A Source and Wave Propagation Study of the Copalillo, Mexico, Earthquake of 21 July 2000 (Mw 5.9): Implications for Seismic Hazard in Mexico City from Inslab Earthquakes

2002 ◽  
Vol 92 (3) ◽  
pp. 1060-1071 ◽  
Author(s):  
A. Iglesias
Keyword(s):  
Wave Propagation ◽  
Seismic Hazard ◽  
Mexico City ◽  
Mexico Earthquake

The Mexico Earthquake of September 19, 1985—Ductility and Resistance Requirements Imposed on a Concrete Building

1989 ◽  
Vol 5 (1) ◽  
pp. 41-50 ◽  
Author(s):  
E. Sordo ◽  
A. Terán ◽  
J. J. Guerrero ◽  
H. Juárez ◽  
J. Iglesias
Keyword(s):  
Dynamic Analysis ◽  
Mexico City ◽  
Spectral Response ◽  
The Real ◽  
Linear Dynamic ◽  
Ductility Factor ◽  
Concrete Building ◽  
Waffle Slab ◽  
Mexico Earthquake ◽  
Peak Value

This paper describes the study of a twelve floor concrete building with a waffle slab system located 300 meters from the accelerometer at Secretaria de Comunicaciones y Transportes (S.C.T) in Mexico City. First, the reduced seismic coefficient associated with the failure of the critical story is calculated by a linear dynamic analysis which reproduces the damage provoked by the 1985 earthquake to the real structure. Second, the ductility factor associated with the damaged stories is obtained through a step-by-step non-linear dynamic analysis. Finally, the peak value of the S.C.T. maximum ordinate for spectral response corresponding to 5 percent of critical damping was determined from this analysis.

The Mexico Earthquake of September 19, 1985—New Accelerograph Network for Mexico City

1989 ◽  
Vol 5 (1) ◽  
pp. 249-255 ◽  
Author(s):  
J. M. Espinosa-Aranda ◽  
A. Uribe ◽  
B. Frontana ◽  
O. Contreras ◽  
G. Ibarrola
Keyword(s):  
Local Government ◽  
Mexico City ◽  
Seismic Records ◽  
Mexico Earthquake ◽  
Field Stations

As a result of the observed effects induced by the earthquakes of September 1985 in Mexico City's structures, the local government authorities increased their support for the installation of accelerographs in a network covering different zones of Mexico City. This paper presents the activities developed by the Centro de Instrumentación y Registro Sísmico (CIRES) concerned with: selection and procurement of suitable instruments, identification of the installation sites, and the installation of field stations. We also describe methods applied to the processing of seismic records and include a summarized catalog of accelerograms recorded to date.

Intraslab versus Interplate Earthquakes as Recorded in Mexico City: Implications for Seismic Hazard

2015 ◽  
Vol 31 (2) ◽  
pp. 795-812 ◽  
Author(s):  
Shri K. Singh ◽  
Mario Ordaz ◽  
Xyoli Pérez-Campos ◽  
Arturo Iglesias
Keyword(s):  
Seismic Hazard ◽  
Mexico City ◽  
Return Period ◽  
High Frequency ◽  
Relative Importance ◽  
The Hill ◽  
The City ◽  
Careful Assessment ◽  
Interplate Earthquakes

We study the relative importance of interplate and intraslab earthquakes in the seismic hazard of Mexico City by analyzing accelerograms recorded at the hill-zone site of CU (1964–2012) and the lake-bed site of SCT (1985–2012). Amax exceeded 6 gal during 20 earthquakes at CU during this period. Of these, eight were intraslab events so that the exceedance rate of Amax ≥ 6 gal from both types of earthquakes is roughly about the same. The estimated return period of Amax of 30 gal from the two types of earthquakes is ∼100 yrs. If we consider high-frequency (2.5–8.5 Hz) acceleration ( AmaxHF) at CU, then the top 7 out of the 20 events are all intraslab earthquakes. Even at the lake-bed site of SCT, the AmaxHF values are, generally, associated with intraslab earthquakes. It follows that the risk from both types of earthquakes to low-rise construction in the city needs careful assessment.

