Jorge Aguirre González- PhD
- Researcher at National Autonomous University of Mexico
Jorge Aguirre González
- PhD
- Researcher at National Autonomous University of Mexico
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54
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Publications (54)
The effects of a synthetic M 7.1 strike lateral earthquake are evaluated at five sites in Michoacan state, western Mexico. In this work, the ground motion simulation was applied using the empirical Green’s function method proposed by Irikura (1986) by scaling the recordings of an M 5.1 left-lateral event to a hypothetical M 7.1 event assuming the s...
This paper aims to obtain compressional body waves (seismic sections) to delimit geological structures associated with hydrocarbon reservoirs. We used a passive seismic dataset from a rectangular array located at northeast of Mexico. Seismic Interferometry (IS) method, which allows extracting the Green’s function by using cross-correlations (CC(t))...
We present a model of shear wave velocity for the botanical garden of the Benemérita Universidad Autónoma de Puebla in Puebla City using ambient seismic noise recorded on a geotechnical scale array. We estimate phase velocity dispersion curves of Rayleigh waves, using the Modified Spatial Autocorrelation Method (MSPAC), between 1.5 and 7.1 Hz. Also...
En este estudio se obtuvo un perfil de refracción sísmica usando registros de ruido sísmico. Las señales fueron registradas en un tendido de refracción ubicado al poniente de la ciudad de México. El tendido consistió en un arreglo lineal de 24 geófonos verticales con una separación de 2 metros y una longitud de registro de 175 minutos. El perfil de...
El 7 de septiembre del año 2017 ocurrió el último sismo que generó daños en la ciudad de Tuxtla Gutiérrez, Chiapas. Al analizarlo en conjunto con los sismos históricos más importantes en la región (7 de abril de 2011, 21 de octubre de 1995 y 23 de septiembre de 1902), y localizando los daños mediante un Sistema de Información Geográfica, se observó...
El 7 de septiembre del año 2017 ocurrió el último sismo que generó daños en la ciudad de Tuxtla Gutiérrez, Chiapas. Al analizarlo en conjunto con los sismos históricos más importantes en la región (7 de abril de 2011, 21 de octubre de 1995 y 23 de septiembre de 1902), y localizando los daños mediante un Sistema de Información Geográfica, se observó...
In this work, a one-dimensional (1-D) seismic velocity model is proposed for the central portion of the sub-basin of Chalco, located in the southeast (SE) sector of the basin of Mexico. The seismic model was integrated from spectral analysis of the seismic ambient vibrations (microtremors or seismic noise) records, through the methodologies of Modi...
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, t...
Se reporta una estimación de los períodos fundamentales del suelo (Ts) en 500 sitios del sur del Valle de México (VM), junto con su desviación estándar o incertidumbre (𝜎𝑇𝑠). Los valores de Ts se obtuvieron empleando registros continuos de ruido sísmico ambiental (RSA). Además, se analiza el comportamiento temporal y espacial, tanto individual como...
The main objective of this article is to estimate the synthetic accelerograms of an earthquake with a magnitude of 7.3 in the City of Tapachula, Chiapas, which ocurred on november 7, 2012 on the coasts of Guatemala. In this paper, the methods of the Empirical Transfer Functions and the Boore's Stochastic Method (1983, 2003), which is useful to simu...
Con la motivación de los eventos sísmicos recientes se revisa el ambiente sísmico en el que el país está inmerso y su sismicidad. Los mecanismos y regiones de generación de los sismos. Se mencionan algunos de los parámetros que determinan la intensidad a diferencia de la magnitud de los sismos y la forma de hacer predicciones con los datos provenie...
The high seismic hazard level of the city of Tapachula (Chiapas, Mexico) and observed geological differences in the urban area requires a V S surface structure estimate in order to know the characteristics of local seismic response. In this work we have used empirical methods to characterize earthquake ground motion in different zones of the city....
The 19 September 1985 (Mw8.1) earthquake, located on the Michoacán coast, Mexico, generated great damage in Mexico City, more than 300 km away from the epicentral area. Other important cities near the coast and in central Mexico also suffered severe damage. Thirty years after this important event, the National Autonomous University of Mexico (UNAM)...
El presente trabajo describe las características de un software desarrollado mediante un algoritmo programado con MatLab que contempla las etapas de peligro sísmico de la zona de estudio, la vulnerabilidad estructural de las construcciones características de la región y finalmente permite la generación de escenarios de riesgo sísmico para los event...
Seven slip models currently available from kinematic inversions, derived from near‐source strong‐motion and teleseismic body waves in the 0–1.25 Hz frequency range from Mexico’s subduction zone, are used to estimate source‐scaling relationships applicable to the region. Our results are compared with existing scaling relations for subduction environ...
