Arturo Iglesias

Arturo Iglesias
Universidad Nacional Autónoma de México | UNAM · Institute of Geophysics

PhD

About

99
Publications
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1,560
Citations
Additional affiliations
April 2013 - present
Universidad Nacional Autónoma de México
Position
  • Managing Director

Publications

Publications (99)
Article
Full-text available
On 20 March 2012, a Mw 7.5 thrust earthquake started a series of seven large events (7.0 ≤ Mw ≤ 8.2) that struck central Mexico during a period of 9 years (2012–2021). Before this event, the Mexican subduction zone did not experience significant subduction earthquakes (Mw > 7.0) for at least 12 years. Five of the events occurred in the plate interf...
Article
Between August 2014 and February 2015, a caldera collapse process in Bárðarbunga volcano accompanied a fissure eruption at the Holuhraun lava field after magma had propagated laterally 45 km from the Bárðarbunga magma chamber to the lava field. The Icelandic Meteorological Office (IMO) reported around 30,000 earthquakes at the caldera, including mo...
Article
Full-text available
The rate of earthquakes with magnitudes Mw ≤ 7.5 in the Ometepec segment of the Mexican subduction zone is relatively high as compared to the neighboring regions of Oaxaca and Guerrero. Although the reason is not well understood, it has been reported that these earthquakes give rise to a large number of aftershocks. Our study of the aftershock sequ...
Article
Full-text available
Con el objetivo de obtener las soluciones del tensor de momento para temblores con M ? 4.0 reportados en el territorio nacional en el periodo 2000-2018, hemos analizado más de 20,000 temblores utilizando las formas de onda y el catálogo del SSN (Servicio Sismológico Nacional). Debido al número de eventos, en este artículo proponemos un procedimient...
Article
Full-text available
Seismicity in the subducted Cocos plate below central Mexico, defined by moderate and large earthquakes, ceases well before reaching the active volcanic front. No intraslab earthquake has been reliably located below Nevado de Toluca and Popocatepetl volcanos. Here we report on an M w3.3 event at a depth of 98 km, 38 km to the west of Nevado de Tolu...
Article
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We derive group velocity maps for crustal Rayleigh waves across Costa Rica and corresponding 3-D shear-wave velocity structure from ambient noise cross-correlations between 56 seismic broadband stations. The daily inter-station cross-correlations for the period 2010–2015 of 56 seismic broadband stations are stacked and analysed to warrant a robust...
Article
We use accelerograms, seismograms, and data from sparse continuous Global Positioning System (GPS) and campaign‐mode GPS stations, deployed along the Pacific coast of Mexico, to study scaling of horizontal peak ground displacement (PGD) with seismic moment (M0) in the epicentral zone above the Mexican subduction thrust. The thrust interface is loca...
Article
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We report on rupture directivity during 8 and 10 May 2014 earthquakes (Mw 6.5, 6.1), which occurred on the Mexican subduction thrust in the Guerrero seismic gap. The two events were located near each other and SE of the area that had ruptured in an Mw 7.2 earthquake on 18 April 2014. Near-source recordings show that the rupture during the 8 May pro...
Article
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Plain Language Summary Devastation in central Mexico produced by the intermediate‐depth (magnitude 7.1) Puebla‐Morelos earthquake of 19 September 2017 has raised important questions about the seismic hazard in Mexico City, where more than 20 million people live. Probabilistic hazard in the city from intermediate‐depth and shallower subduction event...
Article
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On 8 September 2017, a great earthquake (Mw 8.2) took place in the Mexican subduction zone in the Tehuantepec gap, where no large subduction earthquakes have taken place since 1902. However, the 8 September earthquake did not occur on the contact between the Cocos and North American plates. The centroidal hypocentral depths reported by different ag...
Article
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In the wake of death and destruction left by the 2017 earthquake in Mexico City, it is natural to ask whether the event was unexpected and anomalous. Although such an intraslab earthquake (Mw 7.1; depth = 57 km; epicentral distance = 114 km from the city) was considered likely, the recordings in the city during the last 54 yrs reveal that the groun...
