Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico

Rebollar, Cecilio J.; Espíndola, Víctor Hugo; Mendoza, Antonio; Pérez-Vertti, Arturo

doi:10.22201/igeof.00167169p.1999.38.2.386

Cited by 36 publications

(2 citation statements)

References 29 publications

(37 reference statements)

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“…Similarly, there are local and regional moment tensors catalogs with lower threshold magnitudes (3.5 < MW < 4.5). Some other online databases, such as the focal mechanism bulletin of the International Seismological Centre (ISC) In virtue of the relevant seismic hazard in the region and its importance from the geodynamical perspective, many authors have computed the fault plane solutions of seismic events using different data and several techniques (e.g., Molnar and Sykes, 1969;Dean and Drake, 1978;Chael and Stewart, 1982;LeFevre and McNally, 1985;Goff et al, 1987;Guzmán-Speziale et al, 1989;Pacheco et al, 1993;Pardo and Suárez, 1993;Pardo and Suárez, 1995;Quintanar et al, 1999;Rebollar et al, 1999;Quintanar et al, 2004;Rodríguez-Lozoya et al, 2008;Pacheco and Singh, 2010;Sumy et al, 2013;Dougherty and Clayton, 2014;Abbott and Brudzinski, 2015;Rodríguez-Pérez and Singh, 2016;Huesca-Pérez et al, 2022). National and International observatories also provide fault plane solutions for seismic events generated in the territory of Mexico (e.g., the Mexican Seismological Service, SSN;…”

Section: Introductionmentioning

confidence: 99%

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

Rodríguez-Pérez

Zúñiga²

2023

Preprint

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Abstract. We present a focal mechanism catalog for earthquakes that occurred in Mexico and surrounding areas reported from February 1928 to July 2022. The magnitude of the events varies from -0.9 to 8.2. The hypocentral depth is in the range of 0 < Z < 270 km. Focal mechanisms in this catalog are associated with tectonic, geothermal, and volcanic environments. Reported fault plane solutions were derived using different types of data at local, regional, and teleseismic distances and different methods such as first motions, composite solutions, waveform analysis, and moment tensor inversion. So far, focal mechanism data for earthquakes in Mexico, were dispersed over many publications without any link among them. For this reason, we collected and revised focal mechanism solutions previously reported by different agencies and studies from published sources. Our catalog consists of 5701 fault plane solutions, and we report all the available focal mechanisms obtained by different authors and seismological agencies for each seismic event. Additionally, we classified the fault type into seven types: normal (N), normal – strike-slip (N-SS), strike-slip – normal (SS-N), strike-slip (SS), strike-slip – reverse (SS-R), reverse – strike-slip (R-SS), and reverse (R) providing some preliminary statistics results. We used the ternary diagrams of Kaverina-type classification to verify the rupture type of focal mechanism data. We also provide a classification of the quality of the focal mechanism data into three categories: A, B, and C. A represents good/reliable data, B represents regular, and C represents poor/questionable data according to a well-defined criterion. Our intention is to provide a comprehensive compilation of focal mechanism data which can help in future source and tectonic studies in Mexico. The earthquake focal mechanism catalog (https://figshare.com/articles/dataset/Earthquake_focal_mechanism_catalog_for_Mexico/21663668; Rodríguez-Pérez and Zúñiga, 2022) is given as the Supplement of this paper.

