Additional ∼700-m-thick lacustrine deposits cut in well ELS-1 suggest that the vertical slip of the Cañón Rojo fault may attain ∼2000 m near its intersection with the Laguna Salada fault. When dry, the flatness of the exposed lake bed sediments makes it a favoured location for recreational driving. 3), and thus basement is likely deeper in the north basin domain near the Laguna Salada fault. 4B), we interpret five stratigraphic sequences with basal boundaries defined by these continuous reflectors of facies 1. 2). This sag is likely controlled by a west-dipping fault and at least two east-dipping antithetic faults. 4 and 6). It is shaped somewhat like an hour-glass, long and skinny and very narrow at the center. thesis], A gravity and magnetic study of the Laguna Salada area, B.C. Due to their lateral continuity, facies 1 and 2 are interpreted to represent flooding and prolonged lacustrine conditions produced by the Colorado River entering Laguna Salada Basin. Horizons in black are sequence interpreted boundaries. 5A). Another prominent relief in the acoustic basement occurs at the northwest end of profile 5076-b (Fig. Abbreviations, inset map: ELS-1 to ELS-3, well of Comisión Federal de Electricidad (CFE). 5B). 8). The Chupamirtos fault likely represents the structural boundary between two basin domains. The acoustic basement beneath the hanging wall is disrupted by faults with tents to a few hundred meters of offset. These last events are concentrated in the northwestern basin domain, and no correlation with faults antithetic to the CDD is observed. La peligrosa Laguna Salada de Baja California 2 minutos Cuando uno piensa en la palabra “ laguna ”, se imagina un cuerpo de agua rodeado de tierra, escenario de hermosos paisajes. The LSB is structurally separated from the Salton Trough in southern California by the northern extension of the Laguna Salada fault (LSF), which splits in both left-stepping and right-stepping shear strands (Isaacs, 1987) and produces basement ridges up to ∼660 m (Fig. The stratigraphic units in seismic lines in Laguna Salada are interpreted on the basis of seismic facies and stratigraphic sequences limited by sequence boundaries. The south domain is a supradetachment basin controlled by the Cañada David detachment fault. However, a large negative Bouguer gravity anomaly straddles the main gulf escarpment and the central part of the LSB. The LSF and the CDD fault are kinematically linked by the Cañon Rojo and Chupamirtos faults (Mueller and Rockwell, 1991) (Fig. This well did not reach the Imperial marine mudstone unit inferred to lie at a depth as recorded in stratigraphy of the Cerro Colorado basin (Vázquez-Hernández et al., 1996). Southward the modern basin becomes narrower and connects through a ∼5–10-km-wide inlet with the modern delta plain of the Colorado River and the tidal flats of northern Gulf of California (Fig. Range-front fault scarps of the Sierra Mayor, Baja California: Formed above an active low-angle normal fault? Mueller and Rockwell (1991) proposed that the Cañón Rojo fault is a dilatation stepover in a pull apart bounded by the dextral oblique Chupamirtos fault. 4A and 4B). Active-source, seismic-reflection data constrain the geometry of the active detachment fault and indicate two structural domains. An eastward migration of the depocenter is depicted upward in profile 4965 (Fig. The south domain is a supradetachment basin controlled by the Cañada David detachment fault. (2001) indicates that the basin fill adjacent to the LSF is ∼3 km thick, which is a reasonable estimate of basement depth. (2001), is located along the Laguna Salada fault, Cerro Prieto geothermal field, and the eastern front of Sierra Juárez, and only 17 events lie within the Laguna Salada Basin. Its low-angle (<20°) and Quaternary fault scarps display a curvilinear trace extending ∼55–60 km along the western mountain front of Sierra El Mayor (Fig. LAGUNA SALADA, BAJA CALIFORNIA SUR, MEXICO. The lower lens shape sequence is ∼4 km wide and ∼500 m thick, and the seismic reflections are parallel to the acoustic basement (Fig. 1 and 2). This suggests either a basin depocenter above homogeneous lithology of crustal rocks or a deep crustal root that flexurally supports topography (García-Abdeslem et al., 2001). It is in the state of Baja California in the city of Mexicali. TIME: February 23, 1892 / 11:20 pm PST. At this latitude, the active plate boundary zone is 33 km wide between the Imperial and the Laguna Salada faults and is 26 km wide between the Cerro Prieto fault and the Cañada David detachment (Fig. Facies 3 is low-amplitude, discontinuous wavy reflections (e.g., white intervals), and facies 4 is defined as discontinuous, high- to low-amplitude, imbricated to chaotic pattern of reflectors. Profile 5076-b (Fig. The acoustic basement in the hanging wall deepens to a maximum of ∼2100 m in profile 4973 and to ∼2500 m in profile 4965 (Figs. The fault located in the SW sector of the seismic profile coincides with the western shore of the lagoon flood plain. The rupture propagated north along a complex dextral-oblique fault zone parallel to Laguna Salada fault through the Sierra Cucapah (Fletcher et al., 2014; Terán et al., 2015). 