Tectonophysics2022，Vol.83412.DOI:10.1016/j.tecto.2022.229355

Paleoseismic evidence of the 1715 C.E earthquake on the Purgatorio Fault in Southern Peru: Implications for seismic hazard in subduction zones

Benavente, Carlos Palomino, Anderson Wimpenny, Sam Garcia, Briant Rosell, Lorena Aguirre, Enoch Machare, Jose Padilla, Alba M. Rodriguez Hall, Sarah R.
Tectonophysics2022，Vol.83412.DOI:10.1016/j.tecto.2022.229355
✕
  • NSTL
  • Elsevier

Paleoseismic evidence of the 1715 C.E earthquake on the Purgatorio Fault in Southern Peru: Implications for seismic hazard in subduction zones

Benavente, Carlos 1Palomino, Anderson 1Wimpenny, Sam 2Garcia, Briant 1Rosell, Lorena 1Aguirre, Enoch 1Machare, Jose 3Padilla, Alba M. Rodriguez 4Hall, Sarah R.5
扫码查看

作者信息

  • 1. Inst Geol Minero & Metalurg INGEMMET
  • 2. Univ Cambridge
  • 3. Natl Univ Engn
  • 4. Univ Calif Davis
  • 5. Coll Atlantic
  • 折叠

Abstract

Active faults in the forearc of southern Peru pose a poorly understood hazard to the region. The Purgatorio Fault is a 60 km-long fault that extends between Moquegua and Tacna that has hosted several scarp-forming earthquakes over the last 6 ka. We present new measurements of the fault scarp geomorphology along the Purgatorio Fault, and use dating of the stratigraphy within a new paleoseismic trench excavated across the fault to establish the chronology of scarp formation. We find that the most recent surface-rupturing earthquake on the Purgatorio Fault occurred sometime between 1630C.E and 1790C.E and had a moment magnitude (M-w) of similar to 7. We propose that this most recent surface-rupturing earthquake on the Purgatorio Fault was the 1715C.E earthquake recorded in the historical catalogue of the region, which was previously attributed to the megathrust offshore. Our results highlight the importance of establishing a paleoseismic record of onshore faults to differentiate between major megathrust and forearc earthquakes. Given the proximity of these shallow, onshore faults to coastal communities in Peru, the shallow earthquakes they generate may pose a severe, yet often overlooked, seismic hazard.

Key words

Forearc crustal earthquakes/Subduction zones/Geomorphology/Palaeoseismology/Historical earthquake/CLIMATE-CHANGE/FORE-ARC/DEFORMATION/RECONSTRUCTION/OSCILLATION/TECTONICS/ERUPTION/MOTION/TOOL

引用本文复制引用

出版年

2022
Tectonophysics

Tectonophysics

EISCI
ISSN：0040-1951
被引量1
参考文献量45
段落导航相关论文