dor_id: 4102215

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561.#.#.u: http://www.geofisica.unam.mx/

650.#.4.x: Físico Matemáticas y Ciencias de la Tierra

336.#.#.b: info:eu-repo/semantics/article

336.#.#.3: Artículo de Investigación

336.#.#.a: Artículo

351.#.#.6: http://revistagi.geofisica.unam.mx/index.php/RGI

351.#.#.b: Geofísica Internacional

351.#.#.a: Artículos

harvesting_group: RevistasUNAM

270.1.#.p: Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

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270.1.#.d: México

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883.#.#.u: http://www.revistas.unam.mx/front/

883.#.#.a: Revistas UNAM

590.#.#.a: Coordinación de Difusión Cultural

883.#.#.1: https://www.publicaciones.unam.mx/

883.#.#.q: Dirección General de Publicaciones y Fomento Editorial, UNAM

850.#.#.a: Universidad Nacional Autónoma de México

856.4.0.u: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/2091/1757

100.1.#.a: Esparza, Alfredo; Arzate, Jorge; Timmen, Ludger; Silliker, Jason; Schilling, Manuel

524.#.#.a: Esparza, Alfredo, et al. (2020). High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes. Geofísica Internacional; Vol. 59 No. 3, 2020; 155-168. Recuperado de https://repositorio.unam.mx/contenidos/4102215

245.1.0.a: High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 2020

264.#.1.c: 2020-07-01

653.#.#.a: g-Absoluta; comparación internacional; desplazamientos verticales; Bloque de Jalisco; subducción asísmica; Absolute gravity; international comparison; vertical displacements; Jalisco Block; aseismic subduction

506.1.#.a: La titularidad de los derechos patrimoniales de esta obra pertenece a las instituciones editoras. Su uso se rige por una licencia Creative Commons BY-NC-ND 4.0 Internacional, https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es, fecha de asignación de la licencia 2020-07-01, para un uso diferente consultar al responsable jurídico del repositorio por medio de revistagi@igeofisica.unam.mx

884.#.#.k: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/2091

001.#.#.#: oai:ojs.ojs.geofisica.unam.mx:article/2091

041.#.7.h: eng

520.3.#.a: We report the results of 16 Absolute Gravity (AG) measurements distributed central and western Mexico employing two free-fall gravity instruments; the FG5X-220 of Leibniz Universität Hannover (LUH), and the FG5X-252 instrument of the Centro Nacional de Metrología (CENAM). Previous to the setup of new stations and acquisition campaigns, the FG5X-252 was certified in two steps, first a mutual comparison with the reference gravimeter FG5X-220, which have a long range stability below 2 µGal, and later through an international comparison at NOAA´s Table Mountain, Col. facilities with 13 other instruments of different countries. The acquisition campaigns in the Jalisco Block (JB) took place during the dry season of 2016 and 2018, which included AG stations in Chamela (CHA), Guadalajara (AGG), Manzanillo (MAN), Puerto Vallarta (UGP), and Tepic (TEP); the later established new reference station in the north of the JB in 2016. The results obtained from the 2016 and 2018 field campaigns in the JB were compared with 1996 AG data acquired by NOAA at the same sites established. The observed vertical displacements in the two years period at stations CHA (+22.7 cm), UGG (+44.3 cm) and MAN (+54.6 cm) overcomes substantially the annual average (2.8 cm, 4.2 cm y 3.6 cm respectively) from the difference of the AG measurements 2016-1996. In the same period the UGP station subsided 8.5 cm, while station TEP remained quite stable (-0.25). In September 2017 two large earthquakes of magnitudes 8.2 and 7.1 occurred in the coast of Chiapas (07/Nov/2017) and in the State of Puebla (19/Nov/2017), which were recorded at some of the UNAVCO´s GPS stations, namely MAN, UGG and CHA even though the nearest seismic source was located more than 500 km to the east. The analysis of our results in combination with other geophysical data support the hypothesis that the earthquake with epicenter in Puebla triggered the aseismic subduction of a segment of the Ribera Plate (RP), which in turn uplifted the stations above mentioned. We conclude that the aseismic subduction in this region is facilitated by a wet oceanic crust that carries important amounts of marine sediments, producing a lubricated interface between oceanic RP and the overriding JP.

