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Loreto Fault

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Journal Article

Footwall drainage evolution and scarp retreat in response to increasing fault displacement: Loreto fault, Baja California Sur, Mexico

Estelle Mortimer, Barbara Carrapa
Journal: Geology
Published: 01 July 2007
Geology (2007) 35 (7): 651–654.
DOI: https://doi.org/10.1130/G23690A.1
...Estelle Mortimer; Barbara Carrapa Abstract The displacement rate history of the Loreto fault, Gulf of California, is well documented; it is characterized by episodically accelerating displacement (10 k.y. frequency) superimposed upon a period of 200 k.y. of increasing fault displacement rate...
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Source Characteristics of the M w 6.2 Loreto Earthquake of 12 March 2003 that Occurred in a Transform Fault in the Middle of the Gulf of California, Mexico

Leobardo López-Pineda, Cecilio J. Rebollar
Published: 01 April 2005
Bulletin of the Seismological Society of America (2005) 95 (2): 419–430.
DOI: https://doi.org/10.1785/0120030227
...Leobardo López-Pineda; Cecilio J. Rebollar Abstract We analyzed the Loreto earthquake of 12 March 2003 M w 6.2, which occurred in the transform fault that joins the Guaymas and Carmen Basins in the middle of the Gulf of California. This event was recorded by a network of autonomous continuously...
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Figure 2. Displacement rate characterization of Loreto fault. Rapid displac...

Published: 01 July 2007
Figure 2. Displacement rate characterization of Loreto fault. Rapid displacement commenced at start of sequence 2 ( Dorsey et al., 1995 ). Superimposed are high-frequency displacement rate acceleration and deceleration ( Mortimer et al., 2005 ) recorded by clinoform nucleation. Possible second
Journal Article

Evolution of the margin of the Gulf of California near Loreto, Baja California Peninsula, Mexico

Paul J. Umhoefer, Larry Mayer, Rebecca J. Dorsey
Journal: GSA Bulletin
Published: 01 July 2002
GSA Bulletin (2002) 114 (7): 849–868.
DOI: https://doi.org/10.1130/0016-7606(2002)114<0849:EOTMOT>2.0.CO;2
... was structurally segmented in the protogulf stage and then complexly overprinted by transtensional structures that suggest one type of process for initiating transform faults. The Loreto segment is 85 km long along the rift and is bounded on the west by a discontinuous series of aligned, down-to-the-east...
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Journal Article

Tectonic and eustatic controls on sequence stratigraphy of the Pliocene Loreto basin, Baja California Sur, Mexico

Rebecca J. Dorsey, Paul J. Umhoefer
Journal: GSA Bulletin
Published: 01 February 2000
GSA Bulletin (2000) 112 (2): 177–199.
DOI: https://doi.org/10.1130/0016-7606(2000)112<177:TAECOS>2.0.CO;2
...Rebecca J. Dorsey; Paul J. Umhoefer Abstract The Loreto basin formed by rapid westward tilting and asymmetric subsidence within a broad releasing bend of the Loreto fault during transtensional deformation along the western margin of the active Gulf of California plate boundary. Sedimentary rocks...
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Earthquake clustering inferred from Pliocene Gilbert-type fan deltas in the Loreto basin, Baja California Sur, Mexico

Rebecca J. Dorsey, Paul J. Umhoefer, Peter D. Falk
Journal: Geology
Published: 01 August 1997
Geology (1997) 25 (8): 679–682.
DOI: https://doi.org/10.1130/0091-7613(1997)025<0679:ECIFPG>2.3.CO;2
...Rebecca J. Dorsey; Paul J. Umhoefer; Peter D. Falk Abstract A stacked sequence of Pliocene Gilbert-type fan deltas in the Loreto basin was shed from the footwall of the dextral-normal Loreto fault and deposited at the margin of a marine basin during rapid fault-controlled subsidence. Fan-delta...
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Figure 13. Equal-area plots of structural data from the Loreto basin. With ...

Published: 01 February 2000
Figure 13. Equal-area plots of structural data from the Loreto basin. With the exceptions noted here, dots are poles to bedding; great circles are fault planes; ball and arrow symbols on great circles are the trend and plunge of striae and the relative motion of the hanging wall. Extension (T
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Gulf of California and Loreto rift segment. A: Topography of Loreto rift se...

Published: 01 March 2014
Figure 1. Gulf of California and Loreto rift segment. A: Topography of Loreto rift segment, showing Loreto segment faults (black), relict landscape (orange overlay), Loreto basin (brown) east of Loreto fault, piedmont granodiorite exposures (red), beheaded canyons (blue stars), piedmont lava
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Figure 4. Proposed drainage reorganization and evolution in response to foo...

Published: 01 July 2007
Figure 4. Proposed drainage reorganization and evolution in response to footwall uplift during an increase in displacement rate on the Loreto fault (see text for discussion).
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Shaded relief map indicating the locations on the Baja California peninsula...

Published: 06 December 2017
. The sources are provided in the text. L, Loreto fault; E, Escondido fault; GT, Guaymas transform fault; GB, Guaymas basin; CT, Carmen transform fault; CB, Carmen basin; FT, Farallon transform fault; FB, Farallon basin; PT, Pescadero transform fault; PB, Pescadero basin.
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Figure 2. (A) Geologic map of the Loreto basin, showing distribution of pre...