The soil structure of Tuxtla Gutierrez valley has generated great interest because of observed structural damage caused by ground motion during different earthquakes. Previous studies identified high amplifications in a frequency band of 1 - 10 Hertz. At the moment there is not a reliable subsoil geologic-seismic model to depths that can define pro...
The soil structure of Tuxtla Gutiérrez valley has generated great interest because of observed structural damage caused by ground motion during different earthquakes. Previous studies identified high amplifications in a frequency band of 1 - 10 Hertz. At the moment there is not a reliable subsoil geologic-seismic model to depths that can define pro...
On March 11th, 2011, a magnitude Mw 9.0 earthquake took place off the Pacific coast in the Tohoku region of Japan. The consequences of the earthquake, in particular those due to the tsunami that followed, were devastating. There were around 20 000 fatalities or disappeared persons, it was necessary to evacuate more that 130 000 people and the econo...
Presentamos resultados de la exploración del subsuelo en la zona de lago de la Ciudad de México utilizando correlación de registros de microtremores. Registramos microtremores con estaciones de banda ancha. La duración de los registros varió entre pocos minutos y una hora. Los componentes verticales de los registros se analizaron usando los métodos...
El registro y los análisis de microtremores es hoy en día una parte fundamental en la evaluación del riesgo sísmico. En este trabajo se discute la aplicabilidad y resultados con el método de Autocorrelación Espacial (SPAC), que permite obtener un modelo de velocidad sitio, así como la estimación del modelo propagación de ondas ID, complementarla es...
Resumen: Se estimó la estructura estratigráfica de los depósitos sedimentarios profundos en el valle de Chilpancingo Guerrero, México, y la variación de la velocidad de las ondas de cortante con la profundidad. Se realizaron mediciones simultáneas de microtremores a partir de arreglos de sismómetros en dos sitios del valle. Para determinar las curv...
The Tecoman, Mexico, earthquake (21 January 2003, 20: 06) shows directivity in the area in which it spread (the Colima graben). The presence of soft soils and the location of 8 out of 10 major urban zones in the area are important factors concerning the acceleration, peak ground acceleration (PGA), and Modified Mercalli Intensity (MMI) caused by th...
The geological structure of the deep sedimentary deposits in the valley of Chilpancingo and the variation of the shear wave velocity with depth were determined. Simultaneous measurements of microtremors from arrangements of seismometers were taken in two sites in Chilpancingo, the capital of the State of Guerrero, Mexico. The Spatial Autocorrelatio...
In this study, we generate a source model for the Tecomán Mexico earthquake of January 22, 2003. The presence of soft soils and the location of eight of the ten major cities of Colima state in its earthquake prone area are important factors to model the seismic source. We model in the frequency interval of 1-10 Hz, because many buildings, bridges a...
Se presentan resultados sobre estimaciones de los efectos de sitio y la amplificación en Chilpancingo a partir del análisis de acelerogramas de los sismos más intensos registrados en esa ciudad. Los efectos de sitio fueron determinados con dos técnicas diferentes, primero usando la relación espectral entre suelo y roca (FTE), además de la relación...
Several attenuation relationships have been developed for Mexico, mostly after the earthquake of September 19, 1985, an event that gave great impetus to the development of engineering seismology in Mexico. Since 1985, the number of seismic stations in the country has increased significantly, especially between the Coast of Guerrero and Mexico City....
The study of the site effects in south-central Mexico has a vital importance due to the large seismic events in its history. The 1985 earthquake revealed fundamental aspects of site effects in a lacustrine zone. Along the Mexican Volcanic Belt (CVM), and especially in areas of lacustrine basin formation, site effects have caused damages in urban zo...
naturales y actividad humana, que da lugar a microtremores, y a partir de éstos se hizo una zonificación. Con los cocientes espectrales de las componentes horizontal y vertical (H/V) de los microtremores y aplicando el método de Nakamura (1989) se estimaron periodos dominantes. Los resultados obtenidos demuestran que, no obstante el sustrato rocoso...
The study of the site effects in south-central Mexico has a vital importance due to the large seismic events in its history. The 1985 earthquake revealed fundamental aspects of site effects in a lacustrine zone. Along the Mexican Volcanic Belt (CVM), and especially in areas of lacustrine basin formation, site effects have caused damages in urban zo...
The study of Microtremors (environmental vibration) has become one of the key parts for the evaluation of seismic risk. That is because they can be used to estimate the site effects. The first approach is by obtaining the dominant period of the site through the H/V spectral ratio (Nakamura method). However there are parts of the body and surface wa...
Haciendo uso del método de las funciones de Green empíricas, de los registros de los sismos del 21 de enero de 2003 (Mw 7.5) y 19 de noviembre de 2006 (Mw 5.5), se generan modelos de fuente con diferente número, distribución y tamaño de las áreas de generación de movimientos fuertes SMGA (Strong Motion Generation Area) para el sismo de Tecomán. Est...
