Impact of Upper-Plate Faulting on Megathrust Foreshocks: Insights From the 2014 Iquique Earthquake

被引:1
|
作者
Julve, J. [1 ]
Moreno, M. [2 ]
Barbot, S. [3 ]
Tassara, A. [1 ]
机构
[1] Univ Concepcion, Earth Sci Dept, CONCEPCION, Chile
[2] Pontificia Univ Catolica Chile, Dept Struct & Geotech Engn, Santiago, Chile
[3] Univ Southern Calif, Earth Sci Dept, Los Angeles, CA USA
基金
美国国家科学基金会;
关键词
subduction earthquakes; upper-plate faulting; foreshock seismicity; PRESSURE SOLUTION CREEP; M-W; 8.1; SUBDUCTION ZONE; SEISMIC CYCLE; CHILE; SLIP; EVOLUTION; STRENGTH; SEQUENCE; COMPLEX;
D O I
10.1029/2024GL111064
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The role of upper-plate faulting in the seismic cycle of large megathrust earthquakes remains poorly understood. We use quasi-dynamic numerical simulations of seismic cycles to analyze the interaction between crustal faulting and the foreshock sequence of the 2014 Iquique (Mw 8.2) earthquake in Northern Chile. Multi-cycle models incorporating upper-plate faulting align better with coseismic displacements, replicating events akin to the Iquique earthquake. Upper-plate faulting significantly influences foreshock seismicity and deformation patterns. By calibrating the average hydraulic state-varying the effective normal stress-along the megathrust with pre-earthquake seismicity, we find that lower pore pressure ratios result in more seismicity before the mainshock. This implies that the hydraulic state of the megathrust is critical for foreshock activity. This comprehensive modeling approach underscores the importance of the mechanical interplay between the megathrust and upper-plate faults in precursory sequences of large subduction zone earthquakes.
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收藏
页数:11
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