Multichannel Seismic Imaging of the Rivera Plate Subduction at the Seismogenic Jalisco Block Area (Western Mexican Margin)
During the TSUJAL marine geophysical survey, conducted in February and March 2014, Spanish, Mexican and British scientists and technicians explored the western margin of Mexico, considered one of the most active seismic zones in America. This work aims to characterize the internal structure of the subduction zone of the Rivera plate beneath the North American plate in the offshore part of the Jalisco Block, to link the geodynamic and the recent tectonic deformation occurring there with the possible generation of tsunamis and earthquakes. For this purpose, it has been carried out acquisition, processing and geological interpretation of a multichannel seismic reflection profile running perpendicular to the margin. Crustal images show an oceanic domain, dominated by subduction–accretion along the lower slope of the margin with a subparallel sediment thickness of up to 1.6 s two-way travel time (approx. 2 km) in the Middle American Trench. Further, from these data the region appears to be prone to giant earthquake production. The top of the oceanic crust (intraplate reflector) is very well imaged. It is almost continuous along the profile with a gentle dip (<10°); however, it is disrupted by normal faulting resulting from the bending of the plate during subduction. The continental crust presents a well-developed accretionary prism consisting of highly deformed sediments with prominent slumping towards the trench that may be the result of past tsunamis. Also, a bottom simulating reflector (BSR) is identified in the first half a second (twtt) of the section. High amplitude reflections at around 7–8 s twtt clearly image a discontinuous Moho, defining a very gentle dipping subduction plane.
KeywordsJalisco Block Mexico Rivera plate crustal structure seismic imaging subduction earthquake tsunami BSR gas hydrate trench infill
Subduction is the geodynamic process by which one tectonic plate converges with and slides beneath another tectonic plate, finally sinking into the mantle; its motion being driven by the higher density (colder) of the descending oceanic slab with respect to the surrounding mantle asthenosphere. At depths between 80 and 120 km, oceanic basalt is converted to eclogite, which further increases the slab density and the downward force. The interplate coupling is weaker for older plates (Kanamori1977), and the friction along the main thrust interface increases with increasing velocity of the subducting lithosphere. As a consequence, high rates of earthquakes, defining the Wadati–Benioff zone, and tsunamis occur in subduction zones where the subducting slab is old. The cold environment of the slab depresses the local geothermal gradient and increases the portion of the Earth deforming in a brittle manner.
Recent research based mainly on the 2011 Tohoku event has suggested that the generation of huge tsunamis may require the release of gravitational energy as well as elastic energy (Georgeet al.2011). This gravitational energy comprises primarily crustal wedge uplift. When a megathrust earthquake occurs, gravitational energy is discharged by the formation of giant landslides or the rigid motion of a crustal block sliding though a normal fault or splay faults that may produce the subsequent tsunami generation (Grilliet al.2012). Therefore, monitoring bathymetry and gravity before and after such events, especially involving the crustal wedge, will help scientists to understand the phenomenology and estimate the associated risks. As a consequence, there is an obvious need to reevaluate earthquake and tsunami hazard assessments based on these data.
The Rivera plate is particularly a region where large earthquakes have occurred with very destructive consequences, including the generation of big tsunamis, e.g., the Mw >8.0 1932 and 1995, demonstrating that the Jalisco Block is a zone of high seismic potential as a consequence of the subduction dynamics. Research in subduction zones includes several geophysical techniques, such as multichannel reflection seismic and high-resolution bathymetry.
The main objective of this work is to characterize the internal structure of the Rivera Subduction Zone in the Jalisco Block area to understand the geodynamic and the recent tectonic deformation. A key point in the definition of sources (faults, landslides) is to conduct a study of the relationship between superficial, including the seafloor structure, and depth structures where the lithosphere subducts and major seismic activity occurs. Growing understanding of subduction dynamics suggests that crustal deformation near subduction zones will have to be monitored and investigated in detail to obtain the information needed for tsunami risk estimation. Understanding the lateral and vertical extent of the boundaries of the subducting slab will constrain plate tectonic configurations and the timing of events in the western Mexican margin.
