应我校陆内火山与地震教育部重点实验室，地球物理与信息技术学院李红谊教授和李志伟教授的邀请，美国科罗拉多大学博尔德分校钟时杰教授来我校学术交流并作报告。

题目：Inferring Earth's mantle viscosity from dynamic processes of different timescales:from mantle convection to Late Quaternary sea level change and to ongoing icemelting-induced crustal deformation in West Antarctica

时间：2026年5月20日（星期三）15:00–18:00 

地点：教五楼227

报告人简介：钟时杰，美国科罗拉多大学博尔德分校教授，1985年获中国科学技术大学学士学位，1988年获中国科学院地球物理研究所硕士学位，1994年获美国密歇根大学博士学位，先后在麻省理工学院、加州理工学院等顶尖机构从事研究工作。他的研究主要包括地幔对流与行星尺度构造演化、冰川及沉积载荷引发的地球黏弹性变形、以及高性能计算应用。美国地球物理联合会（AGU）会士。已发表130多篇期刊论文，包括多篇发表在《Nature》, 《Science》,《Nature Geoscience》,《Geophysical Research Letters》等顶级期刊。代表性工作涉及地幔结构动力学、板块俯冲过程、月球潮汐层析成像及黏弹性模拟软件开发等，对理解地球与行星内部过程及长期构造演化做出了重要贡献。

报告内容：About 300 years ago, fishermen in Sweden were concerned with the falling sealevel, and Anders Celsius, an astronomer, best known for his temperature scale today, wassent to search for the cause. Celsius was able to determine the rate of the falling sea levelusing seal rocks but provided no explanation for the falling sea. It was 100 years before thediscovery of ice ages. In 1860's, physicist Lord Kelvin, also known for his temperature scaleamong many other things, provided one of the first scientific determinations of the age ofthe Earth at ~24 million years by considering conductive cooling of the Earth. However,Kelvin made an incorrect assumption by ignoring convective heat transfer in the Earth'smantle that could happen with a finite mantle viscosity, leading to his underestimate of theage of the Earth. Deglaciation in Fennoscandia in late Quaternary above the mantle with ahigh but finite viscosity, causes the land uplift or sea level fall in Sweden since Holocenethat Celsius hoped to explain. In fact, Haskel in 1935 gave the first determination of Earth'smantle viscosity using sea level data in Fennoscandia. Now, it has been demonstrated thatmantle viscosity has the first order control not only for thermal and dynamic evolution ofthe Earth and plate tectonics and supercontinent cycle processes on billions of yearstimescales but also for Earth's crustal motions and sea level change in response to(de)glaciation on decadal to millennium timescales. This presentation will discuss howmantle viscosity can be inferred by studying observations and dynamic processes ondifferent timescales from mantle convection to changes in sea level, gravity, and crustalmotions associated with ongoing and past deglaciation.

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