Published: 01 February 2000
Figure 2. (A) Geologic map of the Loreto basin, showing distribution of pre-Pliocene rocks, Pliocene sedimentary formations and stratigraphic sequences (1–4), and major structures. The central subbasin comprises Pliocene strata located northeast of the Loreto fault, west of the Sierra Microondas
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Figure 5. Four serial cross sections through the Loreto segment selected to...

Published: 01 July 2002
. The graben offshore in A–A′ (profile 2) is taken from Nava-Sanchez et al. (2001) . Note that all of the boundary structures are extensional monoclines or monoclines cut by normal faults. The Loreto fault is the only known major strike-slip fault in the region.
Image

Figure 1. (A) Regional tectonic setting of the Gulf of California and the B...

Published: 01 February 2000
geologic map of the Loreto region in Baja California Sur. Black areas represent Pliocene sedimentary rocks. BC—Bahia Concepcion; LF—Loreto fault; MVC—Mencenares volcanic complex (Pliocene–Quaternary); Mv—Miocene volcanic rocks; Mv/Ms—Miocene volcanic and sedimentary rocks; PE—Puerto Escondido; Qs
Image

Figure 14. Interpretive three-stage evolution of central subbasin (cross-se...

Published: 01 February 2000
Figure 14. Interpretive three-stage evolution of central subbasin (cross-section view), in which basin subsidence is controlled by growth of hanging-wall collapse syncline (sequence 1 and 2), followed by slowing of slip on Loreto fault, initiation of coastal fault in the east, and uplift
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Map of the plate boundary in the southern Gulf of California showing the fe...

Published: 12 February 2020
domains of the eastern boundary zone. Red triangles are the global positioning system (GPS) sites of this study. Ca—Carmen Island; Ce—Cerralvo Island; Cf—Carrizal fault; Ecf—Escondido fault; ES—Espiritu Santo Island; ESf—Espiritu Santo fault; Gf—La Gata fault; Lf—Loreto fault; SCf—San Jose del Cabo fault
Journal Article

Rift flank uplift at the Gulf of California: No requirement for asthenospheric upwelling

Chris Mark, Sanjeev Gupta, Andy Carter, Darren F. Mark, Cécile Gautheron, Arturo Martín
Journal: Geology
Published: 01 March 2014
Geology (2014) 42 (3): 259–262.
DOI: https://doi.org/10.1130/G35073.1
...Figure 1. Gulf of California and Loreto rift segment. A: Topography of Loreto rift segment, showing Loreto segment faults (black), relict landscape (orange overlay), Loreto basin (brown) east of Loreto fault, piedmont granodiorite exposures (red), beheaded canyons (blue stars), piedmont lava...
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Journal Article

The Historical Seismicity of the Loreto Region, Baja California Peninsula, Mexico (1684–1878)

Max Suter
Published: 06 December 2017
Seismological Research Letters (2018) 89 (1): 202–209.
DOI: https://doi.org/10.1785/0220170204
.... The sources are provided in the text. L, Loreto fault; E, Escondido fault; GT, Guaymas transform fault; GB, Guaymas basin; CT, Carmen transform fault; CB, Carmen basin; FT, Farallon transform fault; FB, Farallon basin; PT, Pescadero transform fault; PB, Pescadero basin. ...
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Journal Article

Quantifying rates of “rifting while drifting” in the southern Gulf of California: The role of the southern Baja California microplate and its eastern boundary zone

Paul J. Umhoefer, C. Plattner, R. Malservisi
Journal: Lithosphere
Publisher: GSW
Published: 12 February 2020
Lithosphere (2020) 12 (1): 122–132.
DOI: https://doi.org/10.1130/L1132.1
... domains of the eastern boundary zone. Red triangles are the global positioning system (GPS) sites of this study. Ca—Carmen Island; Ce—Cerralvo Island; Cf—Carrizal fault; Ecf—Escondido fault; ES—Espiritu Santo Island; ESf—Espiritu Santo fault; Gf—La Gata fault; Lf—Loreto fault; SCf—San Jose del Cabo fault...
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Tectonics of the Pliocene Loreto basin, Baja California Sur, Mexico, and evolution of the Gulf of California

Paul J. Umhoefer, Rebecca J. Dorsey, Paul Renne
Journal: Geology
Published: 01 July 1994
Geology (1994) 22 (7): 649–652.
DOI: https://doi.org/10.1130/0091-7613(1994)022<0649:TOTPLB>2.3.CO;2
... at ∼3.5 Ma, at which time the zone of transform-related deformation widened to initiate formation of the Loreto basin. The major change in the Loreto basin at 2.46 Ma may be coeval with the beginning of faulting in southern California on the Elsinore and San Jacinto faults. These widespread events may...
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Figure 12. Our model for the evolution of the Loreto region. The present sh...

Published: 01 July 2002
Figure 12. Our model for the evolution of the Loreto region. The present shoreline from Bahía Concepción to Bahía Agua Verde ( Fig. 4 ) is shown in each stage. The large two-sided arrows are the average extension direction for each time interval from this study. Solid lines are faults