Numerical modelling of the 1970 intraslab Peru earthquake and tsunami (Mw 7.9)

César Jiménez, J. Miguel Saavedra, Yolanda Zamudio, Daniel Olcese

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In this research paper, we have modelled the tsunami source of the 1970 Peruvian earthquake. The rupture geometry (of dimensions 150×75 km2) was obtained from the aftershocks distribution. The fault plane geometry was divided into 2 subfaults: the biggest (of 112.5-km length to the northern side) of normal fault plane and the smallest (37.5-km length to the south) of reverse fault plane, due to the seismic event had a complex rupture process. The slip was constrained from the tsunami waveform amplitudes and seismic moment using an iterative approach method, since a data inversion is impossible due to the scarcity of available tsunami data. The simulated vertical deformation field has a particular pattern, it is composed of 4 lobes of alternated uplift and subsidence, the maximum subsidence was 38 cm, and the maximum uplift was 57 cm. We have obtained a seismic moment of 8.92× 1020 Nm and the corresponding moment magnitude was Mw 7.9. The maximum slip was calculated in 1.59 m (reverse fault) and 1.32 m (normal fault). The simulated maximum tsunami height was 93 cm at Salaverry and 73 cm at Chimbote stations.

Original languageEnglish
JournalJournal of Seismology
StateAccepted/In press - 2022
Externally publishedYes

Bibliographical note

Funding Information:
We are grateful for Ms. Mattie Sherwood for the revision of the linguists aspects of the manuscript. Furthermore, we thank the research grant from the Concytec (Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica) of Peru and for Universidad Nacional Mayor de San Marcos.

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature B.V.


  • 1970 Peru earthquake
  • Seismic source
  • Tsunami numerical modelling


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