Paleomagnetic Constraints on Late Quaternary Crustal Fragmentation in the Area of the 1994 Northridge Earthquake

1994年北岭地震地区晚第四纪地壳破碎的古地磁约束

• 批准号: 9416324
• 负责人: Shaul Levi
• 金额: $ 5.5万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416324&HistoricalAwards=false
• 关键词: Paleomagnetic; Constraints; Late; Quaternary; Crustal

9416324 Levi This study will examine the paleomagnetism of continentally-derived, late Quaternary, Saugus Formation sedimentary rocks in the San Fernando Valley and east Ventura Basin in order to delineate the boundaries of rotated crustal blocks. Preliminary work has roughly delineated the boundaries of rotated versus non-rotated blocks in the area, and has shown that crustal segmentation and vertical axis rotations continue to the present. This work will define the block boundaries more precisely and relate them to mapped faults or other tectonic features. The results will enable more precise determination of the strike-slip versus dip-slip components of movement in response to the tectonic stresses and may provide a practical limit on thrust-fault earthquake magnitudes in the Los Angeles Basin area.

9416324本研究将研究圣费尔南多河谷和东部文图拉盆地晚第四纪陆源索格斯组沉积岩的古地磁，以圈定旋转地壳块体的边界。初步工作已大致划定了区域内旋转区块和非旋转区块的边界，并表明地壳分割和垂直轴旋转至今仍在继续。这项工作将更准确地定义区块边界，并将它们与绘制的断层或其他构造特征联系起来。这一结果将能够更准确地确定走滑和倾滑运动分量对构造应力的响应，并可能为洛杉矶盆地地区的逆冲断层地震震级提供一个实用的界限。