A 14.6 billion degrees of freedom, 5 teraflops, 2.5 terabyte earthquake simulation on the Earth Simulator

Komatitsch, Dimitri; Tsuboi, Seiji; Ji, Chen; Tromp, Jeroen

doi:10.1145/1048935.1050155

Cited by 95 publications

(75 citation statements)

References 12 publications

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“…The "spectral element method" (Komatitsch 1997;Komatitsch and Tromp 2002a,b) for example allows very accurate modeling of elastic waves in three-dimensional model structures of the Earth's interior, additionally incorporating various effects, such as topography/bathymetry, anelasticity, anisotropy, ocean loading and rotation as well as gravitation of the Earth. The method proved to give very good results in terms of fit to observed data when using current 3D tomographic earth models (Komatitsch et al 2003;Igel et al 2005b;Schuberth et al 2005). For this study, we used a modified version of the spectral element program SPECFEM3D, in which we implemented the calculation and output of rotational ground motions for comparison with the ring laser data from Wettzell, Germany.…”

Section: Ring Laser Observation Of Rotational Motions Comparison Witmentioning

confidence: 99%

Rotational Motions in Seismology: Theory, Observation, Simulation

Cochard

Igel

Schuberth

et al.

Earthquake Source Asymmetry, Structural Media and Rotation Effects

100

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Section: Ring Laser Observation Of Rotational Motions Comparison Witmentioning

confidence: 99%

Rotational Motions in Seismology: Theory, Observation, Simulation

Cochard

Igel

Schuberth

et al.

Earthquake Source Asymmetry, Structural Media and Rotation Effects

100

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“…Simulations of an earthquake from the year 1855 with four billions unknowns on 1024 processors are analyzed. In [16,17], simulations of seismic wave propagation are reported at the scale of the full Earth. The SEM is implemented on the Earth Simulator supercomputer or on the Marenostrum supercomputer in Spain on respectively 1944 processors and 2166 processor cores.…”

Section: Related Workmentioning

confidence: 99%

High-performance finite-element simulations of seismic wave propagation in three-dimensional nonlinear inelastic geological media

et al. 2010

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We present finite-element numerical simulations of seismic wave propagation in non linear inelastic geological media. We demonstrate the feasibility of large scale modeling based on an implicit numerical scheme and a nonlinear constitutive model. We illustrate our methodology with an application to regional scale modeling in the French Riviera, which is prone to earthquakes. The PaStiX direct solver is used to handle large matrix numerical factorizations based on hybrid parallelism to reduce memory overhead. A specific methodology is introduced for the parallel assembly in the context of soil nonlinearity. We analyse the scaling of the parallel algorithms on large-scale configurations and we discuss the physical results.

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“…These simulations provide a mean to better understand the earthquake, however, it is also important to verify simulation results with field-collected seismic data. Komatitsch et al [7] conducted a global-scale simulation of seismic wave propagation and superimposed the simulation data over field-measured waveforms data.…”

Section: Visualization Of Simulation Seismic Datamentioning

confidence: 99%

Visualizing field-measured seismic data

Hsieh

Chen

2010

2010 IEEE Pacific Visualization Symposium (PacificVis)

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This paper presents visualization of field-measured, time-varying multidimensional earthquake accelerograph readings. Direct volume rendering is used to depict the space-time relationships of seismic readings collected from sensor stations in an intuitive way such that the progress of seismic wave propagation of an earthquake event can be directly observed. The resulting visualization reveals the sequence of seismic wave initiation, propagation, attenuation over time, and energy releasing events. We provide a case study on the magnitude scale M w 7.6 Chi-Chi earthquake in Taiwan, which is the most thoroughly recorded earthquake event ever in the history. More than 400 stations recorded this event, and the readings from this event increased global strong-motion records five folds. Each station measured east-west, north-south, and vertical component of acceleration for approximately 90 seconds. The sensor network released the initial raw data within minutes after the ChiChi mainshock. It is essential to have a visualization system for fast data exploring and analyzing, offering crucial visual analytical information for scientists to make quick judgments. Raw data requires preprocessing before it can be rendered. We generated a sequence of ground-motion wave-field maps of 350 × 200 regular grid covers the entire Taiwan island from the sensor network readings. The result is a total of 1000 ground-motion wave-field maps with 0.1 second interval, forming a 1000 × 350 × 200 volume data set. We show that visualizing the time-varying component of the data spatially uncovers the changing features hidden in the data.

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A 14.6 billion degrees of freedom, 5 teraflops, 2.5 terabyte earthquake simulation on the Earth Simulator

Cited by 95 publications

References 12 publications

Rotational Motions in Seismology: Theory, Observation, Simulation

Rotational Motions in Seismology: Theory, Observation, Simulation

High-performance finite-element simulations of seismic wave propagation in three-dimensional nonlinear inelastic geological media

Visualizing field-measured seismic data

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