断层源模型显示沿整个断裂带宽度测量的滑动率最能代表观测到的厄瓜多尔帕拉坦加-普纳断层的地震活动性

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Nicolas Harrichhausen, Laurence Audin, Stéphane Baize, Kendra L. Johnson, Céline Beauval, Paul Jarrin, Léo Marconato, Frédérique Rolandone, Hervé Jomard, Jean-Mathieu Nocquet, Alexandra Alvarado, Patricia A. Mothes
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引用次数: 0

摘要

摘要探讨了断层源模型中滑动速率的变化如何影响厄瓜多尔帕拉坦加-普纳断层系统的地震速率计算。在概率地震危险性评估(PSHA)中,确定最能代表断裂带地震活动性的滑动率是至关重要的。然而,考虑到不同的空间和时间尺度,沿同一断层可以观察到明显不同的滑动速率。厄瓜多尔南部的帕拉坦加-普纳断层是一个典型的断层,在那里,人们使用跨越不同空间和时间尺度的方法测量了不同的滑动速率,其中的历史数据和古地震研究提供了相对较长时间跨度内的大地震记录。我们利用断层源模型计算了帕拉坦加-普纳断层在不同滑动率和几何形状下的地震率,并将计算得到的震级-频率分布(MFDs)与断裂带地震目录MFDs进行了比较。我们表明,在整个断裂带宽度上测量的滑动率,无论是基于大地测量还是长期地貌偏移,都能产生与目录数据相比更有利的计算mfd。此外,我们还表明,当计算的MFD遵循混合特征MFD形状时,它们最适合地震目录数据。这些结果支持这样的假设,即从断层系统的单个断层链中得出的滑动率不能代表整个断裂带产生的地震活动性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fault Source Models Show Slip Rates Measured across the Width of the Entire Fault Zone Best Represent the Observed Seismicity of the Pallatanga–Puna Fault, Ecuador
Abstract We explore how variation of slip rates in fault source models affect computed earthquake rates of the Pallatanga–Puna fault system in Ecuador. Determining which slip rates best represent fault-zone seismicity is vital for use in probabilistic seismic hazard assessment (PSHA). However, given the variable spatial and temporal scales slip rates are measured over, significantly different rates can be observed along the same fault. The Pallatanga–Puna fault in southern Ecuador exemplifies a fault where different slip rates have been measured using methods spanning different spatial and temporal scales, and in which historical data and paleoseismic studies provide a record of large earthquakes over a relatively long time span. We use fault source models to calculate earthquake rates using different slip rates and geometries for the Pallatanga–Puna fault, and compare the computed magnitude–frequency distributions (MFDs) to earthquake catalog MFDs from the fault zone. We show that slip rates measured across the entire width of the fault zone, either based on geodesy or long-term geomorphic offsets, produce computed MFDs that compare more favorably with the catalog data. Moreover, we show that the computed MFDs fit the earthquake catalog data best when they follow a hybrid-characteristic MFD shape. These results support hypotheses that slip rates derived from a single fault strand of a fault system do not represent seismicity produced by the entire fault zone.
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来源期刊
Seismological Research Letters
Seismological Research Letters 地学-地球化学与地球物理
CiteScore
6.60
自引率
12.10%
发文量
239
审稿时长
3 months
期刊介绍: Information not localized
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