The Mexico Earthquake of September 19, 1985—Case Studies of Seismic Strengthening for Two Buildings in Mexico City

1989 ◽  
Vol 5 (1) ◽  
pp. 153-174 ◽  
Author(s):  
D. A. Foutch ◽  
K. D. Hjelmstad ◽  
E. Del Valle Calderón ◽  
E. Figueroa Gutiérrez ◽  
R. E. Downs
Keyword(s):  
Reinforced Concrete ◽  
Mexico City ◽  
Reinforced Concrete Frame ◽  
Concrete Walls ◽  
Concrete Frame ◽  
Reinforced Concrete Walls ◽  
Steel Bracing ◽  
Geotechnical Investigations ◽  
Mexico Earthquake ◽  
The City

The earthquake that shook Mexico City on 19 September 1985, destroyed several hundred buildings and took thousands of lives. Two buildings located in the most highly damaged part of the city experienced strong shaking, but suffered only slight damage. These reinforced concrete frame buildings had been retrofit with steel bracing systems and infill reinforced concrete walls prior to the earthquake. Forced vibration tests, analytical studies and geotechnical investigations for each building have been conducted. The results indicate that the steel bracing systems strengthened the buildings and stiffened them, moving their natural periods away from the 2.0-second predominant ground period in that part of the city. Implications for the design of strengthening systems have been determined.

The Mexico Earthquake of September 19, 1985—Statistics of Damage and of Retrofitting Techniques in Reinforced Concrete Buildings Affected by the 1985 Earthquake

1989 ◽  
Vol 5 (1) ◽  
pp. 145-151 ◽  
Author(s):  
J. Aguilar ◽  
H. Juárez ◽  
R. Ortega ◽  
J. Iglesias
Keyword(s):  
Reinforced Concrete ◽  
Statistical Analysis ◽  
Data Base ◽  
Mexico City ◽  
Failure Modes ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Mexico Earthquake

The 1985 Mexico City earthquake caused very serious damage, especially in reinforced concrete buildings, making it necessary to repair and strengthen many structures. The authors had the opportunity to study 114 of these retrofitted buildings. The data base created with the collected information contains the description of the building, its damages and the retrofitting techniques used. The statistical analysis of this information makes it possible to identify the correlation among the structural and foundation types, the dominant failure modes, the causes of damage and the repair and strengthening techniques used in this group of buildings.

The Mexico Earthquake of September 19, 1985—Typical Cases of Repair and Strengthening of Concrete Buildings

1989 ◽  
Vol 5 (1) ◽  
pp. 175-193 ◽  
Author(s):  
M. Jara ◽  
C. Hernández ◽  
R. García ◽  
F. Robles
Keyword(s):  
Case Studies ◽  
Mexico City ◽  
Damage Assessment ◽  
Analysis And Design ◽  
Concrete Buildings ◽  
Temporary Protection ◽  
Practical Design ◽  
Mexico Earthquake ◽  
Emergency Measures ◽  
Made In

It is the aim of this paper to describe the most important techniques that are being used in Mexico City to retrofit buildings damaged during the 1985 earthquake. The information is presented by means of four case studies. These cases offer practical design examples of the typical solutions adopted and illustrate the various aspects of the repair and strengthening process such as damage assessment, emergency measures for temporary protection, the retrofitting technique employed in each case and considerations and decisions made in the analysis and design.

The Mexico Earthquake of September 19, 1985—Past Decisions, Present Danger: An Historical Perspective on Ecology and Earthquakes in Mexico City

1988 ◽  
Vol 4 (3) ◽  
pp. 469-479 ◽  
Author(s):  
S. Tobriner
Keyword(s):  
Mexico City ◽  
Historical Perspective ◽  
The World ◽  
History Of ◽  
Mexico Earthquake

Why is one of the most populous cities in the world built on land which has a history of subsidence, seismicity, and flooding? Mexico City illustrates how early decisions in a city's history can create difficult conditions for building well and living safely. The Aztecs had little choice but to live on the muddy islands in Lake Texcoco which now lie beneath downtown Mexico City. But the Spanish did have a choice. By selecting the island capital of Tenochtitlan for their colonial capital they bequeathed to succeeding generations problems which were apparent to them almost immediately after they began construction. Their solution to the hydraulic problems of the site only exacerbated ecological and seismic problems which the inhabitants of Mexico City face today, and destroyed the reason the first settlers inhabited the Valley of Mexico.

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