Tectonic Analysis of the Southern of María Cleofas Island from Bathymetric and Seismic Data

Cruz, Juan Luis Carrillo‐de la; Núñez, Diana; Escalona-Alcázar, Felipe de Jesús; Núñez-Cornũ, F. J.; González‐Fernández, Antonio; Córdoba, Diego; Dañobeitia, Juan José

doi:10.1785/0220180398

Cited by 5 publications

(7 citation statements)

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“…To the NW of the Middle America trench, the only bathymetric expression of the contact between RP and NAP is the Islas Marías Escarpment. The Islas Marías Escarpment is a normal fault reported in its southern part by Carrillo-de la Cruz et al (2019). Some authors establish the location of the active subduction west of our profile at ca.…”

Section: Discussionmentioning

confidence: 53%

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

et al. 2021

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The tectonic interaction between the Rivera and North American plates north of the Bahía de Banderas is poorly understood. The nature of the crust and where the subduction ends in the western part of the Islas Marias Archipelago are still controversial. Based on new geophysical data provided by the TsuJal project, we present the shallow and deep crustal structure of the Rivera–North American plate contact zone along two seismic transects, TS09b and RTSIM01b, and the bathymetry obtained across the northern region of María Madre Island. Detailed bathymetric analysis allowed mapping of a series of lineaments along the study region, with two main preferred tendencies (020–050° and 290–320°) associated with the evolution of the Pacific-Rivera rise and the transform faults of the Gulf of California, respectively. The shallow structure is characterized by five sedimentary basins without deformation, whose horizons are subparallel, suggesting that the sediment deposition occurred after the extension process ended. The deep structure corresponds to a transition between oceanic crust (Rivera Plate), with an average thickness of ∼10 km to the Islas Marías Escarpment, and a thinned continental crust, whose thickness increases toward the continent until it reaches 28 km, with a dip angle of 7–10°. The absence of an accretionary prism suggests that the subduction process of the Rivera Plate beneath the North American Plate to the north of Islas Marías has ceased. In this study, we determined that the morphological expression of the northern limit of the Rivera Plate corresponds to the Islas Marías Escarpment.

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Section: Discussionmentioning

confidence: 53%

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

et al. 2021

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“…Other studies in Western Mexico have used a variety of seismic techniques to understand the tectonic relationship between the various tectonic plates and formation of their related structures (Dañobeitia et al, 1997;Fabriol et al, 1999;Aragón-Arreola et al, 2005;Lizarralde et al, 2007;Brothers et al, 2012;Núñez-Cornú et al, 2016;Núñez et al, 2019;Carrillo-de la Cruz et al, 2019;among others). The region of the Gulf of California and the tectonic processes involved have been addressed with different seismic techniques.…”

Section: Discussionmentioning

confidence: 99%

“…To the south, this range is the northern limit of the larger Tres Marías basin (Núñez-Cornú et al, 2016) (Figure 5A). The continental borderland structures south of the Islas Marías Archipelago are mostly oriented N-S (Figure 5B) (Carrillo-de la Cruz et al, 2019). This structural trend changes to NW-SE along the IME, being oblique to the María, Magdalena, and South Magdalena ranges.…”

Section: Mcs and Bathymetry Datamentioning

confidence: 92%

“…In addition to the tectonic complexity of the poorly understood boundary between RP and NOAM, the structural and tectonic relationships between the continental and oceanic crust are vaguely understood in this region. Some seismic and tectonic studies around the archipelago provide new information about the structural characteristics to the north (Madrigal et al, 2021), west (Santibáñez-López, 2018, and south (Carrillo-de la Cruz et al, 2019). Further, the term "Islas Marías Block" (IMB) has been proposed as a tectonic unit bounded by the West Ranges, which are three linear morphological features controlled by NE-SW and NW-SE faults (Escalona-Alcázar et al, 2019).…”

