The Mexican National Seismological Service: An Overview

Pérez‐Campos, Xyoli; Espíndola, Víctor Hugo; Pérez, Jorge Luis Tórtora; Estrada, Jorge Arrese; Monroy, Caridad Cárdenas; Bello, D.; González-López, A.; Ávila, Daniel; Esparza, Moisés Gerardo Contreras Ruiz; Maldonado, Rosa María Martínez; Tan, Yi; Rasilla, Iván Rodríguez; Rosas, Miguel Ángel Vela; Cruz, Juan Carlos; Cárdenas, Arturo; Estrada, Fernando Navarro; Hurtado, A.; Carvajal, Antonio de Jesús Mendoza; Montoya-Quintanar, E.; Pérez‐Velázquez, Miguel A.

doi:10.1785/0220170186

Cited by 31 publications

(10 citation statements)

References 9 publications

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“…For a detailed description of the stations involved in this study refer to Table S1 in the supporting information. The reader is also referred to Pérez‐Campos et al () and Córdoba‐Montiel et al () for a summary of the permanent stations in this area.…”

Section: Methodsmentioning

confidence: 99%

Imaging the Eastern Trans‐Mexican Volcanic Belt With Ambient Seismic Noise: Evidence for a Slab Tear

2018

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The eastern sector of the Trans‐Mexican Volcanic Belt (TMVB) is an enigmatic narrow zone that lies just above where the Cocos plate displays a sharp transition in dipping angle in central Mexico. Current plate models indicate that the transition from flat to steeper subduction is continuous through this region, but the abrupt end of the TMVB suggests that the difference in subduction styles is more likely to be accommodated by a slab tear. Based on a high‐resolution shear wave velocity and radial anisotropy model of the region, we argue that a slab tear within South Cocos can explain the abrupt end of the TMVB. We also quantify the azimuthal anisotropy beneath each seismic station and present a well‐defined flow pattern that shows how mantle material is being displaced from beneath the slab to the mantle wedge through the tear in the subducted Cocos plate. We suggest that the toroidal mantle flow formed around the slab edges is responsible for the existence of the volcanic gap in central Mexico. Moreover, we propose that the temperature increase caused by the influx of hot, less dense mantle material flowing through the tear to the Veracruz area may have significant implications for the thermomechanical state of the subducted slab and explain why the intermediate‐depth seismicity ends suddenly at the southern boundary of the Veracruz basin. The composite mantle flow formed by the movement of mantle material through the slab tears in western and southern Mexico may be allowing the Cocos plate to roll back in segments.

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Section: Methodsmentioning

confidence: 99%

Imaging the Eastern Trans‐Mexican Volcanic Belt With Ambient Seismic Noise: Evidence for a Slab Tear

2018

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“…D s t index data were obtained from Data Analysis Center for Geomagnetism and Space Magnetism, Kyoto University (http://wdc.kugi.kyoto-u.ac.jp). The calculations of the local TEC values are partly based on GPS data provided by the Servicio Sismológico Nacional (SSN, ; Pérez‐Campos et al, ) and the Trans‐boundary, Land and Atmosphere Long‐term Observational and Collaborative Network (TLALOCNet; Cabral‐Cano et al, ) and SSN‐TLALOCNet operated by the Servicio de Geodesia Satelital (SGS) and SSN at the Instituto de Geofísica‐Universidad Nacional Autónoma de México (UNAM) and UNAVCO Inc. We gratefully acknowledge all the personnel from SSN, SGS, and UNAVCO Inc. for station maintenance, data acquisition, IT support, and data distribution for these networks. TLALOCNet, SSN‐TLALOCNet, and related SGS operations are supported by the National Science Foundation EAR‐1338091, NASA‐ROSES NNX12AQ08G, CONACyT projects 253760, 256012, and 2017‐01‐5955, DGAPA‐PAPIIT projects IN104213, IN111509, IN109315‐3, and IN104818‐3, and supplemental support from UNAM‐Instituto de Geofísica and Centro de Ciencias de la Atmosfera.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

