Computational Infrastructure
for Geodynamics (CIG)

Community-driven organization advancing Earth science by providing the infrastructure for the development and dissemination of software for geophysics and related fields.

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Community Survey 

Provide feedback on community priorities. As we gather for the 2025 CIG TNG, this survey will provide important input for discussions.
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CIG - The Next Generation

4-7 August 2025
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Registration is closed. 

Walk up posters spots still available.

Please see the event page for more information on registering and abstract submission.

 

Research Highlight

2025 magnitude 7.7 Mandalay, Burma (Myanmar)

Snapshots of simulated ground motions produced by the 2025 magnitude 7.7 Mandalay, Burma (Myanmar) supershear earthquake. The time relative to the origin time is shown in the bottom left corner of each panel. The seismic wavefield is simulated using the U.S. Geological Survey Finite Fault Model, a regional 3D velocity model (Wang et al., 2019), and SPECFEM3D. The earthquake epicenter is shown as a gray star, the portion of the Sagaing fault (Mandalay, Burma) on which slip is prescribed is shown as a black line. Positive and negative vertical ground motion velocities (cm/s) are colored red and blue, respectively.

Improving seismic hazard estimates with ground-motion simulations

On 28 March 2025, a magnitude 7.7 earthquake occurred near Mandalay, Burma (Myanmar), rupturing over 460 km of the Sagaing fault and reaching supershear rupture speeds exceeding the local shear wave speed at the depth of rupture (USGS Finite Fault Model). Supershear ruptures amplify ground shaking at large distances from the ruptured fault, which are further modified by heterogeneous Earth structure to produce complex patterns of ground shaking across continental scales. Preliminary ground-motion simulations underway at the USGS aim to incorporate a growing body of seismological observations to understand the roles of source, path, and site effects contributing to observed ground shaking during the 2025 Mandalay earthquake, including amplified ground motions felt in Bangkok, Thailand, over 1,000 km away from the earthquake hypocenter. We use the rapidly published USGS finite fault model, ... [full article]

Contributed by 

H.L. Kehoe1, O.S. Boyd1, A.M. Dunham2, E. Bozdağ3,4, M.P. Moschetti1, E.A. Wirth2, and W.J. Stephenson1
1U.S. Geological Survey, Geologic Hazards Science Center, Golden, CO, USA
2U.S. Geological Survey, Earthquake Science Center, Seattle, WA, USA
3Department of Applied Mathematics and Statistics, Colorado School of Mines, Golden, CO, USA
4Department of Geophysics, Colorado School of Mines, Golden, CO, USA

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What Is happening?

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2025 CIG The Next Generation

August 4-7, 2025

Join the geodynamics community to explore the science and computational challenges that underpin our understanding of Earth’s dynamical systems. The goal is to support the next generation of researchers in furthering our understanding of large- and small-scale systems.  •   More Info 

Updated 20 May 2025

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2025-2026 Webinar Series

Fall-Spring 2025/2026

Check back in the Fall  •  More Info 

Updated 20 May 2025

Get the Tools

Calypso

v1.2.0
A set of codes for MHD dynamo simulation in a rotating spherical shell using spherical harmonics expansion methods.
Current release: 2017-07-17
GNU GPL v2 or newer license

Rayleigh

v1.1.0
A 3-D convection code designed for the study of dynamo behavior in spherical shell geometry. 
 
Current release: 2022-05-05
GNU GPL v3 or newer license

SW4

v3.0
3-D seismic modeling, with a free surface condition on the top boundary, absorbing super-grid conditions on the far-field boundaries, and an arbitrary number of point force and/or point moment tensor source terms. 
Current release: 2023-08-30
GNU GPL v2 or newer license

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