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Section: Introductionmentioning

confidence: 99%

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

Rodríguez-Pérez

Zúñiga²

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In light of the relevant seismic hazard in the region and its importance from the geodynamical perspective, many authors have computed the focal mechanisms of seismic events using different data and several techniques (e.g., Molnar and Sykes, 1969;Dean and Drake, 1978;Chael and Stewart, 1982;LeFevre and McNally, 1985;Goff et al, 1987;Doser and Rodriguez, 1993;Pacheco et al, 1993;Pardo and Suárez, 1993;Pardo and Suárez, 1995;Quintanar et al, 1999;Rebollar et al, 1999;Quintanar et al, 2004;Rodríguez-Lozoya et al, 2008;Ortega and Quintanar, 2010;Pacheco and Singh, 2010;Sumy et al, 2013;Dougherty and Clayton, 2014;Abbott and Brudzinski, 2015;Rodríguez-Pérez and Singh, 2016;Huesca-Pérez et al, 2022). National and international observatories also provide focal mechanism solutions for seismic events generated in the territory of Mexico (e.g., the Mexican Seismological Service, SSN; the Southern California Seismic Network, SCSN; U.S. Geological Survey, USGS).…”

Section: Introductionmentioning

confidence: 99%

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

Rodríguez-Pérez,

Zúñiga

2023

Earth Syst. Sci. Data

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Abstract. We present a focal mechanism catalog for earthquakes that occurred in Mexico and surrounding areas reported from February 1928 to July 2022. The magnitude of the events varies from −0.9 to 8.2. The hypocentral depth is in the range of 0 < Z < 270 km. Focal mechanisms in this catalog are associated with tectonic, geothermal, and volcanic environments. Reported focal mechanisms were derived using different types of data at local, regional, and teleseismic distances and different methods such as first motions, composite solutions, waveform analysis, and moment tensor inversion. So far, focal mechanism data for earthquakes in Mexico are dispersed over many publications without any link among them. For this reason, we collect and revise focal mechanism solutions previously reported by different agencies and studies from published sources. Our catalog consists of 7664 focal mechanism solutions for a total of 5701 events since we report all the available focal mechanisms obtained by different authors and seismological agencies for each seismic event. Additionally, we classify the focal mechanisms according to their fault types using the ternary diagrams of Kaverina-type classification. We also rank the quality of the focal mechanism data into three categories: A, B, and C. A represents good/reliable data, B represents satisfactory data, and C represents poor/questionable data according to well-defined criteria. The main goal of this study is to provide a comprehensive compilation of focal mechanism data that can help in future source and tectonic studies in Mexico. The earthquake focal mechanism catalog described in this article is available at https://doi.org/10.6084/M9.FIGSHARE.21663668.V1 (Rodríguez-Pérez and Zúñiga, 2022).

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Evidence of an upper mantle seismic anomaly opposing theCocos slab beneath theIsthmus ofTehuantepec,Mexico

Kim

Lim

Miller

et al. 2014

Geochem Geophys Geosyst

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Subduction of the Cocos plate beneath southern Mexico is characterized by several unusual features, such as a discontinuous volcanic arc, unusual arc chemistry, and anomalously low topography of Tehuantepec Isthmus. Recent seismic images from both receiver functions and seismic tomography suggest that there may be an additional, opposing structure dipping to the southwest from the Gulf of Mexico, and these images have been previously explained by a southwest-dipping slab. However, standard models of the Caribbean tectonic history do not support this interpretation. To better define the Cocos slab's structure and the possible existence of a structure dipping in the opposite direction, dense seismic data across southern Mexico are used to form high-resolution seismic images, based on the 2-D generalized radon transform method, and to relocate regional earthquakes. Our images show the Cocos plate dipping at 30 to the northeast encounters the anomaly that is dipping in the opposite sense at 150 km depth. Relocated seismicity clearly delineates a Wadati-Benioff zone that marks the subducting Cocos plate. A cluster of seismicity also appears at 150 km depth which may be related to the subduction of the Tehuantepec ridge and/or to the imaged seismic structure with opposite polarity.

show abstract

Distributions of stresses and geometry of the Wadati-Benioff zone under Chiapas, Mexico

Cited by 36 publications

References 29 publications

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

An earthquake focal mechanism catalog for source and tectonic studies in Mexico from February 1928 to July 2022

Evidence of an upper mantle seismic anomaly opposing theCocos slab beneath theIsthmus ofTehuantepec,Mexico

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