1 and 2 for location) across the western end of the north basin domain. humberto robles. The Cañón Rojo and Chupamirtos faults produced the abandonment of the Cerro Colorado synformal domain of the Cañada David detachment and reduced in ∼25% its original length (Siem and Gastil, 1994; Fletcher and Spelz, 2008). The supradetachment basin domain accumulates a sedimentary wedge more than 2.5 km thick in the west-central part of the basin, and the subsurface portion of the Cañada David detachment represents 24% of extension in the western main plate boundary zone. We observe a systematic lateral facies change across the three transversal profiles (Figs. Furthermore, in the southernmost seismic image (profile 4973, Fig. 6B) clearly show that laterally continuous reflectors (seismic facies 1 and 2) penetrate westward and interfinger with facies 3 and 4 produced by alluvial fan deposits. The CCD produces fault scarps along the west side of Sierra El Mayor (from Axen et al., 1999; Fletcher and Spelz, 2009; Spelz et al., 2010). Seismic facies 3 is low-amplitude, poorly contrasted continuous to discontinuous reflectors interpreted as subaerial distal fan sandstone deposits. Mexicali, Baja California is a destination of contrasts that always surprises those who dare to explore it, a sample of this is Laguna Salada. 1). 1). Red stars are two historical earthquakes located within the eastern basin margin: the 1892, Mw > 7 and the 1934, Mw 6.5 (Ellsworth, 1990). La extensión de las aguas durante aquellos años fue variable; en algún momento llegó a tener 60 km de largo por 17 km de ancho y de entre 20 cm hasta 4 metros de profundidad, tal volumen dio pie a actividades pesqueras y turísticas. It is also notorious for its dust storms (when dry), usual… enrique aranda j. i n d i c e. 1. caracteristicas de la laguna salada. The Laguna Salada Basin in northeastern Baja California, México, is an active half-graben with subsidence principally controlled by two major faults along the eastern basin margin—the Cañada David detachment fault and the dextral oblique Laguna Salada fault. Horizon 1 is the first laterally continuous reflector across the basin. Farther south, line 5076-c confirms that crystalline basement is very shallow in the east flank of Sierra Las Tinajas. Guadalupe Canyon Oasis is located southwest of the city of Mexicali in Northern Baja California, Mexico. The exploration wells drilled by the Comisión Federal de Electricidad (CFE) in the LSB are depicted as green dots (ELS-1 to ELS-3). One is the strong asymmetric subsidence that maintains depocenters along the eastern margin near the Laguna and Cañón Rojo faults. The yellow stars denote epicenter location of the three major historical earthquakes recorded in the study area (two in Laguna Salada [LSE] and the El Mayor–Cucapah earthquakes [EMC]), indicating year and magnitudes. La laguna salada forma parte del sistema del Delta del Río Colorado e históricamente ha sido receptáculo de los excedente de sus aguas, así como también de mareas inusitadamente altas del Mar de Cortés,[3]​ esto último, hasta antes de construirse la carretera federal 5 que va de Mexicali a San Felipe. 3). Horizon B–A likely corresponds to the boundary between units 3 and 4 in well ELS-2 (Martín-Barajas et al., 2001). 1) (García-Abdeslem et al., 2001). The seismic networks registered ∼582 microearthquakes with magnitudes lower than 3.6 chiefly concentrated along the LSF and the mountain front of Sierra Juárez toward the southeast (Fig. From profile 4965 (Fig. En el verano, las temperaturas máximas son de aproximadamente 43°C y en el invierno se acercan a los 20°C. It might be a bit of a hot and bumpy ride, but rest assured, your hot tub will be ready for you when you arrive! Es la zona más baja de México, se encuentra a 12 metros bajo el nivel medio del mar. These two crystalline blocks are composed of Late Cretaceous granitic rocks and pre-Cretaceous high-grade metamorphic rocks (Barnard, 1968; Gastil et al., 1974; Siem and Gastil, 1994; Axen et al., 2000). Every Sunday for the last two years Gallardo has cleared the area of trash and planted date palms near the mouth of a dry 35 by 11 mile lake basin known as the Laguna Salada. In fact, Laguna Salada isn’t a lagoon at all. Note again the correspondence of these reflectors with the boundary between units 3 and 4 and the depth to the crystalline basement. The inset map shows the major tectonic features of northwestern Mexico and the location of the study area (i.e., the Laguna Salada Basin—LSB). Its location projects south of the Cañón Rojo fault, and we speculate these two faults may correlate. doi: https://doi.org/10.1130/GES01261.1. Thermal evolution of Monte Blanco dome: Low-angle normal faulting during the Gulf of California rifting and Late Eocene denudation of the eastern Peninsular Ranges. Here the thickest basin fill corresponds to the site where the acoustic basement in the hanging wall intersects the acoustic basement in the footwall block. 8). 