RAPID: Testing the erosion signature of coseismic landslides using cosmogenic catchment wide erosion rates - a case study of the 2016 Kaikoura Earthquake, New Zealand

2016年11月14日，新西兰凯库拉发生7.8级地震，引发了数千次山体滑坡，主要高速公路被封锁，铁路系统基础设施遭到破坏，1000名居民和游客被困在凯库拉海滨小镇。这一事件以及研究者之前在该地区的研究和采样为研究与大地震同时发生的广泛滑坡相关的侵蚀提供了难得的机会。这个快速反应研究（Rapid）项目将使用现代地质技术检查与这些滑坡相关的侵蚀。它将加强美国和新西兰之间的国际合作，并让三名研究生参与科学研究过程。该项目由一位早期职业女性调查员领导。本项目将解决以下与地貌学和地质年代学群落相关的问题：1)同震滑坡对碎屑宇宙成因放射性核素（CRN）衍生的盆地侵蚀速率有何影响？2)凯库拉山脉等构造活跃山带中周期性但广泛存在的同震滑坡对侵蚀物质通量的贡献是什么？首席研究员和她的团队将通过在六个受地震震动的排水系统中重复测量碎屑10Be CRN来解决这些问题。这些样本将用于检查广泛的同震滑坡后整个盆地的侵蚀率。预计滑坡会使盆地侵蚀速率的碎屑CRN测量复杂化。这项研究将通过在大地震（将于2017年1月采样）之前（使用先前收集的样本）和直接在大地震之后限制侵蚀率来规避这一复杂性。

The 14 November 2016 M 7.8 Kaikoura Earthquake in New Zealand triggered thousands of landslides, blocked major highways and destroyed rail system infrastructure, leaving 1000 residents and tourists trapped in the seaside town of Kaikoura. This event and the investigator's previous research and sampling in the region presents a rare opportunity to study erosion associated with widespread landslides that occur at the same time as major earthquakes. This Rapid Response Research (RAPID) project will examine the erosion associated with these landslides using modern geological techniques. It will enhance international collaboration between the US and New Zealand and involve three graduate students in the scientific research process. The project is led by an early career female investigator.This project will address the following questions of relevance to the geomorphology and geochronology communities: 1) What effect does coseismic landsliding have on detrital cosmogenic radionuclide (CRN) derived basin wide erosion rates? and 2) What is the contribution of periodic but widespread coseismic landslides to erosional mass flux in tectonically active mountain belts such as the Kaikoura Ranges? The principal investigator and her team will address these questions by doing repeat detrital 10Be CRN measurements in six drainages shaken by the earthquake. These samples will be used to examine basin-wide erosion rates following extensive coseismic landsliding. Landsliding is predicted to complicate detrital CRN measurements of basin wide erosion rates. This study will circumvent this complication by constraining erosion rates before (with previously collected samples) and directly following a large earthquake (to be sampled this January 2017).