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• W2160114728 abstract "Summary. EarthScope will provide the Earth Science c ommunity with a data set with unprecedented spatial resolution, quality, and overall volume. Since many y ears ago there has been a gap between theory and observation particularly in global seismology: the increasing number of excellent broadband recordings contain information which is not routinely used in the imaging process, partly due to limited receiver density, but also because there are no algorithms which allow modelling the complete wavefield in the observed frequency band for global and regional 3D Earth models. Therefore, there are two aspects which - from a seismological point of view - are important t o make EarthScope successful: (1) the data a cquisition part should be accompanied by strong efforts to develop, standardize, and make available 3D modeling and imaging tools with which the vast data volumes can be processed and (2) high-performance computing systems should be dedicated to EarthScope. We will present some results from 3D seismic modelling on supercomputers which indicate that with appropriate data a cquisition configurations s tructural details of f ault zones, subduction zones, etc. may at some point be imaged with resolution not possible with ray-based tomography. 3D Wave Simulation: Local and Regional Scale. Reliable estimation of shaking hazard in seismically active regions necessitates good knowledge of the 3D structure as amplification effects of sedimentary basins strongly depend on lateral gradients of seismic velocities (see Figure 1 for a simulation of an earthquake in the Cologne basin, Germany, where the sediment structure is fairly well known. Reverberations develop in the shallow sediments.). We will soon be able to simulate the frequency band relevant t o engineering seismology (>1 Hz dominant frequency) for local and regional seismicity. Yet, the more we increase the spatial resolution of our simulations, the more difficult it gets to account for r ealistic structures: t he small wavelengths involved will necessitate the dicretization of the near-surface low-velocity structure as well as topography in mountainous regions. This poses great challenges to numerical modelling: it will be important to develop schemes which are practical for models with velocity variations over at least an order of magnitude." @default.
• W2160114728 created "2016-06-24" @default.
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• W2160114728 date "2001-01-01" @default.
• W2160114728 modified "2023-09-27" @default.
• W2160114728 title "Regional to Global 3D Seismic Wave Effects relevant to EarthScope: Site Effects, Fault Zones, Volcanoes, Subduction Zones, Plumes" @default.
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