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Seismic source characteristics of the intermediate-depth and intraslab 2019 northern Peru earthquake (Mw 8.0)
Journal of Seismology ( IF 1.6 ) Pub Date : 2021-04-05 , DOI: 10.1007/s10950-021-09996-x
César Jiménez , Nestor Luna , Nick Moreno , Miguel Saavedra J.

On May 26, 2019, an unusual depth-intermediate focus earthquake, in the interior of the Nazca plate, shook the northern Peruvian jungle and caused the death of two victims. This earthquake was felt in almost all of Peru as well as Brazil, Ecuador and Colombia. The focal mechanism calculated is of the normal fault type (strike = 353, dip = 57, rake = − 99) for a focal depth of 114 km. The slip distribution was obtained through an inversion process of teleseismic waveforms. The maximum slip was 6.3 m, located around the central side of the fault plane. The moment magnitude calculated was Mw 8.0; the spectral analysis indicated a similar magnitude of Mw 8.0. The source time function indicates a multiple rupture earthquake, with the presence of several pulses of seismic energy release, with a total duration around 80 s. The rupture directivity was from the south to the north; we have assumed a propagation rupture velocity of 2.8 km/s. The modeled fault plane geometry has dimensions of 208×105 km2. The predicted vertical coseismic deformation field shows a pattern of mostly subsidence.



中文翻译:

2019年秘鲁北部中深度平板内地震的震源特征(Mw 8.0)

2019年5月26日,纳斯卡板块内部发生了一次不寻常的深度中间焦点地震,震撼了秘鲁北部丛林,并造成了两名受害者的死亡。几乎在秘鲁以及巴西,厄瓜多尔和哥伦比亚都感受到了地震。计算出的震源机制是正常故障类型(击= 353 ,浸涂= 57 ,耙= - 99 )的焦深为114公里。滑移分布是通过远震波形的反演过程获得的。最大滑移为6.3 m,位于断层平面的中央附近。计算的力矩大小为Mw 8.0;光谱分析表明Mw 8.0的大小相似。源时间函数表示多次破裂地震,存在多个释放地震能量的脉冲,总持续时间约为80 s。破裂方向是从南到北。我们假设传播破裂速度为2.8 km / s。建模的断层平面几何尺寸为208×105 km 2。预测的垂直同震形变场显示出大部分为沉降的模式。

更新日期:2021-04-05
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