Subsoil classification and geotechnical zonation for Guadalajara City, Mexico: V-s(30), soil fundamental periods, 3D structure and profiles
Por:
Ramirez Gaytan, Alejandro, Estrella, Hortencia Flores, Preciado, Adolfo, Bandy, William L., Lazcano, Salvador, Alcantara Nolasco, Leonardo, Aguirre Gonzalez, Jorge, Korn, Michael
Publicada:
1 abr 2020
Categoría:
Geophysics
Resumen:
Guadalajara, Jalisco, is the second largest city in Mexico with around
4.5 million inhabitants. A high seismic hazard exists in the city due to
forces produced by the interaction between the Rivera, Cocos and North
American plates and the smaller Jalisco Block. Guadalajara is one of the
largest cities built over pumice soil deposits. Furthermore, the
near-surface phreatic level causes a high susceptibility to
liquefaction. All these features can cause extreme earthquake site
effects. Due to the fragile inner structure of pumice sands, traditional
geotechnical tests are inappropriate to characterize the seismic
response. Therefore, we propose the use of surface wave analysis methods
(multichannel analysis of surface waves and refraction microtremor),
which we applied in 33 sites to define the soil classification in terms
of V-S(30) (the average shear wave velocity between the surface and 30 m
depth), the bedrock depth and the fundamental period. From the soil
classification, we construct a microzonation map consisting of four
geotechnical zones, which we superimpose on the known construction
systems within the city. The comparison between the construction period
of the buildings and the fundamental frequencies of the soil indicates a
high vulnerability to resonance in 1- to 4-storied old buildings
constructed of adobe and unreinforced masonry within zones II and III,
followed by a medium vulnerability to seismic resonance in compact
buildings of 1-4 stories within zone I and 1-12 stories within zones II
and IV.
Filiaciones:
Ramirez Gaytan, Alejandro:
UdeG, Dept Ciencias Computac CUCEI, Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico
Estrella, Hortencia Flores:
TU Berlin, Dept Appl Geophys, Inst Appl Geosci, Ernst Reuter Pl 1, D-10587 Berlin, Germany
Preciado, Adolfo:
ITESO, Dept Habitat & Desarrollo Urbano, Perifer Sur Manuel Gomez Morin 8585, Tlaquepaque 45604, Mexico
Bandy, William L.:
Univ Nacl Autonoma Mexico, Inst Geofis, Ciudad Univ, Mexico City 04510, DF, Mexico
Lazcano, Salvador:
Construct Co, Suelo Estruct, Cauda 946-1, Guadalajara 44520, Jalisco, Mexico
Alcantara Nolasco, Leonardo:
Univ Nacl Autonoma Mexico, Inst Ingn, Ciudad Univ, Mexico City 04510, DF, Mexico
Aguirre Gonzalez, Jorge:
Univ Nacl Autonoma Mexico, Inst Ingn, Ciudad Univ, Mexico City 04510, DF, Mexico
Korn, Michael:
Univ Leipzig, Inst Geophys & Geol, Talstr 35, D-04103 Leipzig, Germany
|