Persistent Segmentation, Stress Triggering and Energy Management of the Sumatran Subduction Zone

在2007年由OCE资助的一项研究中，PI收集了岩心、水深和CHIRP地震数据，以建立苏门答腊-安达曼俯冲带的长期时空古地震活动记录。目前的延续请求将允许PI获得更多的辐射测量数据，进一步分析岩心以及地震、浊积岩、海上和陆上数据的相关性。目的是测试分段边界的持久性，聚类行为的重要性，以及当前陆上-海上古地震数据所显示的长期能量模式或“超级旋回”的证据。这一阶段的研究还将研究苏门答腊多段俯冲带的基本重复模型、分段、段间应力触发和长期能量管理。时间序列分析将通过额外的180个14-C数据、CT、ITRAX、x射线和XRF以及高分辨率地震剖面分析进行扩展和完善。将对每一段的时间序列进行建模，以评估断层的能量状态，平衡过去7天记录中的应变积累与应变释放。更广泛的影响包括对这项工作的强烈地震危险成分，这可能导致更精细和可信的浊积岩方法来研究古地震活动性。国际合作也很强大——俄勒冈州立大学的一名印度尼西亚研究生参与其中，并与来自印度尼西亚的科学家、南安普敦国家海洋学中心、日本地质调查局和新加坡地球观测站合作。该项目还包括俄勒冈州立大学博士生最后一年半的学习。

On a previously OCE funded study in 2007 the PI collected cores, bathymetric and CHIRP seismic data to develop a long-term spatial and temporal paleoseismicity record of the Sumatran-Andaman subduction zone. Current continuation request will allow the PI to obtain more radiometric dates, further analyses of the cores and correlation of the seismic, turbidite, and offshore and onshore data. The objectives are to test for the persistence of segment boundaries, the significance of clustering behavior, and the evidence for long-term energy patterns or "supercycles" suggested by current onshore-offshore paleoseismic data. This phase of the study will also address fundamental recurrence model, segmentation, inter-segment stress triggering and long-term energy management of the multi-segment Sumatran subduction zone. Time-series analysis will be extended and refined with additional 180 14-C dates, CT, ITRAX, X-ray and XRF and high-resolution seismic profile analyses. The time series for each segment will be modeled to assess the energy state of the fault, balancing strain accumulation vs. strain release over the last 7ky record.Broader impacts include a strong seismic hazard component to this work that could lead to a more refined and credible turbidite methodology for the study of paleoseismicity. International collaborations are also strong - involving a graduate student from Indonesia at OSU and collaboration with scientists from Indonesia, and with the National Oceanography Centre, Southampton, the Geological Survey of Japan and the Earth Observatory of Singapore. The project also includes the final 1.5 years of a PhD student at OSU.