et al. 2018

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In the interval of 4–10 September 2017, the Sun presented multiple solar flares from active region AR 2673. There were also coronal mass ejections that interacted with the Earth's magnetosphere. This solar activity produced several space weather events. These events were observed with ground‐based instruments of the Mexican Space Weather Service. The Mexican Array RadioTelescope detected highly perturbed solar transits associated with Type I radio emissions from active regions. The Compact Astronomical Low‐frequency, Low‐cost Instrument for Spectroscopy in Transportable Observatories‐Mexican Array RadioTelescope station detected several radio bursts including a Type III associated with the X8.2 flare on 10 September. The magnetometer detected variations reaching a regional K index of 8.3 during the geomagnetic storm. The ionosphere over Mexico was disturbed by different space weather phenomena with the dominant effects of the geomagnetic storm. We used total electron content data to study latitudinal and longitudinal ionospheric effects in this interval. The cosmic rays monitor detected a Forbush decrease associated also with the geomagnetic storm. This low‐latitude instrumental network in Mexico allowed estimating the regional response to space weather events. Coincidentally with the space weather events referred above, there were also two other types of natural hazards affecting the country at that moment, the hurricane Katia category 2 in the Gulf of Mexico, and two major earthquakes (7 and 19 September 2018). The conjunction of these natural phenomena were close to creating a worst‐case scenario in terms of civil protection reaction.

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“…They are however unable to capture a full cycle of the largest Mexican SSEs: none of the individual temporary networks have continuously recorded a full 4‐year SSE cycle, let alone multiple cycles. The Mexican National Seismological Service (SSN = Servicio Sismológico Nacional) has maintained a network for more than 100 years, but only more recently has the continuous broadband data been archived (Pérez‐Campos et al, ). Figure shows the starting date from when those data were available.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Tectonic Tremor Activity Observed Over Multiple Slow Slip Cycles in the Mexican Subduction Zone

et al. 2019

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We develop a single-station tremor spectrum template detection method that we applied to continuous seismic data recorded by the Mexican National Seismological Service broadband stations. This allows for an unprecedented long-term analysis of tectonic tremor in Mexico over multiple slow slip events (SSEs). We only detect tremor that are within previously discovered tremor regions, thereby extending the catalog in time but not space. The resulting catalog demonstrates the strong correlation of bursts of tremor activity and aseismic slip over multiple slow slip cycles. The M~7 long-term SSEs in the states of Guerrero and Oaxaca are associated with the longest sequences of tremor bursts. Each of these tremor bursts are made up of a series of smaller bursts. In between the large M7 SSEs, there are shorter-duration, isolated tremor bursts. In Guerrero, these shorter bursts were found to accompany M~6 short-term SSEs. The occurrence of these short-duration tremor bursts in Oaxaca demonstrates that small short-term SSEs occur in both major slow slip regions in Mexico. The discrete range of tremor burst sizes and rates suggests that slow slip events in the Mexican subduction zone are organized into characteristic moment and moment rates. The catalog also reveals other aseismic transients, such as postseismic slip in Oaxaca after the 16 February 2018 M w 7.2 Pinotepa Nacional earthquake. We highlight that such long-term catalogs are a useful tool together with geodetic observations to monitor slow slip activity that potentially plays a role in the subduction megathrust cycle.

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The Mexican National Seismological Service: An Overview

Cited by 31 publications

References 9 publications

Imaging the Eastern Trans‐Mexican Volcanic Belt With Ambient Seismic Noise: Evidence for a Slab Tear

Imaging the Eastern Trans‐Mexican Volcanic Belt With Ambient Seismic Noise: Evidence for a Slab Tear

Space Weather Events, Hurricanes, and Earthquakes in Mexico in September 2017

Characteristic Tectonic Tremor Activity Observed Over Multiple Slow Slip Cycles in the Mexican Subduction Zone

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