NGA-gm.org: An Online Hub for Earthquake Ground Motion Data, Models, and Online Tools

Next Generation Attenuation (NGA) has been a series of earthquake ground motion initiatives started in October 2003 to develop databases and models for shallow crustal earthquakes ( NGA-West3, NGA-West2, NGA-West ), subduction earthquakes ( NGA-Subduction ), and stable continental earthquakes in Central and Eastern North America ( NGA-East ). The NGA databases contain metadata, various intensity measures, and processed (“corrected’) time series. Furthermore, the NGA projects also provide tools for ground motion models (GMMs) and for selecting and scaling ground motion time series for research and engineering applications. As of 2025, the NGA databases and interactive online tools spread across multiple websites and platforms, and with varying levels of functionality. The goal of NGA-gm hub is to bring various NGA projects under the same umbrella. NGA-gm provides users with a one-stop-shop to find ground motion data and metadata, as well as tools to interface to interact with the data and GMMs. The NGA-gm hub will be developed step by step, and we start with the latest NGA-West3 database.

Databases & Tools

The NGA-gm project is coordinated by a Steering Committee consisting of Yousef Bozorgnia, Norman Abrahamson, Scott Brandenberg and Albert Kottke.

Development of the NGA-gm hub is made possible by a generous financial donation from Computers & Structures, Inc. (CSI) and intellectual support of the University of California Office of President.

Over the last couple of decades, numerous junior and senior researchers and practicing professionals have supported the development of the NGA programs. Their dedication is gratefully acknowledged. Main financial supporters have been the California Department of Transportation (Caltrans) and Pacific Gas & Electric Company (PG&E). Numerous other institutions have also provided financial resources. The support and encouragement of all individuals and organizations are greatly appreciated.

Licensing Agreement

Individuals and organizations who use any portion(s) of the databases and tools agree with the terms and conditions of using the data, tools and models.