The present paper describes a numerical model to study the seismic response of a soft or loose soil deposit stiffened with rigid inclusions as an alternative foundation solution. Modelling was performed using a 2D dynamic finite element method in which the relevant construction stages of the rigid inclusions and different types of arrays were studi...
For the source characterization of Mexican subduction earthquakes we used records from the Guerrero Accelerograph Array for earthquakes occurr-ing during the last 15 years with seismic moments ranging from 6:37E23 to 1:15E28 dyne cm. After removing the path and site effects, we obtained the flat level from the source acceleration spectra versus s...
We present a study of the ground motion and resulting amplification in the Mexico City Basin due to strong earthquakes in the Mexican Pacific Coast. We propose an approximation of the regional structure and Mexico City's basin and analyze their response to two shallow earthquakes generated near the coast. We compare two sets of three dimensional si...
Three-dimensional simulations of earthquake ground motion in sedimentary valleys have led to a deeper understanding of wave propagation and site effects in urban regions. In this paper we present a preliminary study of the ground motion and resulting amplification in the Mexico City Basin due to strong earthquakes in the Pacific Coast of Mexico. Th...
One of the main parts of seismic risk studies is to determine the site effect. This can be estimated by means of the microtremors measurements. From the H/V spectral ratio (Nakamura, 1989), the predominant period of the site can be estimated. Although the predominant period by itself can not represent the site effect in a wide range of frequencies...
SUMMARY The purpose of this note is to contribute to the understanding of seismic ground motion in Mexico City. To this end, we (1) compute theoretical transfer functions for various models for the deep structure and the shallow clay layers, (2) study the seismic responses of various sites within the city using spectral ratios (of horizontal motion...
This article presents an application of a procedure to invert the high-frequency radiation process at the source during the 1995 Hyogo-ken Nanbu earth-quake using the envelopes of acceleration waveforms from 16 stations. The inversion uses genetic algorithms that compare observed ground motions with synthetic ones calculated using empirical Green's...
Even though the majority of earthquakes in Mexico and in the world are in direct relation with the movement of tectonic plates, there are less frequent tremors which take place in the continents, within the plates. This is the case with the earthquakes which occur in Mexico along Neovolcanic Axis. Despite the fact that these earthquakes in the Neov...
Debido a la sencillez de su registro y a la facilidad relativa de su análisis, los microtremores se han convertido en una herramienta de gran utilidad para los estudios de microzonificación sísmica.
El método SPAC propuesto por Aki (1957) permite obtener información sobre la estratigrafía del sitio en estudio, a partir de registros de microtremores...
Microtremor recordings have become a useful tool for microzonation studies in countries with low to moderate seismicity and also in countries where there are few seismographs or the recurrence time for an earthquake is quite long. Microtremor recordings can be made at almost any time and any place without needing to wait for an earthquake. The meas...
The site effects and the source parameters, are inverted from a Fourier
displacement spectra of seismograms that are corrected by geometrical
spreading and regional attenuation valid for south center of
Mexico(Ordaz and Singh, 1992). We used Genetic Algorithms (GA) to
perform the non-linear inversion, like in the MAI method (Moya et al.,
2000) . Th...
The low-frequency flat levels and corner frequencies of the aftershocks of the Kobe earthquake, together with the site effects of the recording stations, are inverted by using genetic algorithms. All records were corrected by the quality factor, Q, of propagation-path, and for each aftershock, a different omega-squared model was assumed such that t...
Clear nonlinear behavior is analyzed from the acceleration records of the 1995 Hyogo-ken Nanbu earthquake at Port Island, Kobe. From four triaxial in- struments placed at four different depths, the surficial effects during strong ground motions were compared with those during weak motions before and after the main- shock. We used a spectral ratio t...
Presently work is presented a proposal of seismic Microzonificación using the method of Nakamura.Based on the mensuration of environmental vibration, with the purpose of obtaining the fundamental period of the floor to have a better knowledge of the behavior before a seismic event.
The 1985 Michoacán earthquake highlighted the seismic risk in Mexico City posed by large magnitude (M>7) earthquakes at the subduction interface off the Pacific Coast of Mexico. Although more than 300 km away from the 1985 earthquake, Mexico City suffered a disproportionate amount of overall damage and loss, especially in the lakebed region. Extens...
RESUMEN Se presentan resultados sobre estimaciones de los efectos de sitio en Chilpancingo y su relación con las direcciones acimutales y con las direcciones principales de la energía de los acelerogramas de los sismos más intensos registrados en esa ciudad. Los efectos de sitio fueron determinados para varias direcciones usando la relación espectr...