To understand the processes involved in the subduction of the Rivera plate and to solve the lack of seismic imaging and bathymetry information, a multidisciplinary geophysical approach is needed to characterize the area from the surface, to the deep zones. This information will be of paramount importance for future seismic hazard assessment. We describe the acquisition, processing and the geological crustal interpretation of a multichannel seismic marine profile running perpendicular to the coast at the Jalisco Block area. These data, of unprecedented quality, were recently acquired in the framework of the TSUJAL (TSU-nami and JAL-isco) project (Bartoloméet al.2015). The unprecedented quality of the data provides a brand new seismic image of the internal structure of the Rivera Subduction Zone beneath the North American plate from which the geodynamic context can be inferred. Furthermore, the characteristics of the interaction between the Jalisco Block and the sediments thickness of the trench clearly indicate the probability of the occurrence of large earthquake.
2 Geological Setting
The area has also been subjected to the effects of at least two Ridge–Trench collisions. The first collision occurred at around 10 Ma when the EPR collided with the trench off the southern tip of Baja California, the collision most likely was responsible for the separation of the Rivera plate from the rest of the plate to the south and the initiation of slab windowing between the Rivera and Cocos plates (e.g., Klitgord and Mammerickx1982; Bandy1992). The second collision occurred at around 2 Ma when the northward propagating segment of the EPR collided with the MAT near Manzanillo/Chamela (Bandy1992; Lonsdale1995; Michaudet al.2000, 2001; PeláezGaviriaet al.2013). The effects of the most recent collision in the Jalisco/Colima area have been largely unaddressed in the literature and deserve more attention.
The Rivera plate began to separate from the Cocos plate at about 10 Ma (DeMets and Traylen2000) as evidenced by spreading velocities along the East Pacific Rise and Mathematician Ridge. Several models exist for the Rivera-North America Euler vector (e.g., Minster and Jordan1979; Bandy and Pardo1994; DeMetset al.1994, 2010; Lonsdale1995; DeMets and Wilson1997; Bandyet al.1997; Arguset al.2010; Suárezet al.2013). These models differ somewhat, however, almost all indicate that the convergence rate between the Rivera and North American plate decreases northward along the MAT [averaging about 2–3 cm/year, which is slower than the adjacent Cocos plate (5–8 cm/year)] and becomes highly oblique north of 20°N (see discussion by Kostoglodov and Bandy1995). Rivera plate subduction is characterized by a steeper angle and more northerly trajectory than the adjacent Cocos plate, with a dip angle increasing at depths around 100 km (e.g., Bandy1992; Pardo and Suárez1995).
A summary of DSDP site, 473 results and interpretations of a 287 m long drill obtained on the Rivera plate, south of Tres Marias Islands, indicates that oldest sediments are 6–6.5 Ma (Upper Miocene) and no older than 8 Ma with igneous rocks present at the bottom of the core. Moreover, Klitgord and Mammerickx (1982) published that the lithosphere of the Rivera plate consumed at the trench dates as late as Miocene (approx. 9 Ma), whereas the Cocos crust near the Rivera plate is 10 Ma and progressively becomes older to the SE, being 25 Ma old at 90°W. Terrigenous clay deposited in the early Pliocene to Quaternary and calcareous claystone deposited during early Pliocene are separated by a strong seismic reflector from the Upper Miocene sediments in the core. Sediments are unexpectedly terrigenous despite the distance from land and the MAT. Sediment accumulation rates are 40 m/million years for the last 3 million years and 20 m/million years from 3 to 6.5 million years. Sediment velocities are 1.5–1.6 km/s increasing to 1.98 km/s at the basal sediments. Igneous rocks below the sediments are mainly massive, altered diabase with a density of 2.7 g/cm3 and a velocity of 5.2–5.3 km/s, but a fragment of pillow basalt was found at the bottom of the drill.
