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7.8级地震引发数千起山体滑坡，堵塞主要高速公路，摧毁铁路系统基础设施，导致1000名居民和游客被困在海滨小镇凯库拉。这一事件和调查者之前在该地区的研究和取样为研究与大地震同时发生的大范围山体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学技术研究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。该项目由一位职业生涯较早的女性研究人员领导。该项目将解决与地貌学和地质年代学社区有关的下列问题：1)同震滑坡对碎屑类宇宙成因放射性核素(CRN)得出的盆地范围侵蚀率有什么影响？2)周期性但广泛的同震滑坡对凯库拉山脉等构造活跃山带的侵蚀质量流有何贡献？首席研究员和她的团队将通过在六个受到地震影响的水系中重复进行碎屑10Be CRN测量来解决这些问题。这些样本将被用来检查大规模同震滑坡后整个盆地的侵蚀率。据预测，滑坡将使整个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之前(与之前收集的样本)和紧接在大地震之后(将于2017年1月采样)限制侵蚀速率来绕过这一复杂情况。

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).