Comparison between rupture parameters of intermediate and deep earthquakes at the Peru–Brazil–Bolivia border and northern Chile

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Carmen Pro, Hernando Tavera, Maurizio Mattesini, Lucía Escudero, Elisa Buforn, Agustín Udías, Estela Centeno
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Abstract

We determined the main parameters of the source rupture process of intermediate- and deep-depth earthquakes occurring in the Peru–Brazil–Bolivia border region and northern Chile. The parameters of depth, fault-plane orientation, scalar seismic moment, slip distribution, and radiated seismic energy are obtained from seismograms. We selected 15 intermediate-depth earthquakes (100 km < h < 300 km) and 10 very deep earthquakes (h > 500 km) with magnitudes MW ≥ 6.0. For most events, the slip distribution over the rupture plane shows a single asperity, and the source time function presents a simple pulse. There are differences between intermediate-depth and deep earthquakes. The rupture areas, maximum slip and source time function (STF) duration are larger for intermediate-depth events than for deep events. Additionally, the STF’s show a sharper increase for deep earthquakes. The scaled radiated seismic energy shows larger values for deep depth events. The stress regime pattern derived from the obtained focal mechanism agrees with the geometry of the subduction of the Nazca plate. At intermediate depths, in the northern area up to 12°S, the stress pattern corresponds to a horizontal extension, while in the southern area, the tension axes dip at an angle of 30°. At deep depths, the stress regime corresponds to vertical compression in the north and dips of approximately 45° in the south.

Abstract Image

秘鲁-巴西-玻利维亚边境和智利北部中深层地震破裂参数的比较
我们确定了发生在秘鲁-巴西-玻利维亚边境地区和智利北部的中深层地震震源破裂过程的主要参数。深度、断层面方位、标量地震力矩、滑移分布和辐射地震能量等参数都是通过地震图获得的。我们选择了 15 次中深度地震(100 km < h < 300 km)和 10 次超深地震(h > 500 km),震级 MW ≥ 6.0。对于大多数地震事件,破裂面上的滑移分布显示为单一斜面,震源时间函数显示为简单脉冲。中深层地震和深层地震之间存在差异。与深层地震相比,中层地震的破裂面积、最大滑移和震源时间函数(STF)持续时间更大。此外,深层地震的震源时间函数(STF)增长更快。按比例辐射的地震能量显示深层地震的数值更大。根据所获得的焦点机制得出的应力机制模式与纳斯卡板块俯冲的几何形状相吻合。在中等深度,即南纬 12 度以内的北部地区,应力模式相当于水平延伸,而在南部地区,张力轴倾角为 30 度。在深层,北部的应力机制相当于垂直压缩,而南部的应力机制则倾角约为 45°。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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