The margin along the Middle America trench from the Tres Marias Islands to the Manzanillo Area (18°N, 104°W) was uplifted and emergent before the late Miocene. The margin started to subside during the upper Miocene-lower Pliocene (coincident with the initial formation of the Rivera plate as an independent plate) and continued to subside at least until the Pliocene-Quaternary limit (Mercier de Lepinayet al.1997). From the Pliocene-Quaternary limit (approx. 2.5 Ma), the Manzanillo area continue subsiding whereas the Tres Marias Islands began to be uplifted (McCloyet al.1988). Regional subsidence of an active margin is generally related to tectonic erosion, and therefore, such long-term subduction erosion regimen for the Manzanillo area implies trench retreat along the margin (MercierdeLepinayet al.1997). Recent overview of Ramírez-Herreraet al. (2011) confirm that, although spatial and temporal variability exists, coastal subsidence is occurring at the southern Colima Graben and the Guerrero seismic gap near Acapulco, whereas coastal uplift is occurring between Puerto Vallarta and Manzanillo and along the coast south of the Colima/El Gordo Graben until Lazaro Cardenas, located southeast of Acapulco.
The Jalisco Block of western Mexico is generally considered as part of the NA plate; however, it may have some degree of independent motion. There are active faults along the Tepic-Zacoalco and Colima rifts in southwestern Mexico that some authors considered to be related to Rivera-North America tectonics (Allan1986; Johnson and Harrison1989; Allanet al.1991, Fig. 1). However, Bandy and Pardo (1994) found, based on a plate kinematic analysis that if the Jalisco Block is moving relative to NA, its motion must be less than 1 cm/year. Consistent with this result, Selvanset al. (2011) find a slow motion of 2 mm/year to the southwest for the Jalisco Block relative to NA in a recent GPS campaign conducted near the triple junction near Guadalajara. This motion may be compatible with a tearing of the Jalisco Block away from NA, however, the authors point out that the motion could be related to the behavior of the earthquake cycle for this margin and if so, the Jalisco Block may not be an independent crustal block.
Recent studies also evidence gas hydrates (Minshullet al.2005; Bartolomeet al.2011; Bandy and MorteraGutiérrez2012) in the form of bottom simulating reflectors (BSR) on multichannel seismic reflection profile located in the continental slope area of the northern part of the Jalisco Subduction Zone, off Puerto Vallarta, between 20° and 20.5°N, as well as off Manzanillo. Thus, there is evidence to suggest that the Pacific margin of Mexico may contain significant reserves of hydrocarbons in form of gas hydrates.
3 Earthquake History of the Jalisco Region
Moreover, not only do earthquakes associated with subduction processes occur in the region, but also large intraplate earthquakes take place, such as the historical events of December 27, 1568 and February 11, 1872. However, there is a debate concerning the interplate (Nunez-Cornuet al.2011) versus intraplate (Andrewset al.2011; QuintanarRobleset al.2011) origin of the Armería earthquake (Mw 7.4) of 2003, located near the diffuse triple junction between the Cocos, Rivera and NA plates.
4 Data and Methods
The data used in this study consist of multibeam bathymetric data collected in the Rivera, Cocos and NA plate offshore of the Jalisco Block, and one 65.5 km long, ESE–WNW oriented, multichannel seismic reflection profile, TS06b, running almost perpendicular to the Rivera Subduction Zone that was collected during the TSUJAL project (Fig. 3). The experiment took place onboard the 90 m long RRS JAMES COOK from the National Environmental Research Council (NERC) between February 17 and March 19, 2014. The ship includes a hull mounted water mapping system composed by a Kongsberg EM120 and Kongsberg EM710 multibeam echosounders, and the raw data were processed using the CARIS software (v. 8.1) while onboard by ICM technicians to produce a 80 × 80 m grid of bathymetric values. One Expendable Bathy Thermographs (XBT) per day was launched during the survey to measure water velocity profile and whose values have been integrated into the echosounder acquisition program.
