The Cause of the Damage Pattern Resulting from the Whittier Narrows Earthquake of October 1, 1987

1987 年 10 月 1 日惠蒂尔海峡地震造成损害的原因

• 批准号: 8803934
• 负责人: Keiiti Aki
• 金额: $ 4.25万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-04-01 至 1989-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803934&HistoricalAwards=false
• 关键词: Cause; Damage; Pattern; Resulting; Whittier

This research project addresses the cause of the spatial distribution of strong ground motion resulting from the Whittier Narrows earthquake of October 1, 1987. The pattern of damage caused by this earthquake is unusual. The area of most severe damage is at a distance of eight to nine kilometers from the epicenter. It occurred as a "semi-ring of damage" since little or no severe damage was observed to the east of the epicenter. Specifically, this project is examining an hypothesis that the very localized damage pattern observed may be due to the effect of the free surface on horizontally polarized shear waves (SV) incident at the critical angle. Preliminary investigation of this hypothesis is strongly suggestive that is can explain the observed damage pattern. This information has the potential to contribute to the understanding and prediction of earthquake damage, in particular the damage to constructed facilities.

这项研究项目解决了1987年10月1日惠蒂尔窄带地震引起的强地面运动空间分布的原因。这次地震造成的破坏模式是不寻常的。受损最严重的地区距离震中8至9公里。由于在震中以东观察到很少或没有严重的破坏，它以“半环破坏”的形式发生。具体地说，这个项目正在检验一个假设，即观察到的非常局部化的损伤模式可能是由于自由表面对以临界角度入射的水平极化剪切波(SV)的影响。对这一假说的初步研究强烈表明，它可以解释观察到的损伤模式。这些信息有可能有助于了解和预测地震破坏，特别是对已建设施的破坏。