Evaluation of Liquefaction Potential Through Geophysical Tests Case: Earthquake in Lagunas, Peru 2019

Jorge Alva, Carmen Ortiz, Joao Rengifo, Grover Riveros

Producción científica: Capítulo del libro/informe/acta de congresoContribución a la conferenciarevisión exhaustiva


On May 26, 2019, at 02:41 h (Peruvian time), the Mw 8.0 Sismo Lagunas 2019 earthquake occurred. It had its epicenter at the coordinates: − 05.74°, − 75.55°, 60 km south of the town of Lagunas (Loreto), at a depth of 135 km with Mw 8.0. It caused a lot of damage, including the liquefaction phenomenon reported in the woody village of Tamarate. The maximum horizontal acceleration recorded was at the UNTRM Station (0.098 g) in Chachapoyas with an epicentral distance of 292.21 km. In December 2019, geophysical tests were conducted in the woody village center of Tamarate, the area where the soil liquefaction event was evidenced. The reasons for choosing to use multi-channel surface wave and ambient vibration tests are based on (i) the fact that the area is only accessible by river. And (ii) the used geophysical equipments are practical and easy to handle and transport compared to the usual equipment such as the Standard Penetration Test and Cone Penetration Test for liquefaction potential evaluation. Multi-channel surface wave and ambient vibration analysis tests were performed to determine the shear wave velocity profile and the fundamental period of the ground. Seismic profiles and average wave velocities were Vs30 (163–168 m/s). The predominant period values obtained in the study area were 0.5 and 0.7 s. The occurrence of soil liquefaction (FSL) was evaluated using the deterministic method as the ratio of the minimum strength normalized cyclic shear stress producing liquefaction or “Cyclic Resistance Ratio” (CRR) divided by the normalized cyclic shear stress induced by the earthquake or “Cyclic Stress Ratio” (CSR). The CRR parameter was determined at each depth up to 30 m. With this evaluation, the actual minimum acceleration value that occurred in Tamarate was found between 0.1 and 0.12 g. A soil liquefaction was generated up to a depth of 13.2 m.

Idioma originalInglés
Título de la publicación alojadaRecent Research on Geotechnical Engineering, Remote Sensing, Geophysics and Earthquake Seismology - Proceedings of the 2nd MedGU, Marrakesh 2022 Volume 3
EditoresMourad Bezzeghoud, Zeynal Abiddin Ergüler, Jesús Rodrigo-Comino, Mahesh Kumar Jat, Roohollah Kalatehjari, Deepak Singh Bisht, Arkoprovo Biswas, Helder I. Chaminé, Afroz Ahmad Shah, A.E. Radwan, Jasper Knight, Dionysia Panagoulia, Amjad Kallel, Veysel Turan, Haroun Chenchouni, Attila Ciner, Matteo Gentilucci
EditorialSpringer Nature
Número de páginas3
ISBN (versión impresa)9783031487149
EstadoPublicada - 2024
Publicado de forma externa
Evento2nd International conference on Mediterranean Geosciences Union, MedGU 2022 - Marrakech, Marruecos
Duración: 27 nov. 202230 nov. 2022

Serie de la publicación

NombreAdvances in Science, Technology and Innovation
ISSN (versión impresa)2522-8714
ISSN (versión digital)2522-8722


Conferencia2nd International conference on Mediterranean Geosciences Union, MedGU 2022


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