Multichannel seismic data were acquired aboard the RRS James Cook using, for the first time, the 6 km long digital streamer belonging to the Spanish RV Sarmiento de Gamboa (Bartoloméet al.2015; Núñez-Cornúet al.2016; Dañobeitiaet al.2015), in the framework of a bilateral barter agreement between the National Environmental Research Council (NERC) and Consejo Superior de Investigaciones Cientificas (CSIC), thanks to the European research alliance OFEG (Ocean Facility Exchange Group). The hydrophone streamer was deployed at 10 m depth with 468 active channels (5850 m length) separated 12.5 m apart. CMP distance is 6.25 m and allows a CMP nominal fold of 58–59 traces. The source airgun arrays were designed using Gundalf® commercial software to maximize the energy concentrated at the lowest frequency range. The arrays were towed from the center of the stern to the port and starboard sides getting a symmetrical configuration from the streamer. The shooting interval was chosen to be 50 m as a compromise between maximum redundancy of data (CMP fold) and the capacity of the air compressors. Source array was composed by 12 guns divided in 4 subarrays of 3 guns, employing 3540 in3 (58 L) BOLT® GGuns 1500LL at 2000 psi air pressure, towed at 8 m depth. The data were sampled at 1 ms and recorded in SEG-D format. Shooting during the cruise was carefully carried out following established rules to avoid harming local marine mammals, using soft starts and monitoring the presence of marine mammals and turtles in the vicinity of the vessel, which caused us to stop shooting repeatedly.
5 Results and Discussion
5.1 General Description of the Profile
From west to east, the top of the Rivera plate imaged below the sedimentary cover indicates that the plate is entering at a gentle dip angle (<10°) in this part of the margin. We can distinguish normal faults, and the resulting horst and graben morphology, as a consequence of the extensional stresses produced as the plate bends down into the subduction zone (see from 0 to 25 km in Fig. 6).
Further to the east of the MAT, the top of oceanic basement may be traced continuously for about 20 km beneath the accretionary wedge where the Rivera plate is covered by about 3 s (twtt) of sediments, indicating subduction–accretion in this part of the margin, which is in agreement with previous studies (e.g., Bartolomeet al.2011). A pull up image effect of the Rivera plate under the accretionary prism (from CDP 4000 to CDP 6000, see Fig. 5) is observed. This pull up image effect is not geologically real and is caused by the relative seismic velocity differences of the acoustic waves between the lower velocity water column, left of the accretionary prism, respect to the higher sedimentary velocity cover in the prism, and their consequent representation in time (twtt) causing what appears to be a structural high.
5.2 Oceanic Crustal Structure
The MAT imaged in the section TS06b is about 3900 m deep, only 400 m deeper than the surrounding regional bathymetric oceanic lithosphere (Fig. 3a). Sediment supply origin could be continental following the conclusions of Deep Sea Drilling Project (DSDP) 473. The trench bends sharply northward at 20°N, increasing the obliquity of subduction north of this latitude. There are several factors controlling the depth of the trenches, but possibly the most important is the supply of sediment, which fills the trench and reduces the bathymetric expression of the trench. The deepest trenches in the world, in general, deeper than 8000 m are all non-accretionary (no prism), such as the Mariana (11,000 m), Tonga (10,800 m), and Philippine (10,500 m) trenches. The age of the lithosphere at the time of subduction controls as well the depth of the trench: the older the seafloor (and cooler and thicker), the greater the subsidence of the trench. The slow convergence of the Rivera plate also causes the capacity of the convergent margin to dispose of (i.e., to subduct) sediment to be exceeded. Studies of the sediment fill in the northern part of the MAT are limited (e.g., Ross1971; Renardet al.1980; Mercier de Lépinayet al.1997). The Deep Sea Drilling Project (DSDP) and the Ocean Drilling Program (ODP) data in Mexico are restricted to two different areas. The first area is in front of Acapulco about 700 km further to the south of line TS06b. The second area is that of DSDP Site 473 drilled in 1978 (Fig. 3b) which is located about 70 km southwest of Islas Tres Marias and 90 km NW of seismic line TS06b.
