Source Parameters Variations Among Oceanic Earthquakes and Tectonic Implications

大洋地震震源参数变化及构造意义

• 批准号: 9219302
• 负责人: Seth Stein
• 金额: $ 4.82万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-15 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219302&HistoricalAwards=false
• 关键词: Source; Parameters; Variations; Among; Oceanic

This research deals with the investigation of relative strengths of oceanic crust at ridges and transforms relative to the remaining oceanic lithosphere by means of seismologically-determined stress drops from earthquakes. Preliminary results show several interesting differences in the relative body and surface wave magnitudes, seismic moments, and source time functions. These data suggest that with respect to intraplate events, ridge earthquakes are generally "fast" (releasing energy preferentially at short periods) whereas transform earthquakes are generally "slow" (releasing energy preferentially at long periods). Using seismic source models, the investigators have found that these differences are consistent with ridge events having higher stress drops than transform events, which implies a higher strength of the relatively thin crust at ridges. This research seeks to expand the data set, continue and refine the seismological analysis, and explore the tectonic implications.

本研究主要探讨相对优势的研究 洋脊处的洋壳， 海洋岩石圈地震应力测定 从地震中跌落。 初步结果显示， 体波和表面波的相对差异 震级、地震矩和震源时间函数。 这些数据 这表明，对于板内事件，脊地震 通常是“快速”的（在短时间内优先释放能量 而转换型地震一般是“慢”的。 （在长时间内优先释放能量）。 利用地震 研究人员发现，这些差异 与脊事件相一致， 转换事件，这意味着相对较高的强度 在山脊处有薄壳。 这项研究试图扩大数据集， 继续和完善地震学分析，并探索 构造意义