (2) Analyzing global- and regional-scale models previously introduced to the community by full waveform modeling techniques using the PSVaxi software. The primary goals are to assess the accuracy of the global and regional scale seismic models, and to decipher how complex structures in the deep mantle at all spatial scales affect broadband seismic waveforms.Seismological modeling of deep mantle structure is crucial in understanding the dynamic processes taking place within the Earth. This project will further develop software that is capable of simulating earthquake motions on the global scale. Ultimately this will aid in elucidating the Earth?s interior structure by comparing the simulated waveforms with the newly recorded data. They will test the validity of previously derived Earth models, assessing how structural features in the deep mantle affect the seismic waveforms. Ultimately, this will provide valuable waveform propagation tools and a rigorous assessment of the accuracy of seismic models and images to the community.