Article
Full-text available
The historical record of large subduction earthquakes in Guer- rero, Mexico, reveals the existence of an ∼230 km length seg- ment below the coast where no major rupture has occurred in the past 60 years. Reliable quantification of the hazard associated with such a seismic gap is urgently needed for risk mitigation purposes by means of state-of-the-...
Poster
Full-text available
First analysis ofthe 2001 Coyuca (Mexico) sequence, with relocation and preliminary Coulomb stress changes modeling.
Article
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Ground motions in Xalapa, Veracruz, Mexico, during the earthquake of January 4, 1920 ( M ~6.4), and three significant intraslab earthquakes ( M w 7.0) of the last century were estimated. These events are reasonable scenario earthquakes for Xalapa. Towards this goal, portable broadband seismographs at nine sites in the city and an additional one at...
Article
During the last century, earthquakes caused severe damage in Veracruz state, both in loss of life and property. The south-central zone of this entity, located along the Gulf of Mexico of this ∼750 km long entity, is of vital importance due to its population and industrial, port, and highway infrastructure. As has been observed in the past, this are...
Article
Full-text available
An efficient method to obtain a simple model of the slip distribution on a fault plane was developed from estimates of static offsets from continuous GPS measurements. Transfer functions were computed for the displacement due to a unit force on a fault plane (with a predetermined geometry, subdivided in a dense grid of subfaults) for all combinatio...
Article
La Comarca Minera de Hidalgo (México) es desde mayo de 2017 un Geoparque Mundial de la UNESCO; dicha denominación se justifica por un geopatrimonio de relevancia internacional que incluye: (a) el sistema epitermal (Ag‒Au) de clase mundial de Pachuca‒Real del Monte; (b) la localidad tipo de la tridimita y la cristobalita; (c) los basaltos con disyun...
Article
Full-text available
In the wake of death and destruction left by the 2017 earthquake in Mexico City, it is natural to ask whether the event was unexpected and anomalous. Although such an intraslab earthquake (M w 7.1; depth ˆ 57 km; epicentral distance = 114 km from the city) was considered likely, the recordings in the city during the last 54 yrs reveal that the grou...
Article
We analize an earthquake sequence which occurred 24 km NNW from Guadalajara Cathedral. The activity began on 15 December, 2015 with an Mw4.1 earthquake and resumed, again, on 11 May, 2016 when the largest earthquake of the sequence, Mw4.8, occurred. The earthquakes were recorded in the city by two accelerographs and at larger distances by broadband...
Article
Full-text available
A parameterized source and path effects inversion method based on the use of global optimization techniques is presented. We applied this method on velocity data from various seismic events collected between August, 2005 and April, 2007 in Mexico by the regional MesoAmerican Subduction Experiment (MASE) seismic network and other stations from the p...
Article
We explore the versatility of three parameters computed from recordings at station CU, located in Mexico City, ∼300–600 km from the trench, for quick detection (≤ 7 min after the origin time) of near-trench earthquakes for potential use in tsunami warning. The parameters are (1) ER, the ratio of total to high-frequency energy, (2) Sa 6, the pseudoa...
Article
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This work presents an innovative strategy to enhance the resolution of surface wave tomography obtained from ambient noise cross-correlation (C1) by bridging asynchronous seismic networks through the correlation of coda of correlations (C3). Rayleigh wave group dispersion curves show consistent results between synchronous and asynchronous stations....
Article
Full-text available
We relocated 52 events of 2.5 ≤ Mc ≤ 3.6 from a seismic sequence of over 250 events that occurred during July-December 2012 southwest of the Linares area, northeastern Mexico. To examine this swarm four seismic stations were installed in the region and operated during different time periods from September to December. Relocation of the swarm showed...
Article
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Two different ambient seismic noise techniques allow the determination of velocity models at Ijen caldera and Kawah Ijen volcano. At Ijen caldera, two average velocity models are constrained down to a depth of 3 km by inverting the stacked dispersion curve obtained by ambient noise cross-correlation. In addition, four local velocity models were obt...
Article
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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). A(max) exceeded 6 gal during 20 earthquakes at CU during this period. Of these, eight were intraslab events so that the ex...
Article
Full-text available
We determine here for the first time the geometry and location of the hydrothermal and magmatic reservoirs in the Lazufre volcanic area. This furthers the understanding of the origin of one of the largest worldwide volcanic uplift regions, both in space and amplitude. The exact locations and shapes of the sources generating a double-wide uplift reg...
