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: 9903301
• 负责人: Kerry Sieh
• 金额: $ 43.01万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903301&HistoricalAwards=false
• 关键词: Collaborative; Research; Paleoseismology; Paleogeodesy; Sumatran

9903301 SiehPrevious work has demonstrated that coral "microatolls" offer an unrivalled opportunity to test models of earthquake recurrence, because they record vertical deformation through several large-earthquake cycles quite precisely in their morphology and annual banding. Between the western coast of Sumatra and the trench of the Sumatran subduction zone, several collected slabs of head corals record sea-level changes caused vertical interseismic and coseismic deformation. On the islands of the outer-arc ridge, work has documented sudden emergence of 1-2 meters during the giant earthquake of 1833, and corals uplifted similar amounts during two earlier events about AD 1608 and 1380 suggest such events might recur about every 230 years. In periods between these large emergence events, coral heads record rapid submergence within 130 km of the trench, rapid emergence between 130 and 200 km of the trench, and near-stability on the mainland coast, about 240 km from the trench, and this pattern may be consistent with interseismic strain accumulation models. This proposal will continue the investigation of the Sumatran subduction zone, studying the giant 1833 event and its predecessors using coral stratigraphy, morphology, and geochronology.

先前的研究表明，珊瑚“微环礁”为测试地震复发模型提供了无与伦比的机会，因为它们在形态和年带状上相当精确地记录了几次大地震周期的垂直变形。在苏门答腊西海岸和苏门答腊俯冲带海沟之间，几块收集到的头珊瑚板块记录了海平面变化导致的垂直震间和同震变形。在外弧脊的岛屿上，工作记录了1833年大地震期间突然出现1-2米的高度，而在公元1608年和1380年的两次地震中，珊瑚上升了类似的高度，这表明这样的事件可能每230年发生一次。在这些大型涌现事件之间的时期，珊瑚头在距海沟130 km范围内记录了快速淹没，在距海沟130 ~ 200 km范围内记录了快速涌现，在距海沟约240 km的大陆海岸记录了接近稳定，这种模式可能与地震间应变积累模式一致。本提案将继续对苏门答腊俯冲带进行调查，利用珊瑚地层学、形态学和地质年代学研究1833年的巨大事件及其前身。