Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project

Dañobeitia, Juanjo; Bartolomé, Rafael; Prada, Manel; Núñez-Cornũ, F. J.; Córdoba, Diego; Bandy, William L.; Estrada, Ferrán; Cameselle, Alejandra L.; Núñez, Diana; Castellón, A.; Alonso, José Luis Sanz; Mortera, C.; Ortiz, Modesto

doi:10.1007/978-3-319-51529-8_18

Cited by 4 publications

(7 citation statements)

References 55 publications

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“…Toward the northeast, the North Rivera Basin is observed between 27 and 40 km with a thickness of 0.6 s approximately (Figure 7). In this basin, a structure rises from the acoustic reflector, which could be a volcano, as Dañobeitia et al (2016) suggested, or a horst since it is fault-bounded. Moreover, the sedimentary horizons are subhorizontal on both sides of the horst.…”

Section: Multichannel Seismic and Bathymetric Datamentioning

confidence: 83%

“…Furthermore, our study clarifies the nature of two structures previously not adequately located in the study region. One is the fault-bounded María Range (Escalona-Alcázar et al submitted), which was previously mistakenly reported as the María Magdalena Rise (Dañobeitia et al, 2016). However, according to Lonsdale (1989), the María Magdalena Rise is situated to the west of the TS09b profile (Figure 1).…”

Section: Discussionmentioning

confidence: 99%

“…The complex architecture of Rivera and North American plate interaction has been studied in the northern region of Islas Marías Archipelago. Previous bathymetric studies have been reported in this area, but few have been analyzed together with multichannel seismic profiles (Lizarralde et al, 2007 (Figure 1); Sutherland et al, 2012;Dañobeitia et al, 2016;Carrillo-de la Cruz et al, 2019). Most of the studies tried to establish the nature of the crust of the Islas Marías, which is still under debate.…”

Section: Discussionmentioning

confidence: 99%

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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: Multichannel Seismic and Bathymetric Datamentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Crustal Structure Across the Northern Region of the Islas Marías Archipelago

et al. 2021

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“…The western border of JB defined by the MAT. Dañobeitia et al (2016) and Núñez-Cornú et al (2016) found that to the north of the Marias Islands, there is no clear evidence of an active subduction zone. Instead, faulting is observed to the west of the Marias Islands, while to the south between the María Magdalena and María Cleofas islands, the subducted slab of the Rivera Plate is delineated by regional seismicity.…”

Section: Tectonic Setting and Local Tsunamismentioning

confidence: 96%

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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“…Recently, in the western Mexican margin, new geologic and marine geophysical research has been carried out to study the interaction between RP, CP, and NOAM (Núñez-Cornú et al, 2016;Dañobeitia et al, 2016;Núñez et al, 2019;Carrillo-de la Cruz et al, 2019, among others) and characterize the potentially tsunamigenic and seismogenic structures to assess geohazards and risks of this region. During the active acquisition stage of the TsuJal project, a combined off-and onshore experiment included two combined seismic methods, multichannel and wide-angle seismic, and multibeam bathymetry from Islas Marías (Nayarit state) to the south of Manzanillo (Colima state) (Figure 2A) (Dañobeitia et al, 2016;Núñez-Cornú et al, 2016). In this composite tectonic scenario, we focused on the crustal study of the western Islas Marías Archipelago.…”

Section: Introductionmentioning

confidence: 99%

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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Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project

Cited by 4 publications

References 55 publications

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

Crustal Structure Across the Northern Region of the Islas Marías Archipelago

Risk assessment at Puerto Vallarta due to a local tsunami

The Extended Continental Crust West of Islas Marías (Mexico)

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