Article
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We use group velocities from earthquake tomography together with group and phase velocities from ambient noise tomography (ANT) of Rayleigh waves to invert for the 3-D shear-wave velocity structure (5–70 km) of the Caribbean (CAR) and southern North American (NAM) plates. The lithospheric model proposed offers a complete image of the crust and uppe...
Article
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Detailed crustal imaging of western Michoacán and the Jalisco Block is obtained from ambient noise tomography. Results show a deep and well-delineated volcanic system below the Colima volcano complex, rooting up to ~ 22 km depth, with a shallow magmatic chamber constrained to the first ~ 7 km. A shallow low-velocity system to the south of the Chapa...
Article
Full-text available
We use group velocities from earthquake tomography together with group and phase velocities from ambient noise tomography (ANT) of Rayleigh-waves to invert for the 3-D shear-wave velocity structure (5–70 km) of the Caribbean (CAR) and southern North American (NAM) plates. The lithospheric model proposed offers a complete image of the crust and uppe...
Article
Prediction of ground motion in Mexico City from postulated earthquakes in the central trans‐Mexican volcanic belt (CTMVB) is clearly important in the estimation of seismic risk. Unfortunately, moderate seismicity and sparse seismic network in the region makes the task difficult. Few useful recordings of CTMVB earthquakes are available in the near‐s...
Article
Full-text available
We introduce a method for imaging the earthquake source dynamics from the inversion of ground-motion records based on a parallel genetic algorithm. The source model follows an elliptical patch approach and uses the staggered-grid split-node method to simulate the earthquake dynamics. A statistical analysis is used to estimate errors in both inverte...
Article
Full-text available
Normal‐faulting intraslab earthquakes in the subducted Cocos plate occur as close as 112 km from Mexico City at depths of ∼50–55 km (Fig. 1). The incident wavefield in the Valley of Mexico from these earthquakes is dominated by body waves (Furumura and Singh, 2002). The stress drops of these earthquakes are relatively large (Garcia et al. , 2004)....
Article
Full-text available
In this study seismic noise records from the permanent broadband network of the Mexican National Seismological Service (Servicio Sismológico Nacional) and from the temporal broadband networks of MASE and VEOX have been used to compute the Green functions from vertical-vertical component of noise cross correlations between station pairs. MASE (Mesoa...
Article
Full-text available
The southwestern corner of the Gulf of Mexico (around the Isthmus of Tehuantepec) is exposed to intense deep (> 100 km) seismic activity caused by the subduction of the Cocos Plate. Aside from this, the gulf has been considered a zone of low or no-seismicity. However, a sparse shallow seismic activity is observed across the Gulf of Mexico, even in...
Article
Full-text available
The southwestern corner of the Gulf of Mexico (around the Isthmus of Tehuantepec) is exposed to intense deep (>100 km) seismic activity caused by the subduction of the Cocos Plate. Aside from this, the gulf has been considered a zone of low or no-seismicity. However, a sparse shallow seismic activity is observed across the Gulf of Mexico, even in t...
Article
Full-text available
Though the Delhi earthquake of 27 August 1960 is important in understanding seismic hazard to the city, there is an uncertainty associated with its reported epicentre, depth and magnitude. The reported epicentres given in different catalogues are not consistent with felt and damage reports, and the depths (58–109 km) are also inconsistent with reco...
Article
Full-text available
Online Material: Color figures; synthetic‐data links. The devastating tsunami produced by the Sumatra–Andaman earthquake ( M w 9.2) of 24 December 2004 heightened the interest of the scientific community in tsunami early warning systems. Global efforts have been successful in achieving a robust ocean basin‐wide tsunami warning in which there is en...
Article
Full-text available
The recent great earthquakes of 26 December 2004 (Sumatra, Indonesia, Mw 9.2), 26 February 2010 (Maule, Chile, Mw 8.8), and 11 March 2011 (Tohoku-oki, Japan, Mw 9.0) have once again brought to the forefront the urgent need for early tsunami warning. These warnings mostly rely on magnitude and location of an earthquake. A large/great magnitude subdu...