5.3 Continental Structure
The top of the accretionary prism presents a sharp relief, forming two sediment filled basins (Fig. 8). The western basin, herein, referred to as the slope basin, is located in the center of the accretionary prism (between CDP 1600 and CDP 4800), and the sediments observed may be originated during the erosion of the accretionary prism. This took place during different episodes of uplift, generating slumps and normal faults related to gravitational movements that give rise to thrusts in the upper block (Fig. 8). The second basin, located on the eastern border of the profile (from CDP 1 to CDP 1200), is the forearc basin of the subduction system, whose sediments are onlaping the basement. Also, a system of slumps that reaches the base of the prism has been observed (from CDP 5000 to CDP 6400), covered by sediment units.
5.4 Generation of Earthquakes
Recent 2004 Sumatra–Andaman and 2011 Tohoku events violate the classical Ruff and Kanamori (1980) direct relationship between convergence rate and age to the maximum earthquake magnitude (Shearer and Bürgmann2010). It is assumed that faster subducting lithosphere should increase friction at the interface, and that a younger subducting plate (more buoyant and lighter) is strongly coupled with the continental plate. Thus, both faster and younger plates increase the magnitude of the expected event. But the Mw 9.2 Sumatra earthquake occurred in an area with a low convergence rate (3 cm/year) and where the age of the subducting plate is 55–90 Ma old. The Mw 9 Tohoku event occurred in a 130 Ma old subducting plate, which is older than most of the other ocean floors in the world, and where the convergence rate is 10 cm/year. Great earthquakes in the past like the Mw 9+ Chile and Alaska earthquakes occurred on the plate boundary with a convergence rate of 11 cm/year and plate age of 20 Ma, and 6 cm/year and 40 Ma, respectively (Kanamori2006).
Thus, new relationships are needed to relate the magnitude of an earthquake with geophysical parameters. For instance, both tectonic stresses and geometrical irregularities along the subduction interface have been empirically related to giant earthquakes (Mw ≥8.5). Heuretet al. (2012) found a statistical relationship between the occurrence of subduction megathrust earthquakes and the combination of thick trench infill (≥1 km) and neutral upper plate strain. In fact, the combination of these two factors is more highly correlated with the occurrence than either factor alone. When the propagation of rupture in the trench-parallel direction breaks a larger number of thrust fault segments then the magnitude of a seismic earthquake increases. The propagation seems to be controlled by the distribution of geometrical irregularities and thick trench infill would represent the geometrical irregularities along the subduction interface. In other words, trench infill acting as a proxy for smoothing of subducting plate relief by sediment input into the subduction channel and facilitating propagation. Although statistics are difficult due to the limited number of large earthquakes, Schollet al. (2011) demonstrated that trench sectors with axial deposits thicker than 1.0 km are associated with the occurrence of an unusually high number of giants earthquakes (67 % of Mw >8.5 in the Earth). Moreover, upper (in the Jalisco Block at the NA) plate strain would act as a proxy for the tectonic stresses applied to the subduction interface, and the tectonic stresses may be inferred from deformation in the back-arc. The propagation of an initial rupture to neighboring asperities is made difficult by compressive tectonics, easily associated with neutral back-arcs and never associated with extensional domains (Heuretet al.2012). Recent GPS investigations found the Jalisco Block to be moving slowly (2 mm/year) to the southwest relative to NA plate (Selvanset al.2011) or perhaps not even moving as an independent block. Consequently, considering these two factors together: almost neutral strain present in the Jalisco Block (upper plate strain) and large (1.6 km) sediment thickness observed in our seismic profile, the Jalisco Block has the geophysical favorable conditions to generate giant earthquakes.
5.5 Evidence for Gas Hydrates
The BSR imaged crosscuts sedimentary layers, and is easily recognized subparallel to the seaflor along the accretionary wedge and the forearc basin at 0.25–0.3 s (twtt) below the seaflor, extending for about 25 km along the profile (from CDP5800 to CDP2200). The BSR reflector is disrupted, and thus difficult to observe, by the presence of faulting, slumps and landslides, because gas hydrates may dissolve, and finally escape, causing the impedance contrast to disappear (Figs. 6, 10). This indicates that slope failure can cause the destruction of BSRs. But also rapid decompression of the underlying sediments in areas with occurrence of BSR (indicating methane hydrate) could lead to catastrophic release of methane and the resulting margin destabilization with the occurrence of mass transport deposits.
