The 2007 Peru Earthquake: Subduction Zone Dynamics and Regional Seismic History

On 15 August 2007 at 23:40 local time, a magnitude 8.0 earthquake struck 41 km southwest of San Vicente de Cañete, Peru, at a focal depth of 39 km. This event remains the sole M8.0 or greater earthquake recorded in the region since 2000 and exemplifies the persistent seismic hazard along Peru’s central coast. The earthquake originated within the Peru subduction zone, where the Nazca Plate converges with and subducts beneath the South American Plate at approximately 6–7 cm per year. This tectonic interaction produces the Peru-Chile Trench and drives megathrust faulting at depths typically between 20 and 60 km. The 39 km depth of the 2007 rupture placed it squarely within the seismogenic zone, allowing efficient transmission of energy to the surface and generation of strong ground motions across the Lima–Ica corridor. Peru’s geologic record documents repeated great earthquakes along this margin. Notable historical events include the 1868 Arica earthquake (estimated M8.5–9.0), the 2001 Arequipa earthquake (M8.4), and earlier events in 1687 and 1746 that devastated colonial Lima. These ruptures illustrate the segmented nature of the subduction interface, with individual segments capable of storing strain over centuries before releasing it in large events. The 2007 rupture filled a recognized seismic gap between the 1974 and 1996 source zones, consistent with the pattern of quasi-periodic strain release along the central Peruvian margin. Post-2007 geodetic studies using GPS and InSAR have refined models of interseismic locking, confirming that the region continues to accumulate elastic strain at rates sufficient to generate future M8+ events. Updated seismic hazard assessments by national and international agencies incorporate these findings, emphasizing the potential for both interface thrust earthquakes and associated tsunamis along the narrow coastal plain. The 2007 event therefore serves as a benchmark for understanding subduction-zone behavior in Peru, highlighting both the tectonic drivers and the long-term seismic history that continue to shape hazard mitigation strategies for the region.

References

USGS Earthquake Catalog (event page for 2007-08-15 Peru event)
Global CMT catalog
Instituto Geofísico del Perú seismic reports