固体地球物理学术报告通知-叶玲玲

报告地点:教学行政楼706(线上:腾讯会议 234 929 099)

报告时间:2021-10-08 从 15:00 到 17:00

报告人:叶玲玲

报告人简介:

南方科技大学地球与空间科学系副教授。2008年本科毕业于中国科学技术大学,2011年在中国科学院地质与地球物理研究所取得硕士学位,2015年获加州大学圣克鲁斯分校博士学位,随后在加州理工学院地震学实验室进行博士后研究, 2017年底回国在中山大学地球科学与工程学院任教, 2021年3月加入南方科技大学。主要研究全球大地震破裂过程和震源物理,地球深部结构,及利用地震学方法研究火山、滑坡和海啸等自然灾害的机理和预警机制, 2011年至今在Science、Science Advances、EPSL、JGR-Solid Earth和GRL等国际前沿杂志发表相关研究论文50余篇。2018年获得美国地球物理协会Keiiti Aki青年地震学家奖,2021年起担任JGR-solid earth和The Seismic Record的副编辑(Associate Editor).

报告题目:The 2018 Anak Krakatau Volcanic Eruption – Landslide – Tsunami

报告内容简介

On 22 December 2018, a devastating tsunami struck Sunda Strait, Indonesia without warning, leaving 437 dead and thousands injured along the western Java and southern Sumatra coastlines. Synthetic aperture radar and broadband seismic observations demonstrate that a small, <~0.2 km3 landslide on the southwestern flank of the actively erupting volcano Anak Krakatau generated the tsunami. The landslide did not produce strong short-period seismic waves; thus, precursory ground shaking did not provide a tsunami warning. The source of long-period ground motions during the landslide can be represented as a 12° upward-dipping single-force directed northeastward, with peak magnitude of ~6.1×1011 N and quasi-sinusoidal time duration of ~70 s. Rapid quantification of a landslide source process by long-period seismic wave inversions for moment-tensor and single-force parameterizations using regional seismic data available within ~8 min can provide a basis for future fast tsunami warnings, as is also the case for tsunami earthquakes.