Deep faulting observed along the profile at the top of the oceanic Rivera plate can play an important role for circulation of fluids and the formation of gas hydrates in the accretionary prism, especially in two particular areas. First, in the décollement zone or basal thrust, which acts as a conduit for fluids producing wet sediments, and second in the accretionary wedge, where rapid rates of upward fluid flow and seafloor uplift occur (Fossen2010, see Fig. 10). Therefore, it is more likely to occur serpentinization processes in the deeper part of the interplate contact due to the alteration process of olivine in the presence of water. In subduction zones, this process occurs along deep faults where oceanic plates enter, near the base of the mantle wedge at depths up to 150 m depth (Manea and Manea2011) and always greater than 10 km. The décollement or basal thrust is identified in the interplate boundary, but the seismogenic zone is located in deeper areas of the subduction system not imaged by the TS06b. Subduction of serpentinized rocks enhances the generation of earthquakes and melting production in the mantle wedge, being able to influence the position of the melting front (and volcanic arc).
Processing and interpretation of the line TS06b acquired during the TSUJAL survey has allowed to obtain, for the first time, a high quality seismic image of the entire internal structure of the Rivera Subduction Zone beneath North American plate. This paper shows the main structures in the Jalisco Block area at crustal scale, characterized by their geometry, morphology, dimension, deformation and fracturing of the internal structure, depth and their lateral continuity. In this way, accretionary prism, slope basins associated, forearc basin, crust–mantle boundary and interplate limit have been identified.
Evidence of BSRs reflectors compiled using the available multichannel seismic data in the continental slope region of the entire Jalisco Subduction zone suggests that extensive gas hydrates accumulations may exist in this area.
Normal faulting and the resulting horst and graben geometry are observed in the Rivera plate as a consequence of the bending of the plate as it begins to subduct beneath the NA plate. Fluid circulation of oceanic water can easily enter into the subduction system using these fault paths, helping the formation of gas hydrates and serpentinization.
Subduction accretion is the dominant process at the Jalisco Block near Puerto Vallarta along the lower slope of the margin, in agreement with the occurrence of an accretionary prism and the young age of the Rivera plate
The combination of a thick (1.6 km) sediment infill within the trench and an almost neutral strain in the Jalisco Block indicates that the area is prone to giant earthquake occurrence.
We acknowledge the Captain and crew of the RRS James Cook, the seismic UTM-CSIC technical team and Luis Ansorena for their professional work, and the officers and crew of the AMR Holzinger (Secretaría de Marina, Mexico) and CABO/UNAM J-GAP2013 Cruise (BO El Puma, Mexico) which made possible the success of the TSUJAL cruise. We gratefully acknowledge financial support from MINECO (Spain) through TSUJAL project (CGL2011-29474-C02-01) and “Ramon y Cajal” program (R. Bartolome), and from Mexico through CONACYT–FOMIXJAL 2008–96567 (2009); CONACYT–FOMIXJAL 2008–96539 (2009); CONACYT–FOMIXJAL 2010–149245 (2011); CONACyT-FOMIXJal (2012-08-189963) and also partial funding was provided by UNAM DGAPA Grant #IN115513-3. We also gratefully acknowledge the support of the Mexican Instituto Oceanográfico del Pacífico in Manzanillo, Secretaría de Defensa Nacional, Unidad Municipal de Proteccion Civil y Bomberos (Puerto Vallarta), Unidad Estatal de Proteccion Civil y Bomberos (Nayarit State), Unidad Municipal de Proteccion Civil y Bomberos (Jalisco State), Reserva de la Biosfera (Islas Marías) CONANP-SEMARNAT, Órgano Desconcentrado de Prevención y Readaptacion Social de la SEGOB, Secretaría de Relaciones Exteriores for their help during all the cruise. This work was carried out within the Grup de Recerca de la Generalitat de Catalunya B-CSI (2014 SGR 940).
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