Misfit Criteria for Quantitative Comparison of Seismograms

Abstract

or semianalytical solutions. A set of testing examples is included, together with their thorough descriptions and reference solu­ tions, allowing participants to fully replicate the model with their own code. Reference solutions can be downloaded for compari­ son purposes. Alternatively, the simulation result then can be uploaded to the server, which will calculate and display the time-frequency misfits between selected solu­ tions (Kristekova et al. [2006]; see also the SPICE code library). The source-imaging benchmark is a blind test on kinematic source inversion. A syn­ thetic data set for a hypothetical source model (based on the 2000 Tottori earthquake in Japan) is provided for a set of receivers. Participants can download this data set, try to invert for the slip distribution, and compare the result with the correct one that was used to obtain the benchmarking database. Outlook We hope the library helps researchers get started in using computational tools in seis­ mology. The next step is to develop a more sophisticated infrastructure that facilitates the implementation and execution of large simulations on a routine basis. At a joint meeting of SPICE and CIG (Com­ putational Infrastructure in Geodynamics, a U.S. project providing community codes for geodynamics; Web site: http://www .geodynamics.org) held 8-12 October 2007 in Jackson, N. H., participants discussed how to facilitate the use of computational methods in seismology, and they indicated the need to coordinate developments (e.g., benchmarking, on-demand computing, model and data exchange formats, and train­ ing) on an international scale. To meet this need, it was decided to initiate a new Inter­ net platform (http://www.computational-seismology.org) and an associated mailing list, through which information on meetings, recent developments, publications, projects, and new software in the field of computa­ tional seismology can be disseminated.

3D Viscoelastic Anisotropic Seismic Modeling with High-Order Mimetic Finite Differences

“…We perform a time-frequency analysis of the elastic and viscoelastic solutions using the definitions of Kristekova Phase and envelope misfits for the homogeneous case and for a randomly chosen receiver in the 3D heterogeneous case et al [12]. This allows us to completely separate phase misfits from envelope misfits.…”

Regional wave propagation using the discontinuous Galerkin method

“…Ground displacements calculated by SpecFEM are differentiated in time to compare them to the velocity output of SeisSol. With respect to the results of the SE method, a seismogram difference can be quantified by the time-frequency misfit analysis introduced by Kristekova et al (2006). Here, the signals are decomposed in the time-frequency plane to characterize the difference by separation of phase and envelope misfits.…”

Seismic Structural Response Analysis Considering Fault-Structure System: Application to Nuclear Power Plant Structures

“…Quantitative comparison of misfits is also provided in Table 4. Envelope and phase misfits are checked based on misfit criteria, 8) which accounts for wavelength time and fre-quency information. The obtained envelope and phase misfit values are less than 5% and 1%, respectively; these results verify the accuracy of the simulation tool for application to fault-structure system analysis.…”