Section: Regional Tectonic Settingmentioning

confidence: 99%

“…In addition to the earthquakes caused by the subduction process between the RP and the NOAM, there are other tectonic structures in the north of the RP capable of producing seismic events of moderate magnitudes and significant seismic hazards (Marín-Mesa et al, 2019). In this region, the seismicity is principally concentrated around Sierra de Cleofas (SC) and Magdalena south fault, while in the north and east of the archipelago, seismic events are scarce (Tinoco-Villa, 2015;Núñez-Cornú et al, 2018;Escalona-Alcázar et al, 2019;Marín-Mesa et al, 2019). This scarcity could be due to the lack of seismic stations near the IMB, making it difficult to record and locate lower magnitude events or true quiescence.…”

Section: Regional Tectonic Settingmentioning

confidence: 99%

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The Extended Continental Crust West of Islas Marías (Mexico)

et al. 2021

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The crustal structure around the Islas Marías Archipelago has been debated for a long time. An important unresolved question is where the Rivera-North American plate subduction ends and the Tamayo fracture zone begins, from SE to NW. Results from the TsuJal project have shed light on the northwesternmost part of the Jalisco block structure. It is now clear that Sierra de Cleofas and the Islas Marías Escarpment comprise the northwestern continuation of the Middle America trench. However, other questions remain. In this paper, we present the structure of the shallow and deep crust and the upper mantle of the Islas Marías western region through the integration of multichannel seismic reflection, wide-angle seismic bathymetric and seismicity data, including records of an amphibious seismic network, OBS, and portable seismic stations, purposely deployed for this project, providing an onshore-offshore transect of 310 km length. Our findings disclose new evidence of the complex structure of the Rivera plate that dips 8°–9° underneath the NW Jalisco block as revealed by two seismic profiles parallel to the Islas Marías Escarpment. Moreover, we find five sedimentary basins and active normal faults at the edges of tectonic structures of the E-W oriented West Ranges and the N-S trending Sierra de Cleofas. Furthermore, the Sierra de Cleofas is the beginning of the active subduction of the Rivera plate beneath North America. The oceanic crust thickens and submerges towards the south while is coupled with the continental crust, from 6 km at the northern ends of the seismic profiles to 15 km in the contact region and 24 km at the coast and southern ends of them. The continental Moho was not fully characterized because of the geometry of the seismic transects, but a low-velocity layer associated with Rivera Plate subduction was observed beneath the Jalisco Block. Our results constrain the complexity of the area and reveal new structural features from the oceanic to continental crust and will be pivotal to assess geohazards in this area.

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Risk assessment at Puerto Vallarta due to a local tsunami

Trejo-Gómez¹,

Núñez-Cornũ²

2021

Nat Hazards

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The Jalisco region in western Mexico is one of the most seismically active in the country. The city of Puerto Vallarta is located at Bahía de Banderas on the northern coast of Jalisco., Currently there exists a Seismic Gap in the Northern coast of Jalisco (Vallarta Gap). Historically seismogenic tsunamis have affected the coast of Jalisco. In this work, the risk due to a local tsunami in the city of Puerto Vallarta is a function of the interaction between hazard and vulnerability. We model the tsunami hazard, generation and propagation, using the initial conditions for a great earthquake (Mw ≥ 8.0) similar to those that occurred in 1787 at Oaxaca and in 1995 at Tenacatita Bay, Jalisco.Vulnerability is estimated with available data for the years 2010-2015 with sociodemographic variables and the location of government, commercial or cultural facilities. The area with the highest vulnerability and risk is between the valleys of the Ameca and Pitillal Rivers, extending to a distance greater than 5.1 km from the coastline and affecting an area of 30.55 km2. This study does not consider the direct damage caused by the tsunamigenic earthquake and aftershocks; it assumes that critical buildings in the region, mostly hotels, would not collapse after the earthquake and could serve as a refuge for its users. The first (It) tsunami wave arrives to Puerto Vallarta (Cuale) 19 min after the earthquake with a height (Hi) of 3.7 m, the Run Up (At) arrives 74 min after earthquake with a height (Hr) of 5.6 m.

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Tectonic Analysis of the Southern of María Cleofas Island from Bathymetric and Seismic Data

Cited by 5 publications

References 23 publications

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

The Extended Continental Crust West of Islas Marías (Mexico)

Risk assessment at Puerto Vallarta due to a local tsunami

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