Article
Aiming to obtain some information about the rupture process of intermediate to great earthquakes, many waveform inversion schemes have been proposed. Usual methods involve several subfaults on the fault plane to obtain a detailed image of the kinematic rupture process. On the other hand, it has been questioned the resolution over obtained paramters...
Article
Full-text available
We analyze an earthquake sequence of seven small events (2.5<Mw<3.0) which occurred in Morelia, Mexico during a 33-hour period in October, 2007 and was recorded by two local stations. Morelia lies in Central Trans-Mexican Volcanic Belt (CTMVB). The waveforms and spectra of the events are surprising similar, suggesting that their locations and focal...
Article
Using continuous seismic data from newly available broadband stations in Mexico and Central America we have obtained group and phase velocity maps of fundamental mode Rayleigh wave for the region. These new maps have been calculated for periods between 8 and 60 s from cross-correlations of seismic ambient noise between 100 broadband stations, and s...
Conference Paper
Full-text available
The Guerrero segment of the Mexican subduction zone has not experienced a large earthquake for almost 100 years (Singh et al., 1981). Due to its proximity to Mexico City, which was devastated by an earthquake in the more distant Michoacan segment in 1985, it has been studied extensively in recent years. Silent slip events have been observed by a lo...
Article
We test the feasibility of rapid estimation of rupture length, location of surface projection of the downdip edge of the rupture with respect to the coast, and Mw of large/great subduction thrust earthquakes, using near-source, coseismic static displacement vectors of coastal GPS stations, adjacent to the trenches. An a priori rough knowledge of ge...
Article
The Acambay earthquake of 1912 (M similar to 7: 0), which occurred in the central Trans-Mexican Volcanic Belt (CTMVB) about 100 km west-northwest of Mexico City, has been thought to be a critical scenario event in the estimation of seismic hazard of the city. We use seismograms of two small earthquakes located near Actopan (15 December 2003; 18 May...
Article
Full-text available
Receiver functions (RFs) from two permanent stations (CUIG and ZAIG) of the Mexican broadband network were calculated to infer the crustal structure at both sites. The data were stacked to allow uncertainty estimations and inverted using two global optimization algorithms: simulated annealing and genetic algorithms. Strong and systematic azimuthal...
Article
The Colombia - Ecuador trench is located on the northwestern subduction zone along the Nazca and South America plate boundary. The zone is considered tectonically complex and it is continuously under large crustal deformation. The rapid convergence rate (58mm/a) in the zone caused a series of four large earthquakes (Mw>7.5) in the 20th century: 190...
Article
Full-text available
Previous tomographic models for Mexico and surrounding regions based on surface waves have been obtained either for small local regions or are part of continental-scale or global studies. We present here the results of high-resolution Rayleigh and Love wave tomography for the entire Mexican territory and vicinity from correlations of seismic ambien...
Article
Full-text available
Two types of intraslab earthquakes in the subducted Cocos plate occur below Guerrero, Mexico, and adjacent areas: (A) steeply-dipping thrust earthquakes, and (B) normal-faulting earthquakes. Type A events are located similar to 10-35 km from the coast at a depth of similar to 35 km and reveal down-dip compression in the slab, most probably a conseq...
Article
Full-text available
Two types of intraslab earthquakes in the subducted Cocos plate occur below Guerrero, Mexico, and adjacent areas: (A) steeply-dipping thrust earthquakes, and (B) normal-faulting earthquakes. Type A events are located ~10-35 km from the coast at a depth of ~35 km and reveal down-dip compression in the slab, most probably a consequence of unbending o...
Article
Full-text available
Shear wave velocity of the crust below central Mexico is estimated using surface wave dispersion measurements from regional earthquakes recorded on a dense, 500 km long linear seismic network. Vertical components of regional records from 90 well-located earthquakes were used to compute Rayleigh-wave group-velocity dispersion curves. A tomographic i...
Article
As a part of the MesoAmerican Subduction Experiment (MASE), a seismic campaign consisting of 100 broadband seismometers was deployed in South Central Mexico for about two years (2005-2006). Stations were located along a line of ~500 km with an inter-station distance of ~ 5km. By using well located regional earthquakes, a surface wave tomography for...