Electrical conductivity images of Quaternary faults and Tertiary detachments in the California Basin and Range

Park, Stephen K.; Wernicke, Brian P.

doi:10.1029/2001tc001324

Cited by 26 publications

(30 citation statements)

References 59 publications

(68 reference statements)

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“…Magnetotelluric studies by PARK (2004) and PARK and WERNICKE (2003) ? represents the location of the available heat flow data (BLACKWELL and RICHARDS 2004) an electrical resistivity section to a geologic section extending across eastern California including Death Valley.…”

Section: Tectonic and Geophysical Settingmentioning

confidence: 99%

Curie Point Depth Estimates from Aeromagnetic Data from Death Valley and Surrounding Regions, California

Hussein

Mickus

Serpa

2012

Pure Appl. Geophys.

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Aeromagnetic data were analyzed to determine the Curie point depth (CPD) by power density spectral and threedimensional inversion methods within and surrounding Death Valley in southern California. We calculated the CPD for 0.5°r egions using 2D power density spectral methods and found that the CPDs varied between 8 and 17 km. However, the 0.5°region may average areas that include shallow and deep CPDs, and because of this limitation, we used the 3D inversion method to determine if this method may provide better resolution of the CPDs. The final 3D model indicates that the depth to the bottom of the magnetic susceptible bodies varies between 5 and 23 km. Even though both methods produced roughly similar results, the 3D inversion method produced a higher lateral resolution of the CPDs. The shallowest CPDs occur within the central and southern Death Valley, Panamint Valley, Coso geothermal field and the Tecopa hot springs region. Deeper ([15 km) CPDs occur over outcropping granitic and Precambrian lithologies in the Panamint Range, Grapevine Mountains, Black Mountains and the Argus Range. The shallowest CPD occurs within the central Death Valley over a possible seismically imaged magma body and slightly deeper values occur within the Panamint Valley, southern Death Valley and Tecopa Hot Springs. The shallow CPD values suggest that partially molten material may also be found in these latter regions. The CPD computed heat flow values for the region suggest that the entire area has high heat flow values ([100 mW m -2 ), on the other hand, locally extremely high values ([200 mW m -2 ) occur within the Panamint Valley, the southern and central Death Valley and Tecopa Hot Springs region. These locally high heat flow values may be related to midcrustal magma bodies; but additional geophysical experiments are needed to determine if the magma bodies exist.

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Section: Tectonic and Geophysical Settingmentioning

confidence: 99%

Curie Point Depth Estimates from Aeromagnetic Data from Death Valley and Surrounding Regions, California

Hussein

Mickus

Serpa

2012

Pure Appl. Geophys.

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“…In the Death Valley region, the CFM includes alternative fault representations derived from different tectonic models that emphasize extensional detachments or strike-slip faults (Machette et al, 2001;Park and Wernicke, 2003). Between the Death Valley region and the SAF, the White Wolf fault and associated faults are based on models of the 1952 Kern County (M 7.5) earthquake as well as more recent seismicity (Bawden et al, 1999;Bawden, 2001).…”

Section: Model Descriptionmentioning

confidence: 99%

Community Fault Model (CFM) for Southern California

Plesch¹,

Shaw²,

Benson³

et al. 2007

Bulletin of the Seismological Society of America

219

230

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We present a new three-dimensional model of the major fault systems in southern California. The model describes the San Andreas fault and associated strikeslip fault systems in the eastern California shear zone and Peninsular Ranges, as well as active blind-thrust and reverse faults in the Los Angeles basin and Transverse Ranges. The model consists of triangulated surface representations (t-surfs) of more than 140 active faults that are defined based on surfaces traces, seismicity, seismic reflection profiles, wells, and geologic cross sections and models. The majority of earthquakes, and more than 95% of the regional seismic moment release, occur along faults represented in the model. This suggests that the model describes a comprehensive set of major earthquake sources in the region. The model serves the Southern California Earthquake Center (SCEC) as a unified resource for physics-based fault systems modeling, strong ground-motion prediction, and probabilistic seismic hazards assessment.

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“…However, a resistivity image does not only reflect the porosity or the presence of the fluid but also provides information regarding in situ temperature or lithology. Thus, the resistivity boundaries often represent geological boundaries (e.g., Park and Wernicke, 2003).…”

Section: Introductionmentioning

confidence: 99%

Resistivity structure around the focal area of the 2004 Rumoi-Nanbu earthquake (M 6.1), northern Hokkaido, Japan

et al. 2008

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The Rumoi-Nanbu earthquake (M 6.1) occurred in northern Hokkaido, Japan, on December 14, 2004. We conducted MT surveys along three profiles in and around the focal area to delineate and decipher the structural features of the seismogenic zone. The inverted 2-D resistivity images of the three sections comprised two layers: an upper conductive layer and a lower resistive layer. The boundary of these layers lay at a depth of approximately 3-5 km. A comparison with the surface geology and drilling data revealed that the upper conductive layer and the lower resistive layer corresponded to the Cretaceous-Tertiary sedimentary rocks and older basement rocks, respectively. A clear upheaval of the layer boundary was found along the profile at the center of the focal area. In addition, borehole data indicated an obvious increase in the Young's modulus toward the lower layer. Therefore, the elastic properties with a complex geometry around the focal zone tended to vary; this probably depicts the zone of stress accumulation that triggered the earthquake.

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Electrical conductivity images of Quaternary faults and Tertiary detachments in the California Basin and Range

Cited by 26 publications

References 59 publications

Curie Point Depth Estimates from Aeromagnetic Data from Death Valley and Surrounding Regions, California

Curie Point Depth Estimates from Aeromagnetic Data from Death Valley and Surrounding Regions, California

Community Fault Model (CFM) for Southern California

Resistivity structure around the focal area of the 2004 Rumoi-Nanbu earthquake (M 6.1), northern Hokkaido, Japan

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