1). The lowermost stratigraphic unit in Laguna Salada crops out in the footwall block of the Cañon Rojo fault, a N-S–trending, high-angle normal fault forming a dilatational stepover along the Laguna Salada fault (Fig. This geometric projection suggests that basement in the hanging wall intersects the Laguna Salada fault at ∼3.8 km below the surface, assuming that the Laguna Salada fault maintains a ∼70° dip to the west (Fig. 5B) shows nearly 11 km of chaotic reflectors (facies F4) that we also interpret as alluvial fan deposits close to the north end of Sierra Las Tinajas (Fig. The Chupamirtos fault bounds the Cerro Colorado basin along the west-southwest and likely intersects the CDD north of seismic profile 4965 (Fig. The modern lake basin is bordered by a 5–15-km-wide belt of coalescing alluvial fans derived from Sierra Juárez in the west and by a narrower 0.5–3-km-wide belt of alluvial fans fed from the Sierra Cucapah and Sierra El Mayor in the east. 3). If we conservatively assign 7 Ma for the onset of extension, the 9.7 km of horizontal slip estimated in the CDD represents an extensional rate of ∼1.4 mm/yr. 1 and 2) and the correlation of the seismic sequences with stratigraphy described in three exploratory wells of CFE (Fig. 4), facies 4 is progradational eastward and is absent or poorly expressed in the eastern side of transversal profiles, where facies 1 and 2 dominate. En la actualidad esta región es la zona más baja de todo el país con una altitud de 12 metros bajo el nivel medio del mar.[2]​. Above the lower sequence boundary, the sedimentary sequences have a quasi-symmetric synform shape (cf. Seasonal flooding of the Colorado River inundates the Laguna Salada Basin and produces intermittent estuarine conditions now rarely observed due to dams in the upper Colorado River (Cohen and Heges-Jeck, 2001). 2). The most important erosional feature is observed in profile 4973. (2001) for a local seismic network. 4). This contrasts with the ∼35–42 km crustal thickness beneath the peninsular ranges (e.g., Sierra Juárez) (Lewis et al., 2001). This estimate assumes that the Laguna Salada fault maintains its surface dipping angle of 60° to 70° west, respectively. 1 and 2) controls the basin architecture. Instead, I headed south on the dirt road along the west side of Laguna Salada, which starts at a place called Ejido Luchadores del Desierto ("Fighters of the Desert The navy-blue lines are the modern flooding channel within LSB and the Hardy River east of Sierra El Mayor. Curiously, these faults roughly follow the west shoreline of the lake, and Figure 8 shows the direction of apparent dip in each of these faults in the seismic sections as indicated by yellow marks of apparent strike and dip. (A) Profile 4957 (see inset map and Figs. 4 and 6). 4A and 4B) show erosional features probably related to lateral shifts of estuarine channels during flooding. Furthermore, Hough and Elliot (2004) reported a magnitude of 7.2 using a method based on the distance decay of modified Mercalli intensity (MMI) values for earthquakes in western North America (Fig. In both 4965 and 4973 profiles, the upper sedimentary sequences have a broader distribution and uniform thickness across the basin, although slightly thicker to the east. Southward the flat topography of the basin contrasts with the steep relief of bounding ranges of Sierra Juárez to the west and Sierra Cucapah and El Mayor to the east (Fig. 1). Sequences 2 and 3 unconformably overlie the lower lenticular sequence and have a strong asymmetric thickness controlled by the detachment fault (Fig. La película: Resident Evil: extinción, usó la Laguna Salada como locación fílmica[9]​ de alguna de sus escenas, durante el mes de mayo del 2006 y uno de los episodios del programa: Curiosity,[1] presentado por Discovery Channel, empleó el vaso seco de la laguna para experimentar y filmar la caída de un avión Boeing 727,[10]​ este fue el segundo experimento de su tipo realizado en el mundo y fue realizado el 27 de abril de 2012,[2] para proyectarse en televisión el 7 de octubre de ese mismo año en los Estados Unidos.[11]​. 1 and 2). Crustal extension in the Laguna Salada segment is principally accommodated by the low-angle Cañada David detachment fault (CDD) synchronously with the Laguna Salada strike-slip fault system (Siem and Gastil, 1994; Axen, 1995; Axen and Fletcher, 1998). The red lines are faults mapped by various authors (e.g., Mueller and Rockwell, 1991; Siem and Gastil, 1994; Romero-Espejel, 1997; Axen et al., 1999; Dorsey and Martín-Barajas, 1999; Fletcher et al., 2016). The Laguna Salada Basin is an active asymmetric depression structurally controlled by the Laguna Salada fault and the Cañada David detachment fault. Upwards, facies 1 is laterally continuous both east and west and expands over a broader depocenter. This calculation suggests a somewhat deeper depocenter as proposed by the 2D gravity modeling. It means “salty lagoon” in Spanish. De la laguna ya sólo queda el nombre, pues no hallarás ningún cuerpo de agua por aquí. Laguna Salada is unique among these examples because it is the only documented site of coeval active deformation. (A) Profile 4965 (see inset map and Figs. Between the two ends, basement loses its distinctive high- amplitude characteristic and passes southward into a zone of chaotic reflectors (from cdp 5750–6150). 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