Collaborative Research: Paleoseismology and Paleogeodesy of the Sumatran Subduction Zone

合作研究：苏门答腊俯冲带的古地震学和古大地测量学

• 批准号: 0207690
• 负责人: Steven Ward
• 金额: $ 9.96万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207690&HistoricalAwards=false
• 关键词: Collaborative; Research; Paleoseismology; Paleogeodesy; Sumatran

EAR-0207690University of California-Santa CruzThis study continues investigations of the paleoseismology and paleogeodesy of the Sumatran subduction zone in order to determine possible regularity of periods between fault ruptures, repeatability of pattern of slip on faults, influence of geologic structure on fault rupture, and variation of seismic/aseismic coupling with time. The centerpiece of the study is the use of coral heads (Porites and other genera) that are sensitive to sea level changes with uncertainties of a few centimeters. Annual growth bands give time-series with relative errors of a few years and U-Th dating of the heads gives dates with errors of a decade. The magnitude of vertical deformation associated with earthquakes (paleoseismology) and deformation in intervals between earthquakes (paleogeodesy) are being determined from these data. Results are being modeled and historical earthquakes (seismograms from a variety of sources) are being used to determine if segment boundaries influenced dimensions of historical ruptures. The specific goals of this project are to: (1) better characterize source parameters of 1681, 1797, and 1833 events; (2) determine southern limit of these events; (3) extend record back to 14th century; (4) determine source characteristics of 1861 and 1907 quakes; (5) model historical seismograms of large quakes on Sumatran fault; (6) characterize aseismic strain events in 1861, 1797, and 1833 regions.

EAR-0207690加州大学圣克鲁斯分校这项研究继续对苏门答腊俯冲带的古地震学和古大地测量学进行调查，以确定断层破裂之间周期的可能规律性、断层上滑动模式的重复性、地质结构对断层破裂的影响，以及地震/抗震耦合随时间的变化。该研究的核心是使用珊瑚头（滨珊瑚和其他属），它们对海平面变化敏感，不确定性为几厘米。年生长带给出的时间序列具有几年的相对误差，而头部的 U-Th 测年给出了具有十年误差的日期。与地震相关的垂直变形的大小（古地震学）和地震间隔内的变形（古地球测量学）是根据这些数据确定的。正在对结果进行建模，并使用历史地震（来自各种来源的地震图）来确定段边界是否影响历史破裂的尺寸。该项目的具体目标是：（1）更好地表征1681、1797和1833事件的源参数； (2) 确定这些事件的南界； (3) 将记录追溯到14世纪； (4)确定1861年和1907年地震的震源特征； (5)苏门答腊断层大地震的模型历史地震图； (6) 描述 1861 年、1797 年和 1833 年地区地震应变事件的特征。