Crustal imaging of western Michoacán and the Jalisco Block, Mexico, from Ambient Seismic Noise

Spica, Zack; Cruz‐Atienza, V. M.; Reyes-Alfaro, Gabriel; Legrand, D.; Iglesias, A.

doi:10.1016/j.jvolgeores.2014.11.005

Cited by 23 publications

(14 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure shows our interpretation of interactions between the Mexican subduction zone and slow earthquake characteristics. The slab dips steeply and is warmer in Jalisco, with a mantle wedge corner below 30 km (Spica et al, ), yielding a tremor area of small width with shallow tremors that are strongly sensitive to tide, and very small SSEs. In Guerrero, the slab is flat, colder, and has an extended mantle wedge corner.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Variations in Slow Earthquakes Along the Mexican Subduction Zone

et al. 2018

View full text Add to dashboard Cite

Slow earthquakes in Mexico have been investigated independently in different areas. Here we review differences in tremor behavior and slow slip events along the entire subduction zone to improve our understanding of its segmentation. Some similarities are observed between the Guerrero and Oaxaca areas. By combining our improved tremor detection capabilities with previous results, we suggest that there is no gap in tremor between Guerrero and Oaxaca. However, some differences between Michoacan and Guerrero are seen (e.g., SSE magnitude, tremor zone width, and tremor rate), suggesting that these two areas behave differently. Tremor initiation shows clear tidal sensitivity along the entire subduction zone. Tremor in Guerrero is sensitive to small tidal normal stress as well as shear stress, suggesting that the subduction plane may include local variations in dip. Estimation of the energy rate shows similar values along the subduction zone interface. The scaled tremor energy estimates are similar to those calculated in Nankai and Cascadia, suggesting a common mechanism. Along‐strike differences in slow deformation may be related to variations in the subduction interface that yield different geometrical and temperature profiles.

show abstract

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Variations in Slow Earthquakes Along the Mexican Subduction Zone

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Seismic tomography (Spica et al, 2017) highlights a 15 km deep low-velocity body (LVB) which was interpreted as a deep magmatic reservoir. It is confined within the CR, suggesting a structural control of the normal fault system on it (Spica et al, 2014). The LVB has an extent of ca.…”

Section: The Cvc Plumbing Systemmentioning

confidence: 99%

Analysing stress field conditions of the Colima Volcanic Complex (Mexico) by integrating finite-element modelling (FEM) simulations and geological data

et al. 2020

View full text Add to dashboard Cite

Abstract. In recent decades, finite-element modelling (FEM) has become a very popular tool in volcanological studies and has even been used to describe complex system geometries by accounting for multiple reservoirs, topography, and heterogeneous distribution of host rock mechanical properties. In spite of this, the influence of geological information on numerical simulations is still poorly considered. In this work, 2D FEM of the Colima Volcanic Complex (Mexico) is provided by using the Linear Static Analysis (LISA) software in order to investigate the stress field conditions with increasingly detailed geological data. By integrating the published geophysical, volcanological, and petrological data, we modelled the stress field considering either one or two magma chambers connected to the surface via dykes or isolated (not connected) in the elastic host rocks (considered homogeneous and non-homogeneous). We also introduced tectonic disturbance, considering the effects of direct faults bordering the Colima Rift and imposing an extensional far-field stress of 5 MPa. We ran the model using the gravity in calculations. Our results suggest that an appropriate set of geological data is of pivotal importance for obtaining reliable numerical outputs, which can be considered a proxy for natural systems. Beside and beyond the importance of geological data in FEM simulations, the model runs using the complex feeding system geometry and tectonics show how the present-day Colima volcanic system can be considered in equilibrium from a stress state point of view, in agreement with the long-lasting open conduit dynamics that have lasted since 1913.

show abstract

“…To obtain dispersion curves, we follow the standard procedure proposed by Bensen et al (2007). Data from pairs of inland broadband stations (BB-BB) provide dispersion curves from ∼1 to 50 s depending on the interstation distances (e.g., Spica et al, 2014).…”

Section: Crustal Tomography Resolutionmentioning

confidence: 99%

“…Individual dispersion curves for each pair of station-station and/or earthquakestation can be inverted in a tomographic sense using the fastmarching method developed by Rawlinson and Sambridge (2005). See Iglesias et al (2010) and Spica et al (2014) for details.…”

Section: Crustal Tomography Resolutionmentioning

confidence: 99%

A Seismogeodetic Amphibious Network in the Guerrero Seismic Gap, Mexico

Cruz‐Atienza

Ito

Kostoglodov

et al. 2018

Seismological Research Letters

Self Cite

View full text Add to dashboard Cite

The historical record of large subduction earthquakes in Guerrero, Mexico, reveals the existence of an ∼230 km length segment 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-art observations and modeling. In this article, we introduce and quantitatively assess the first seismogeodetic amphibious network deployed in Mexican and Central American soils that will provide the opportunity to achieve this goal in the near future. Deployed in 2017, the network is the result of a collaborative effort between Mexican and Japanese scientists. It consists of 15 onshore broadband and 7 ocean-bottom seismometers, 33 Global Positioning System (GPS) stations, 7 ocean-bottom pressure gauges, and 2 GPSacoustic sites, most of them installed within the Guerrero seismic gap. Initial data from the network revealed the occurrence of a 6-month-long slow-slip event in Guerrero, starting in May and ending in October 2017. To illustrate the performance of the various instruments, we also present the first ocean-bottom pressure and GPS-acoustic measurements in Mexico; the latter was obtained by means of an autonomous Wave Glider vehicle. The ground motion of the devastating 19 September 2017 M w 7.1 earthquake in central Mexico is presented as well. Nominal resolution of the seismogeodetic network is estimated through different synthetic inversion tests for tomographic imaging and the seismic coupling (or slow-slip) determination on the plate interface. The tests show that combined onshore and offshore instruments should lead to unprecedented results regarding the seismic potential (i.e., interface coupling) of the seismic gap and the Earth structure from the Middle America trench up to 70-km depth across the Guerrero state.

show abstract

Crustal imaging of western Michoacán and the Jalisco Block, Mexico, from Ambient Seismic Noise

Cited by 23 publications

References 49 publications

Spatiotemporal Variations in Slow Earthquakes Along the Mexican Subduction Zone

Spatiotemporal Variations in Slow Earthquakes Along the Mexican Subduction Zone

Analysing stress field conditions of the Colima Volcanic Complex (Mexico) by integrating finite-element modelling (FEM) simulations and geological data

A Seismogeodetic Amphibious Network in the Guerrero Seismic Gap, Mexico

Contact Info

Product

Resources

About