Structural and Seismic Stratigrapic study in the Center of the Magdalena Shelf in the Western Margin of Baja California Based on Seismic Reflection Data

González-Escobar, Mario; Salazar-Cárdenas, Rosa M.; Munguía, Luis; Martín‐Barajas, Arturo; Suárez-Vidal, Francisco

doi:10.1007/s00024-016-1396-7

Cited by 2 publications

(16 citation statements)

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“…These faults had already been reported, mainly based on bathymetric studies [17]. Subsequently, through seismic profiles made in 2002 during the FAMEX oceanographic campaign [4] and more recently by [10], where the structure of the Magdalena Shelf was characterized, to the south of the area of the present work, the region studied here is not known. These authors report the location and distribution of the faults, but the difference with this work is that it is intended to give a detailed characterization of the Santa Margarita and San Lázaro faults.…”

Section: Discussionmentioning

confidence: 73%

“…These authors report the location and distribution of the faults, but the difference with this work is that it is intended to give a detailed characterization of the Santa Margarita and San Lázaro faults. For this, we analyzed from a set of seismic profiles (net) assisted with a complete anomaly map of Bouguer (Gravimetric) obtained from [18], Figure 4: Location of seismic profiles (white and black lines), processed and interpreted for this studio work; yellow seismic profiles are [10] and green profile from [2]. SLF: San Lázaro Fault; SMF: Santa Margarita Fault; TAF: Tosco-Abreojos Fault.…”

Section: Discussionmentioning

confidence: 99%

“…which allows us to project these faults according to the anomalies. Also, some faults [10], were incorporated in this work, for the correlation.…”

Section: Geological Settingsmentioning

confidence: 99%

“…It is important to mention that the studies carried out to the south of the study area [2,10], show reflectors associated to three main stratigraphic units of the Neogene (A, B and C), where the reflector C is considered as the angular unconformity that separates the Neogene sequence of the Paleocene-Eocene sequence that fills the forearc basin. Below the unconformity, there is a huge packet of Miocene sediments, identified as the oldest ~8 Ma in the northern region of the Magdalena shelf [10]. Although the seismic activity in the region is very low, as reported by [19], it is inferred that the region is tectonically active.…”

Section: Geological Settingsmentioning

confidence: 99%

“…The seismic data covers an area of ~350 km 2 , which helped in obtaining the geometrical characteristics of faults and seismostratigraphic units in the central part of the Magdalena Shelf ( Figure 2). The present work includes the processing and interpretation of eight seismic reflection profiles (Figure 1 and Figure 3), as well as information reported and interpreted by [2] and [10]. The characteristics are presented to have a view of the main structures, their architecture, and the shape of the sedimentary deposits.…”

Section: Introductionmentioning

confidence: 99%

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Forearc Basin: Characteristics of the Subsurface in Magdalena Shelf, Baja California, Mexico, from the Interpretation of Seismic-Reflection Profiles

A¹,

González-Escobar²

2020

Int J Earth Sci Geophys

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Eight seismic reflection profiles, two dimensions, were collected in a sector of the Magdalena Shelf, Baja California, Mexico, which contains a forearc basin, providing a spatial view of faults and seismic reflectors in this basin. Two small asymmetric basins were configured; Tosco-Abreojos and San Lázaro controlled by the Tosco-Abreojos and Santa Margarita-San Lázaro Faults. These faults accommodate a great part of the transtensional stress in the shelf and control the bathymetry and show great deformation in the western sector. Seismic horizons illustrate that the depocenter of the San Lazaro basin reaches depths of ~4 km, while the Tosco-Abreojos account reaches depths of around ~5.5 km, being present at these depths a diffuse reflector that is considered the acoustic basement. Santa Margarita fault is present in the Santa Margarita and Magdalena islands, extending northwest, then stop presenting its relief represented by the San Lazaro fault, which is associated with the seismic activity resent reported for the region. Reflectors observed to the south of the region, previously reported by other works, were also observed in this area. However, there are new reflectors to the NW, which fill the spaces of both basins, taking a total of eight seismostratigraphic units. Unconformity is present throughout the region that separates the Neogene sequence from the Paleocene-Eocene sequence that fills the forearc basin. Below the unconformity, there is a huge packet of Miocene sediments. Structural height corresponding to the subduction complex that extends in the SE-NW direction along the Magdalena Shelf is present, which is considered as the acoustic basement and is attributed to the ophiolite rocks. This structural height can be related to the Alto Lagunitas, located in the central part of Baja California, where an ophiolite rock is also present. But Magdalena Shelf is more recent than the Alto Lagunitas since the said rocks in this place are younger arch. From the results obtained, Santa Margarita Fault should be considered for future risk studies, since it is tectonically active and its path passes near population centers, such as Puerto San Carlos.

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

“…which allows us to project these faults according to the anomalies. Also, some faults [10], were incorporated in this work, for the correlation.…”

Section: Geological Settingsmentioning

confidence: 99%