"Upgrading computational facilities for URI Seismology and Marine Geophysics"

0727919智力功绩。该项目将支持不断扩大的罗德岛大学海洋地震学和地球物理学青年研究人员群体的计算研究。该设施将包括一个100处理器核心、25节点的Linux Beowulf集群，以及相关的30 TB RAID磁盘阵列。这一基础设施的提供最初将促进有限频率地震层析成像的重大进展，这一努力将使该小组能够获得更准确的地球内部结构图像。将应用一种新的实数有限频率波传播理论，并将计算有限频率敏感核，以确定地震数据集中的地震走时和地震幅度异常对三维地球结构变化的敏感程度。使用上述理论发展改进的计算资源和算法的相关实现将使得能够分组解决非线性层析成像问题，而不受当前高频或结构限制。除了当前URI调查组改进的3D层析成像能力外，新加入URI(Savage)的教员依赖高性能的计算集群来计算3D合成地震图，并将这些方法应用于实际问题，如创建加利福尼亚州海湾的地震速度、衰减和各向异性模型(通过NSF边际计划支持)。Savage进一步将利用这个集群继续开发和改进一个广泛使用的多处理器程序(Specfms3D)。赵最近加入了URI小组，在那里他将使用该集群继续研究计算有限频率敏感核的散射积分方法。张将在具有不规则表面、海底地形、各向异性和地震非均质性的集群上生成3D模型。这些新加入的URI组成员都在使用其他机构/国家/地区的机器进行计算，这些机构/国家/地区相当于通过该项目建立的机构/国家。因此，在URI建立这类资源将为团队提供必要的资源来开展其核心研究。计算集群将通过提供具有先进3D图形功能的现代高性能超级计算机来增强URI的研究基础设施。该设施将继续用于研究、本科生和研究生教育。来自波传播和地幔对流的模拟结果将继续被整合到地球物理课程中，以帮助学生获得物理直觉。一门关于计算地球物理学的研究生课程将使用拟议中的设施。该设施对于研究生参与研究项目是必不可少的。

ABSTRACTOCE-0727919Intellectual Merit. The project will support the computational research of an expanding group of University of Rhode Island young investigators in marine seismology and geophysics. The facility will comprise a 100-processor-core, 25 node Linux Beowulf cluster with associated 30 TB RAID disk array. The provision of this infrastructure will initially facilitate significant advances in finite-frequency seismic tomography, an effort that will enable the group to achieve more accurate images of the Earth's interior structure. A new theory of propagation of real, finite-frequency waves will be applied, and finite-frequency sensitivity kernels will be calculated to determine the degree to which seismic traveltime and seismic amplitude anomalies in seismic data sets are sensitive to changes in 3D Earth structure. The improved computational resources and associated implementations of algorithms using the aforementioned theoretical developments will enable to group to solve nonlinear tomographic problems without present-day high frequency or structural limitations. In addition to the improved 3D tomographic imaging capability for the current URI group of investigators, faculty new to URI (Savage) depend on high performance computational clusters to calculate 3D synthetic seismograms, and to apply these methods to practical problems such as the creation of a model of seismic velocity, attenuation and anisotropy of the Gulf of California (supported through the NSF Margins Program). Savage further will use this cluster to continue the development and improvement of a widely-used multi-processor program (Specfem3D). Zhao has recently joined the URI group, where he will use the cluster to continue work on the scattering-integral method for calculating finite-frequency sensitivity kernels. Zhang will generate 3D models on the cluster with irregular surfaces, seafloor topography, anisotropy and seismic heterogeneity. These newly-joined URI group members have all been carrying out their calculations using machines at other institutions/countries equivalent to that to be established through this project. Thus the establishment of this class of resource at URI will provide the team with the necessary resources to carry out their core research.Broader impacts. The computational cluster will enhance URI's research infrastructure by providing a modern, high-performance supercomputer with advanced 3D graphics capabilities. The facility will continue to be used in research and undergraduate and graduate education. Results from simulations of wave propagation and mantle convection will continue to be integrated into geophysical courses to help students to gain physical intuition. A graduate course on computational geophysics will use the proposed facility. The facility is essential for graduate students to participate in research projects.