Four-dimensional analysis of the inversion of a half-graben to form the Whittier fold–fault system of the Los Angeles basin

Bjorklund, Tom; Burke, Kevin

doi:10.1016/s0191-8141(01)00147-x

Cited by 13 publications

(10 citation statements)

References 30 publications

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“…In Fig. S9 in the Supporting Information, we in addition show a geological profile that is close to A-A (E-E in Wright 1991) for comparison, and a detailed profile around the Puente Hills can be found in Bjorklund & Burke (2002) (C-C therein). Note that, the S-wave velocity in CVM-H is largely inferred from the P-wave velocity from the oil industry, and therefore, shows a lot of detail that it inherits from V P .…”

Section: The Shear Velocitiesmentioning

confidence: 99%

“…5b) results in the top 3 km are similar, except at the distance range larger than 32 km (north of the Puente Hills) where V SH is considerably (∼0.5 km s −1 ) higher than V SV . The high V SH can be related with the thrusting basement rocks along the Whittier fault (Bjorklund & Burke 2002). From an oil-company survey in the western Puente Hills, the Puente Hills are underlain by an aggregate of about 5 km of Cenozoic rocks which overlies a Mesozoic basement of granitoid plutonic rocks that contain a large pendant of foliated greenschist (Yerkes 1972).…”

Section: The Shear Velocitiesmentioning

confidence: 99%

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Structure of the Los Angeles Basin from ambient noise and receiver functions

Ma¹,

Clayton²

2016

Geophys. J. Int.

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S U M M A R YA velocity (Vs) and structure model is derived for the Los Angeles Basin, California based on ambient-noise surface wave and receiver-function analysis, using data from a low-cost, short-duration, dense broad-band survey (LASSIE) deployed across the basin. The shear wave velocities show lateral variations at the Compton-Los Alamitos and the Whittier Faults. The basement beneath the Puente Hills-San Gabriel Valley shows an unusually high velocity (∼4.0 km s −1 ) and indicates the presence of schist. The structure of the model shows that the basin is a maximum of 8 km deep along the profile and that the Moho rises to a depth of 17 km under the basin. The basin has a stretch factor of 2.6 in the centre grading to 1.3 at the edges and is in approximate isostatic equilibrium.

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Section: The Shear Velocitiesmentioning

confidence: 99%

Section: The Shear Velocitiesmentioning

confidence: 99%

Structure of the Los Angeles Basin from ambient noise and receiver functions

Ma¹,

Clayton²

2016

Geophys. J. Int.

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“…On the front face of the 3D block, red arrows mark the maximum horizontal stress orientation at shallow and midcrustal depths. The right face is the projection of Figure 6b, with the addition of the Puente Hills anticline fold (Bjorklund and Burke, 2002; green curves), the Whittier fault (black line), and the faults of the Puente Hills blind-thrust system (orange lines). The PHT system is also marked on the front face.…”

Section: In the 1999mentioning

confidence: 99%

“…The relative low b value at around 5-km depth could be associated with the presence of the PHT fault in the same depth range. The right side of the model shows the Puente Hills anticline fold (Bjorklund and Burke, 2002), together with the Whittier fault and faults of the Puente Hills blind-thrust fault system, stress drops, and earthquakes in latitude-depth profile. The dashed lines at the bottom of the model represent regional decollement with the lower crust below it.…”

Section: In the 1999mentioning

confidence: 99%

“…Based on the depth variations in stress drop, maximum compressional stress orientation, seismicity relationships, and previous work using geological and seismic refraction and reflection surveys in the ELA basin area (Fuis et al, 2001;Bjorklund and Burke, 2002;Shaw et al, 2002), we have assembled a 3D seismotectonic model as illustrated in Figure 8. The top of the model shows a map view of the ELA basin.…”

Section: In the 1999mentioning

confidence: 99%

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Evidence for Vertical Partitioning of Strike-Slip and Compressional Tectonics from Seismicity, Focal Mechanisms, and Stress Drops in the East Los Angeles Basin Area, California

Yang¹,

Hauksson²

2011

Bulletin of the Seismological Society of America

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We have synthesized the characteristics of the seismogenic zone in the east Los Angeles basin by analyzing earthquake data recorded during the past 30 years . The seismicity is distributed along the Whittier fault, with the majority of earthquakes located adjacent to the south side, in the depth range from 0 to 9 km, with b value of 1:1 0:05 and mostly normal and strike-slip faulting. Within the depth range of 9-12 km, the seismicity is scattered uniformly across the region, the b value is 1:0 0:05, and all three faulting styles are present. At the deepest depths (12-18 km), seismicity is sparse and primarily limited to a few clusters striking north; these deeper earthquakes primarily have reverse fault motion, and the b value is 0:78 0:04. Inversion of high-quality focal-mechanism data for the orientation of the regional stress field showed that the direction of maximum compressional stress rotates from N12°W at shallow depth to due north at the bottom of the seismogenic zone. Similarly, a depth dependence is observed in stress drops calculated from P-wave source spectra, which indicate stress drop generally increases from ∼7 MPa at shallow depth (3 km) to ∼53 MPa at the base of the seismogenic zone (17 km). Overall, our results provide new evidence for the vertical partitioning of styles of deformation and state of stress within this complex fault system in the east Los Angeles basin.Online Material: Stress drop fits to source spectra.

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Fault inversion vs. new thrust generation: A case study in the Malargüe fold-and-thrust belt, Andes of Argentina

Mescua¹,

Giambiagi²

2012

Journal of Structural Geology

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Four-dimensional analysis of the inversion of a half-graben to form the Whittier fold–fault system of the Los Angeles basin

Cited by 13 publications

References 30 publications

Structure of the Los Angeles Basin from ambient noise and receiver functions

Structure of the Los Angeles Basin from ambient noise and receiver functions

Evidence for Vertical Partitioning of Strike-Slip and Compressional Tectonics from Seismicity, Focal Mechanisms, and Stress Drops in the East Los Angeles Basin Area, California

Fault inversion vs. new thrust generation: A case study in the Malargüe fold-and-thrust belt, Andes of Argentina

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