Global Earthquake Model (GEM)

For a world that is resilient to earthquakes

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Global Earthquake Model (GEM)

The Global Earthquake Model (GEM) Foundation was established to create an independent, uniform, and openly accessible standard for calculating and communicating seismic risk worldwide and for developing much-needed tools and software such as OpenQuake, earthquake hazard and risk models, and associated databases for reliable and transparent seismic risk assessment globally.

Formed in 2009 as a nonprofit organization in Pavia, Italy, GEM is comprised of an international community of scientists and professionals, supported by a public-private sponsorship with a vision to create a world that is resilient to earthquakes.

GEM Models

MODEL LOCATION PERIL STATUS
The GEM Colombia model is based upon GEM’s regional model for South America first developed from 2013 to 2015 within the South America Risk Assessment (SARA) project funded by the Swiss Re Foundation and updated in 2018. The development process involved dozens of local scientists and engineers from earthquake-prone countries in South America, resulting in an open product for analyzing ground-up loss from ground shaking for residential, commercial, and industrial buildings. This model has been further improved with local information, such as local construction practices, replacement costs and level of enforcement of the seismic regulations. Colombia Earthquake Available
GEM’s South Africa earthquake risk model was generated using the hazard model for South Africa developed by the South Africa Council for Geoscience as the national hazard model, and for input to South Africa building design regulations. The vulnerability and exposure models and data were developed by GEM and cover the residential, commercial and industrial building stock. The risk model may be used to assess potential financial losses to commercial, industrial and residential buildings due to earthquake ground shaking. South Africa Earthquake Available
The China model has been developed by GEM using public sources of past seismicity, geodesy and geology, exposure and vulnerability information. The hazard component incorporates both faults and area sources. Earthquake occurrence rates on active faults are based on a new tectonic block model derived from the joint inversion of geodetic and geologic data. The risk model provides estimates of risk to residential, commercial and industrial buildings using GEM’s vulnerability models appropriate to Chinese construction practice. GEM has also developed an exposure model that can be used to estimate total losses to the building stock in addition to portfolio losses. GEM extensively collaborated with its private and public partners to test and validate the model against industry standards in order to produce a new model that represents GEM’s view of risk. China Earthquake Available

About GEM Models and Products

To improve earthquake resilience, GEM offers collaborative services, products and resources that can be used for public and commercial purposes by organizations or individuals worldwide. GEM's products and services are transparent, accessible, credible and applicable not only for disaster prevention and preparedness, but also for applications that focus on response and recovery.

Open and free distribution of data, models and tools will continue to be at the core of GEM’s work, and will further strengthen its efforts to broaden their availability and accessibility.

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