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Title:The Pisco-Chincha Earthquake of August 15, 2007;
Seismological, Geotechnical and Structural Assessments
Author(s):Elnashai, Amr S.; Alva-Hurtado, Jorge; Pineda, Omar; Kwon, Oh-Sung; Moran-Yanez, Luis; Huaco, Guillermo; Pluta, Gregory
MAE Center
Abstract:The coastal region of Central Peru was hit by a major offshore earthquake of magnitude 8.0 ± 0.1 on 15 August 2007; the event is hereafter referred to as the Pisco-Chincha earthquake. The Mid-America Earthquake Center dispatched a field reconnaissance team to the affected area less than two weeks later. The MAE Center team was joined by experts from Universidad Nacional de Ingeniería and Centro Peruano-Japonés de Investigaciones Sísmicas y Mitigación de Desastres. The combined team spent one week in the field, followed by many months of back-analysis and detailed investigation of the collected information. This report summarizes the work of the team on the historical earthquake catalogue of Peru, and the attribution of each major earthquake to the complex and multiple inclinations subduction regime controlling the seismicity of the coastal Peruvian planes. It includes an in-depth study of the attenuation of ground motion and application of a modern and well-verified strong-motion model to the derivation of hazard maps for the region. The available acceleration records are extensively analyzed and elastic and inelastic spectra derived, and compared to earthquakes of similar magnitude. A set of records are selected from the international data bank to represent the hazard from the Pisco-Chincha earthquakes in regions where no records are available. Significant effort is allocated in the report to the geological and geotechnical settings as well as observations of damage to foundation, slumping and soil liquefaction. A structure in the university of Ica complex that was damaged by the earthquake is modeled and back-analyzed using an actual record from the Pisco-Chincha earthquake. The failure mode is identified and attributed to layout and design deficiencies. Comments on the structural performance of all types of buildings and bridges are made. The report concludes with a summary of the findings, and recommendations covering hazard, risk management, design and construction, and legislation.
Issue Date:2008-11
Series/Report:Mid-America Earthquake Center Report 08-01
Genre:Technical Report
Sponsor:National Science Foundation EEC-9701785
Date Available in IDEALS:2009-01-06

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