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: 0207686
• 负责人: Richard Edwards
• 金额: $ 12.71万
• 依托单位: University of Minnesota-Twin Cities
• 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=0207686&HistoricalAwards=false
• 关键词: Collaborative; Research; Paleoseismology; Paleogeodesy; Sumatran

EAR-0207686R. Lawrence EdwardsThis 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-0207686R。劳伦斯·爱德华兹（Lawrence Edwards）这项研究继续研究苏门答腊俯冲带的古理学和古地理区域，以确定断层破裂之间的周期，滑移模式对断层的重复性，地质结构对断层破裂的影响以及与时间的变化的变化。该研究的核心是使用珊瑚头（Porites和其他属），它们对海平面的变化敏感，几厘米的不确定性。年度增长带的相对误差为几年，而u-the the Heads的时间序列有十年的误差。从这些数据中确定了与地震（古杂志）之间地震（古杂志）之间的间隔相关的垂直变形的大小和间隔的变形。正在建模结果，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了历史破裂的维度。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）确定这些事件的南部限制； （3）将记录扩展到14世纪； （4）确定1861年和1907年地震的来源特征； （5）模型在苏门答腊断层上大地震的历史地震图； （6）表征1861年，1797年和1833年的无性菌株事件。