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Geosphere features top geoscience technology, including LiDAR, EarthScope, CHIRP, ALSM, and IODP
Date:4/23/2013

s cuts the southwest margin of the Gulf of California and across the southern tip of the Baja California peninsula. This is the gulf margin fault system of the oblique-divergent plate boundary within the Gulf of California. Detailed geologic and geomorphic mapping along the onshore San Juan de los Planes and Saltito fault zones allow authors Melanie M. Coyan and colleagues to delineate geometric sections and to infer the tectonic history of the fault zones. To achieve a more complete understanding of these individual normal faults within a larger array, Coyan and colleagues mapped faults to ~10 km offshore using seismic CHIRP (compressed high-intensity radar pulse) profiling. Both onshore faults slip at a low rate and have a low total offset. Along the San Juan de los Planes fault zone, which is entirely onshore, the young, scarp-forming fault reactivated older faults to rupture a broad, low-relief pediment surface with thin Quaternary cover, reflecting a two-stage slip history along this fault zone. The offshore study suggests a northward continuation of the onshore Saltito fault, and a complex fault array north of the La Gata fault on the east side of the San Juan de los Planes basin extending northward to the west Cerralvo fault. Study results suggest relatively low rates of active faulting of less than 1 mm/yr across the San Juan de los Planes system of faults compared to high rates on the active gulf-axis system, and relatively higher rates on earlier Neogene gulf margin faults in other areas along the southwest Gulf of California margin.


Geologic setting of the Pea de Bernal Natural Monument, Quertaro, Mxico: An endogenous volcanic dome
Gerardo J. Aguirre-Daz et al., Centro de Geociencias, Universidad Nacional Autnoma de Mxico, campus Juriquilla, Boulevard Juriquilla 3001, Juriquilla, Quertaro, C.P. 76230, Mxico. Published online 4 Apr. 2013; http://dx.doi.org/10.1130/
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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