An SH- and P-wave Reflection Study of the Sikeston Ridge in the Central New Madrid Seismic Zone

新马德里中部地震区赛克斯顿海脊的 SH 波和 P 波反射研究

• 批准号: 9725776
• 负责人: Ronald Street
• 金额: $ 10.45万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-15 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725776&HistoricalAwards=false
• 关键词: SH; wave; Reflection; Study; Sikeston

9725776 Street This research involves the use of high-resolution seismic reflection profiling to determine if the southern end of the Sikeston Ridge in the New Madrid seismic zone of southeastern Missouri is a tectonic or an erosional feature; and, if it is a tectonic feature, to determine if the eastern edge of the Sikeston ridge is linked to the Reelfoot Scarp in northwestern Tennessee. Evidence of recent fault movement will be sought in a basal Quaternary gravel unit that occurs throughout the area at a depth of 40 to 60 m. Areas of possible faulting will be further investigated with high-resolution P-wave seismic reflection profiling to trace deformation to Paleozoic bedrock near 550 m depth. Given the close association of the Sikeston ridge with the most active segment of the New Madrid seismic zone and Lake County Uplift, it is important that the origin of the ridge and its association with other tectonic features in the area be ascertained in order to fully understand the potential earthquake activity in the area. This research is a component of the National Earthquake Hazard Reduction Program. ***

邮编：9725776 这项研究涉及到使用高分辨率地震反射剖面，以确定是否南端的塞克斯顿脊在新马德里地震带的密苏里州东南部是一个构造或侵蚀功能，如果它是一个构造功能，以确定是否东部边缘的塞克斯顿脊连接到Reelfoot陡崖在田纳西州西北部。 近期断层运动的证据将在整个区域40至60米深度的第四纪砾石基底中寻找。 将利用高分辨率P波地震反射剖面法进一步调查可能存在断层的区域，以追踪近550米深处古生代基岩的变形情况。 鉴于塞克斯顿脊与新马德里地震带和莱克县地震带最活跃的部分有着密切的联系，为了充分了解该地区潜在的地震活动，必须查明该脊的起源及其与该地区其他构造特征的联系。 这项研究是国家地震减灾计划的一个组成部分。 ***