Tsunami characteristics and source estimation of the 2024 Yauca (Peru) earthquake

Wang Y.; Jiménez C.; Moreno N.; Wang P. · Ocean Engineering (2025) · DOI: 10.1016/j.oceaneng.2025.121325

Resumen

The 2024 Yauca earthquake occurred on June 28 as a result of the subduction of the Nazca Plate beneath the South American Plate along the Peru-Chile Trench. It generated a moderate tsunami, which was recorded by tide gauges and offshore buoys. We removed low-frequency components from the sea level elevation records and analyzed the characteristics of the tsunami waveforms. Additionally, wavelet analysis was performed to investigate the temporal variations in dominant periods. We conducted a joint inversion using tsunami data from San Juan de Marcona, Chala, and DART 32401, along with teleseismic data from 25 broadband stations. A finite-fault model of 80.0 km × 60.0 km was proposed, consisting of 8 × 6 subfaults. We changed the rupture velocity (Vr) from 1.8 to 4.2 km/s. The optimum Vr was 3.6 km/s. In this scenario, the maximum and average slip values were 0.65 and 0.27 m, respectively. The finite-fault model resulted in a seismic moment (M0) of 4.738 × 1019 Nm and a moment magnitude (Mw) of 7.05. Our proposed model can effectively reproduce the tsunami behavior along the southern coast of Peru. It helps to understand the tsunami and earthquake hazards in this region.

Instituciones: Universidad Nacional Mayor de San Marcos