Event Date : 04-16-2016
Location : Muisne, Ecuador
Report Date : 10-14-2016
Event Category: Earthquake
Sequence of Events: No
EQ Magnitude : Mw7.8
Report Number: GEER-049
DOI: doi:10.18118/G6F30N
Event Latitude: 0.382
Event Longitude: -79.922
Sissy    Nikolaou
Xavier    Vera-Grunauer
Collaborators: ATC (Applied Technology Council)

The April 2016 Mw7.8 Muisne, Ecuador earthquake and its aftershocks led to hundreds of fatalities, thousands of injuries, tens of thousands of people homeless, serious damage and collapses to buildings and infrastructure, and economic impact estimated at 3% of the national GDP. The performance of the natural and built environment was documented in the geotechnical, structural and nonstructural aspects by the GEER-ATC reconnaissance team that visited the most affected areas. The reconnaissance has yielded datasets, lessons, and suggestions for future research on: (i) seismological and recorded strong ground motions; (ii) application of US rapid assessment methods; (iii) geotechnical and infrastructure performance; (iv) site amplification and liquefaction; (v) structural and nonstructural effects and correlation to geotechnical effects; (vi) critical facilities and seismically-isolated structures response; (vii) use of advanced 3-D technologies to map drone and photo observations; (viii) case histories documentation of successful behavior in addition to failures; and (ix) community/government response and awareness aspects. In future research, the collected data, can be used, in combination with much-needed in-situ geotechnical testing and 3-D mapping to further understand the observations and analyze the good and bad behavior of the natural and built environment. Other needs include evaluation and testing of model houses that can be replicated fast in the field to house the homeless, and development of simple guidelines and procedures that can be used to improve the seismic performance of health care, transportation, and critical facilities.



Alvarado, A., Alzamora, D., Antonaki, N., Arteta, C., Athanasopoulos-Zekkos, A., Bassal, P., Caicedo, A., Casares, B., Davila, D., Diaz, V., Diaz-Fanas, G., Gilsanz, R., González, O., Hernandez, L., Kishida, T., Kokkali, P., López, P., Luque, R., Lyvers, G.M., Maalouf, S., Mezher, J., Miranda, E., Morales Moncayo, E., Nikolaou, S., O’Rourke, T., Ochoa, I., O'Connor, J.S., Ripalda, F., Rodríguez, L.F., Rollins, K., Stavridis, A., Toulkeridis, T., Vaxevanis, E., Vera-Grunauer, X., Villagrán León, N., Wood, C., Yepes, H., Yepez, Y.

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Report Version 1b 10-24-2016
The work of the GEER Association, in general, is based upon work supported in part by the National Science Foundation through the Geotechnical Engineering Program under Grant No. CMMI-1266418. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The GEER Association is made possible by the vision and support of the NSF Geotechnical Engineering Program Directors: Dr. Richard Fragaszy and the late Dr. Cliff Astill. GEER members also donate their time, talent, and resources to collect time-sensitive field observations of the effects of extreme events.