Source Functions and Path Effects from Earthquakes in the Farallon Transform Fault Region, Gulf of California, Mexico that Occurred on October 2013

2017 ◽  
pp. 45-62
Author(s):  
Raúl R. Castro ◽  
Joann M. Stock ◽  
Egill Hauksson ◽  
Robert W. Clayton
Keyword(s):  
Gulf Of California ◽  
Transform Fault ◽  
Fault Region

Source Functions and Path Effects from Earthquakes in the Farallon Transform Fault Region, Gulf of California, Mexico that Occurred on October 2013

2016 ◽  
Vol 174 (6) ◽  
pp. 2239-2256 ◽  
Author(s):  
Raúl R. Castro ◽  
Joann M. Stock ◽  
Egill Hauksson ◽  
Robert W. Clayton
Keyword(s):  
Gulf Of California ◽  
Transform Fault ◽  
Fault Region

scholarly journals Trophic structure of the macrofauna associated to deep-vents of the southern Gulf of California: Pescadero Basin and Pescadero Transform Fault

PLoS ONE ◽  
2019 ◽  
Vol 14 (11) ◽  
pp. e0224698 ◽  
Author(s):  
Diana L. Salcedo ◽  
Luis A. Soto ◽  
Jennifer B. Paduan
Keyword(s):  
Gulf Of California ◽  
Trophic Structure ◽  
Transform Fault

The Tamayo transform fault in the mouth of the Gulf of California

1979 ◽  
Vol 4 (2) ◽  
pp. 129-151 ◽  
Author(s):  
K. A. Kastens ◽  
K. C. Macdonald ◽  
K. Becker ◽  
K. Crane
Keyword(s):  
Gulf Of California ◽  
Transform Fault

Earthquake source mechanisms and transform fault tectonics in the Gulf of California

1987 ◽  
Vol 92 (B10) ◽  
pp. 10485-10510 ◽  
Author(s):  
John A. Goff ◽  
Eric A. Bergman ◽  
Sean C. Solomon
Keyword(s):  
Gulf Of California ◽  
Earthquake Source ◽  
Transform Fault ◽  
Fault Tectonics ◽  
Source Mechanisms

Coexisting seismic behavior of transform faults revealed by high-resolution bathymetry

Geology ◽  
2020 ◽  
Vol 48 (4) ◽  
pp. 379-384
Author(s):  
G.E. Hilley ◽  
R.M. Sare ◽  
F. Aron ◽  
C.W. Baden ◽  
D.W. Caress ◽  
...  
Keyword(s):  
High Resolution ◽  
Gulf Of California ◽  
Slope Failure ◽  
Autonomous Underwater Vehicle ◽  
Transform Fault ◽  
Zone Structure ◽  
Transform Faults ◽  
Small Magnitude ◽  
Slip History ◽  
High Resolution Bathymetry

Abstract Transform faults have anomalously low rates of seismicity, but it’s not clear whether this reflects persistent earthquake-generating fault patches surrounded by creep, or the presence of creep and earthquakes at different times along the same patch. We use new, autonomous underwater vehicle high-resolution seafloor mapping to image the morphology of and offsets along transform fault segments in the Gulf of California, offshore Mexico. Fault zone structure imaged in this study shows evidence for the initiation and cessation of activity along individual fault splays over geologic time. A series of six identically offset depositional fans evidence 21–23 m of slip along the main transform fault, which could not have been produced by a single earthquake given the length of the transform. Rather, the lack of smaller-magnitude offsets indicates synchronous deposition and an absence of multiple slope failure–inducing earthquakes, which is consistent with the idea that creep and/or small-magnitude events occur asynchronously with large earthquakes in the slip history of a given transform fault segment.

The 4 January 2006 (Mw 6.6), San Pedro Martir Earthquake: Example of an Earthquake for Calibrating Excitation and Attenuation Studies

2019 ◽  
Vol 109 (6) ◽  
pp. 2399-2414 ◽  
Author(s):  
Luis Quintanar ◽  
Roberto Ortega ◽  
Héctor E. Rodríguez‐Lozoya ◽  
Tonatiuh Domínguez‐Reyes
Keyword(s):  
Gulf Of California ◽  
Moment Tensor ◽  
Near Field ◽  
Scaling Law ◽  
Rate Function ◽  
Transform Fault ◽  
High Frequencies ◽  
Stress Parameter ◽  
Rupture Area ◽  
San Pedro

Abstract An earthquake of magnitude 6.6 occurred on 4 January 2006, at 28.081° N and 112.381° W along a transform fault that joins the San Pedro Martir and the Guaymas basins in the Gulf of California extensional province. We located 17 foreshocks and 38 aftershocks. The foreshocks occurred on a fault perpendicular to the transform fault, where the main event occurred. The aftershocks were located along a fault length of approximately 18 km with a northwest–southeast trend. The average Brune static stress drop of the San Pedro Martir event was 8 MPa. From a time‐domain moment tensor inversion, we obtained the fault geometry given by strike of 129°±1°, dip of 86°±4°, and rake of 168°±12°, which was constrained to have a nonisotropic component and a source depth of 6±2  km. We used the inversion code from Yagi et al. (1999) to invert near field and teleseismic P waves to obtain the spatial slip distribution over the fault. The event had a single source and a moment rate function (MRF) displaying a triangular shape with a duration of 12 s. The rupture propagated toward the northwest from the hypocenter over a rupture area of 28×12  km2 with a maximum slip displacement of 2.3 m and a seismic moment of 8.79×1018  N·m. The directivity confirmed that the rupture propagated from the southeast to the northwest. Few aftershocks were located in the rupture area obtained from the inversion. Most aftershocks occurred toward the southeast of the epicenter. All these source analyses were performed to have a well‐calibrated excitation term for future regional modeling of ground‐motion parameters. The magnitudes of the foreshocks preceding this peculiar earthquake were higher than those of the aftershocks. Our results show that earthquakes with magnitudes of five or higher present a simple and self‐scaling law using a constant stress parameter, but for earthquakes with magnitudes lower than five, the high frequencies are depleted, and the earthquake can be replicated by a low‐stress parameter of 0.28 MPa. We also observed that the aftershocks and foreshocks differ in their frequency content. Although the foreshocks follow Brune’s omega‐squared source term, the aftershocks have larger contents of high frequencies.

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