【大学频道】中国科大赵九章·侯德封大师讲堂 | 加州大学Santa Cruz分校Thorne Lay教授

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图 | Thorne Lay

题   目：全球大地震频发及人类对大地震的认识

报告人：Thorne Lay

单   位：University of California, Santa Cruz

时   间：2015-05-20

地   点：中国科学技术大学

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报告摘要

Thorne Lay教授在报告中指出，2004-2014年，全球共发生了18次震级大于8级的超大地震，平均每年1.8次，是1900-2004年间超大地震频率的2.65倍。过去的十多年恰好也是国际地震台网、GPS台网、海啸观测仪、卫星影像测量等一系列观测手段和技术快速发展的阶段，这为我们认识大地震的前兆、破裂过程以及震后过程提供了前所未有的资料，为人类认识大地震物理过程的多样性和复杂性提供了多种综合分析手段，使得我们在定量认识震源物理问题取得了重要的进展。Thorne Lay教授通过翔实的数据，丰富的实例，细致的对比和总结，让在场师生们对现今大地震研究进展和前沿研究领域有了深刻的认识。

个人简介

Thorne Lay's primary research interests involve analysis of seismic waves to interrogate the deep structure of the Earth's interior and to study the physics of earthquake faulting. In the realm of deep Earth structure, the focus is on imaging structures associated with internal dynamics of the mantle, particularly the core-mantle boundary region and the vicinity of subducting lithosphere. Studies of the core-mantle boundary have revealed a complex seismic structure believed to involve a thermal and chemical boundary layer at this, the largest internal compositional contrast within the planet. One of the major questions about subducting lithosphere that is being addressed is the depth extent to which the subducting material penetrates, which is closely linked to the debate about layered mantle versus whole mantle convection. Other Earth structure interests include the lateral variations of lithospheric structure, which are studied using body waves and surface waves, and the nature of regional waves propagating in the crust.
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