Areal geology of the western Mojave Desert, California

Dibblee, T.W.

doi:10.3133/pp522

Cited by 114 publications

(130 citation statements)

References 7 publications

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“…The sites lie along the part of the fault that last ruptured in the 1857 Fort Tejon earthquake. Throughout the western Mojave desert, Tertiary formations rest unconformably upon a surface of pre-Tertiary crystalline rocks that underwent deep erosion during late Cretaceous and early Tertiary time [Dibblee, 1967]. In middle to late Miocene time the Mojave block was deformed primarily by normal faulting along northwest trending faults [Dibblee, 1967].…”

Section: Mojave Desert Wellsmentioning

confidence: 99%

“…Throughout the western Mojave desert, Tertiary formations rest unconformably upon a surface of pre-Tertiary crystalline rocks that underwent deep erosion during late Cretaceous and early Tertiary time [Dibblee, 1967]. In middle to late Miocene time the Mojave block was deformed primarily by normal faulting along northwest trending faults [Dibblee, 1967]. Geologic and paleomagnetic studies indicate that as much as 10% north-south shortening of the wedge between the Garlock and San Andreas faults may have occurred during the Pliocene and Quaternary [Ponti and Burke, 1979].…”

Section: Mojave Desert Wellsmentioning

confidence: 99%

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Distribution of natural fractures and joints at depth in crystalline rock

1983

International Journal of Rock Mechanics and Mining Sciences &am

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This paper presents the results of studies of the natural fracture distribution encountered in 10 test wells drilled in three areas of the United States. Seven of the wells were drilled to depths of 200-250 m, while three were drilled to depths of about 1 kin. Using an ultrasonic borehole televiewer, fracture depths, strikes, and dips were determined. Steeply dipping fractures were found throughout each of the wells, and in general, few horizontal fractures were observed. Statistically significant fracture pole concentrations were found for each well which were basically invariant with depth, although some variation of fracture orientation with depth was found in two wells. The significant fracture orientations were not found to be the same in wells only several kilometers apart in a given region. In none of the wells did the number of observable fractures decrease markedly with increasing depth. No simple relationship of fracture orientation or fracture density with major structural features such as the San Andreas fault were observed, and no simple relation between the significant fracture orientations and either past or present regional stress fields could be determined.

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Section: Mojave Desert Wellsmentioning

confidence: 99%

Section: Mojave Desert Wellsmentioning

confidence: 99%

Distribution of natural fractures and joints at depth in crystalline rock

1983

International Journal of Rock Mechanics and Mining Sciences &am

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“…The alluvium consists of unconsolidated to moderately indurated, poorly sorted materials with the older, deeper units being more compacted and indurated than the younger shallow units (Dutcher and Worts 1963;Durbin 1978). The fine-grained lacustrine clay deposits consist of interbedded sands, silts, and clays that have accumulated in a large lake that periodically covered large parts of the valley center (Dibblee 1967;Orme 2003). These lacustrine deposits consist primarily of thick layers of a blue-green silty clay and a brown clay which contains interbedded sands and silts.…”

Section: Hydrogeologymentioning

confidence: 99%

Natural recharge estimation and uncertainty analysis of an adjudicated groundwater basin using a regional-scale flow and subsidence model (Antelope Valley, California, USA)

2015

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Groundwater has provided 50-90 % of the total water supply in Antelope Valley, California (USA). The associated groundwater-level declines have led the Los Angeles County Superior Court of California to recently rule that the Antelope Valley groundwater basin is in overdraft, i.e., annual pumpage exceeds annual recharge. Natural recharge consists primarily of mountain-front recharge and is an important component of the total groundwater budget in Antelope Valley. Therefore, natural recharge plays a major role in the Court's decision. The exact quantity and distribution of natural recharge is uncertain, with total estimates from previous studies ranging from 37 to 200 gigaliters per year (GL/year). In order to better understand the uncertainty associated with natural recharge and to provide a tool for groundwater management, a numerical model of groundwater flow and land subsidence was developed. The transient model was calibrated using PEST with water-level and subsidence data; prior information was incorporated through the use of Tikhonov regularization. The calibrated estimate of natural recharge was 36 GL/year, which is appreciably less than the value used by the court (74 GL/year). The effect of parameter uncertainty on the estimation of natural recharge was addressed using the Null-Space Monte Carlo method. A Pareto trade-off method was also used to portray the reasonableness of larger natural recharge rates. The reasonableness of the 74 GL/year value and the effect of uncertain pumpage rates were also evaluated. The uncertainty analyses indicate that the total natural recharge likely ranges between 34.5 and 54.3 GL/year.

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“…The main geomorphological units are the southern Sierra Nevada north of the Garlock Fault, the Transverse Ranges west of the San Andreas Fault and the flatlands of the western Mojave Desert. According to Dibblee Jr. (1967), the area is composed mainly of crystalline pre-Tertiary rocks, Tertiary sedimentary and volcanic rocks and Quaternary sediments and local basaltic flows. …”

Section: Study Areamentioning

confidence: 99%

SRTM resample with short distance‐low nugget kriging

Grohmann

Steiner

2008

International Journal of Geographical Information Science

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Abstract. The Shuttle Radar Topography Mission (SRTM), was flow on Space Shuttle Endeavour in February 2000, with the objective of acquire a digital elevation model of all land between 60 • north latitude and 56 • south latitude, using Interferometric Synthetic Aperture Radar (InSAR) techniques. SRTM data is distributed at horizontal resolution of 1 arc-second (aprox. 30m) for areas within the USA and at 3 arc-second (aprox. 90m) resolution for the rest of the world. A resolution of 90m can be considered suitable for small or medium-scale analysis, but it is too coarse for more detailed purposes. One alternative is to interpolate the SRTM data at a finer resolution; it won't increase the level of detail of the original DEM, but it will lead to a surface where there is coherence of angular properties (i.e., slope, aspect) between neighbouring pixels, an important characteristic when dealing with terrain analysis. This work intents to show how the proper adjustment of variogram and kriging parameters, namely the nugget effect and the maximum distance within which values are used in interpolation, can be set to achieve quality results on resampling SRTM data from 3" to 1". We present for a test area in western USA, which include different adjustment schemes (changes in nugget effect value and in the interpolation radius) as well as comparisons with the original 1" model of the area, with the National Elevation Dataset DEMs, and with other interpolation methods (splines and IDW). The basic concepts for using kriging to resample terrain data are: 1) to work only with the immediate neighbourhood of the predicted point, due the high spatial correlation of the topographic surface and omnidirectional behaviour of variogram in short distances; 2) add a very small random variation to the coordinates of the points prior to interpolation, to avoid punctual artifacts generated by predicted points with the same location than original data points and 3) use a small value of nugget effect, to avoid smoothing that can obliterate terrain features. Drainages derived from the surfaces interpolated by kriging and by splines have good agreement with streams derived from the 1" NED, with correct identification of watersheds, even though a few differences occur in the positions of some rivers in flat areas. Although the 1" surfaces resampled by kriging and splines are very similar, we consider the results produced by kriging as superior, since the spline-interpolated surface still presented some noise and linear artifacts, which were removed by kriging.

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Areal geology of the western Mojave Desert, California

Cited by 114 publications

References 7 publications

Distribution of natural fractures and joints at depth in crystalline rock

Distribution of natural fractures and joints at depth in crystalline rock

Natural recharge estimation and uncertainty analysis of an adjudicated groundwater basin using a regional-scale flow and subsidence model (Antelope Valley, California, USA)

SRTM resample with short distance‐low nugget kriging

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