Seismic Microzonation of Lima City and El Callao Province, Peru

Abstract eng:
The location of Lima city and El Callao Province over the Pacific Ring of Fire and the long history of seismic activity in these places were the main reasons to develop a seismic microzonation study. This study is based on the results of a geological, geotechnical and geophysical exploration. Geology allowed identifying areas with potential rockfall over the hills that surround Lima. The geotechnical exploration consisted of carrying out SPT and drilling boreholes to obtain soil samples which were later tested in a geotechnical laboratory; the results allowed determining the soil mechanical characteristics and consequently identifying their resistance and performance as a foundation material. The geophysical exploration consisted of one-point microtremor measurements, array measurements, MASW and refraction tests, which allowed to find the natural period of vibration, and the P and S-wave velocity profiles, which lead us to know the dynamical characteristics of the soils. The results obtained from the geology, the geotechnical and geophysical exploration were combined to develop various maps, such as the soil distribution map, the isoperiod map, and the seismic microzonation map for Lima city and El Callao Province. This last map shows five zones, where the zone with the best soil mechanical and dynamic characteristics covers most of the study area.

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