773.1.#.t: Geofísica Internacional; Vol. 59 No. 3 (2020); 155-168

773.1.#.o: http://revistagi.geofisica.unam.mx/index.php/RGI

046.#.#.j: 2020-10-20 00:00:00.000000

022.#.#.a: 0016-7169

310.#.#.a: Trimestral

264.#.1.b: Instituto de Geofísica, UNAM

758.#.#.1: http://revistagi.geofisica.unam.mx/index.php/RGI

handle: 009405a7ddceaa45

harvesting_date: 2020-09-23 00:00:00.0

856.#.0.q: application/pdf

file_modification_date: 2020-09-17 20:30:12.0

last_modified: 2020-10-21 00:00:00

license_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es

license_type: by-nc-nd

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Artículo

High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes

Esparza, Alfredo; Arzate, Jorge; Timmen, Ludger; Silliker, Jason; Schilling, Manuel

Instituto de Geofísica, UNAM, publicado en Geofísica Internacional, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Instituto de Geofísica, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Esparza, Alfredo, et al. (2020). High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes. Geofísica Internacional; Vol. 59 No. 3, 2020; 155-168. Recuperado de https://repositorio.unam.mx/contenidos/4102215

Descripción del recurso

Autor(es)
Esparza, Alfredo; Arzate, Jorge; Timmen, Ludger; Silliker, Jason; Schilling, Manuel
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
High precision measurements of Absolute Gravity in México: the Jalisco Block changes in gravity triggered by distant earthquakes
Fecha
2020-07-01
Resumen
We report the results of 16 Absolute Gravity (AG) measurements distributed central and western Mexico employing two free-fall gravity instruments; the FG5X-220 of Leibniz Universität Hannover (LUH), and the FG5X-252 instrument of the Centro Nacional de Metrología (CENAM). Previous to the setup of new stations and acquisition campaigns, the FG5X-252 was certified in two steps, first a mutual comparison with the reference gravimeter FG5X-220, which have a long range stability below 2 µGal, and later through an international comparison at NOAA´s Table Mountain, Col. facilities with 13 other instruments of different countries. The acquisition campaigns in the Jalisco Block (JB) took place during the dry season of 2016 and 2018, which included AG stations in Chamela (CHA), Guadalajara (AGG), Manzanillo (MAN), Puerto Vallarta (UGP), and Tepic (TEP); the later established new reference station in the north of the JB in 2016. The results obtained from the 2016 and 2018 field campaigns in the JB were compared with 1996 AG data acquired by NOAA at the same sites established. The observed vertical displacements in the two years period at stations CHA (+22.7 cm), UGG (+44.3 cm) and MAN (+54.6 cm) overcomes substantially the annual average (2.8 cm, 4.2 cm y 3.6 cm respectively) from the difference of the AG measurements 2016-1996. In the same period the UGP station subsided 8.5 cm, while station TEP remained quite stable (-0.25). In September 2017 two large earthquakes of magnitudes 8.2 and 7.1 occurred in the coast of Chiapas (07/Nov/2017) and in the State of Puebla (19/Nov/2017), which were recorded at some of the UNAVCO´s GPS stations, namely MAN, UGG and CHA even though the nearest seismic source was located more than 500 km to the east. The analysis of our results in combination with other geophysical data support the hypothesis that the earthquake with epicenter in Puebla triggered the aseismic subduction of a segment of the Ribera Plate (RP), which in turn uplifted the stations above mentioned. We conclude that the aseismic subduction in this region is facilitated by a wet oceanic crust that carries important amounts of marine sediments, producing a lubricated interface between oceanic RP and the overriding JP.
Tema
g-Absoluta; comparación internacional; desplazamientos verticales; Bloque de Jalisco; subducción asísmica; Absolute gravity; international comparison; vertical displacements; Jalisco Block; aseismic subduction
Idioma
eng
ISSN
0016-7169

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