Improving defence against earthquakes and tsunamis

Tohoku earthquake 2011

A pioneering new computer model has been developed to simulate the whole chain of hazard events triggered by offshore mega subduction earthquakes, by a team involving UCL and Bristol engineers.

It is the first model to do this and has the potential to reduce losses to life and property caused by disasters like the huge earthquake and tsunami that struck Japan six years ago this Saturday (11 March).

The project, called CRUST (Cascading Risk and Uncertainty Assessment of Earthquake Shaking and Tsunami) and funded by the Engineering and Physical Sciences Research Council (EPSRC), involves an international team spearheaded by engineers from the University of Bristol, in collaboration with UCL EPICentre and supported by testing at HR Wallingford.

Designed to be used in any part of the world potentially vulnerable to offshore subduction earthquakes (where one tectonic plate is forced beneath another), such as Japan, New Zealand, the Pacific Northwest (US and Canada), Mexico, Chile and Indonesia, the model integrates every aspect of an undersea earthquake – including tsunamis, aftershocks and landslides – into a single multi-hazard simulation tool.

The CRUST project looks to generate more comprehensive, more accurate maps of all potential hazards stemming from off-shore earthquakes.

Professor Tiziana Rossetto, Co-Investigator on CRUST (UCL Civil, Environmental & Geomatic Engineering), said: “The model gives us a much greater understanding of how events are connected with one other. Knowing this is key to strengthening emergency planning, improving evacuation strategies, enabling engineers to calculate buildings’ resilience more realistically and helping the insurance industry produce more reliable financial risk analyses.”

In the past, hazards posed by earthquakes and by the different threats associated with them have been modelled separately, based on different methods, data and assumptions varying from one part of the world to another. This lack of integration and lack of a standard approach has limited models’ real-world value as well as the benefits of information sharing between countries.

With its ability to produce a more reliable and realistic picture of the entire sequence of hazard events and to generate multi-hazard maps, the model will enable governments, emergency services, the financial industry and others to explore alternative disaster scenarios in detail.

Dr Katsu Goda of the University of Bristol, who has led the CRUST team, said: “The magnitude nine Tōhoku earthquake and resulting tsunami waves that hit the east coast of Japan on 11 March, 2011 caused around 19,000 deaths plus economic damage estimated at $300 billion. We hope our simulation tool will secure wide rollout around the world and will be used to inform decision-making and boost resilience to these frequently devastating events.”

Professor Rossetto added: “The next steps are to integrate within the model novel relationships we are developing for predicting damage to the built environment from the hazards. This will enable better estimates not only of the hazards, but of their consequences.”

Reference:
Shunichi Koshimura et al. The impact of the 2011 Tohoku earthquake tsunami disaster and implications to the reconstruction, Soils and Foundations (2014). DOI: 10.1016/j.sandf.2014.06.002

Note: The above post is reprinted from materials provided by University College London.

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