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Showing 1 to 20 of 35 for “"Bouguer"”.
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Gravity profile evaluation of geological cross-sections through the Southern Appalachians in Frederick County, Virginia
… did not compare favorably with corresponding Bouguer gravity profiles. However, by modifying the geometry of the model units and adjusting the model unit densities, a reasonable fit between theoretical and Bouguer gravity profiles was obtained. Although the geometrical modifications adhered to …
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A high resolution gravity survey of the Lake St. Martin impact structure, Manitoba, Canada
… one of 23-km and one of 40-km. The residual Bouguer gravity from this study displays a concentric negative anomaly 40 km in diameter, a distinct change in amplitude approximately 23 km in diameter, and a positive anomaly over the central peak. </p><p> Data from six hundred and ninety-nine …
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Geophysical constraints on the flexural subsidence of the Denver Basin
… North American craton. A ~400 mGal negative Bouguer gravity anomaly exists over the Denver Basin and Front Range Uplift, with its minimum located over the highest topography in the central part of the uplift, approximately 100 km west of the Denver Basin. This study examines three hypotheses …
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A high resolution gravity survey for the detection of Pleistocene aquifers underlying the Fort Berthold Indian Reservation, North Dakota
… area range in thickness from 1 to 60 meters. The Bouguer gravity anomalies resulting from these shallow aquifers was estimated to be on the order of 1 to 2 mgals. Previous studies have focused on available well data and by mapping topographic lows. Due to the inferential nature of these studies, …
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Gravitational Study of the Hastings Salt Dome and Associated Faults in Brazoria and Galveston Counties,Texas
… elevation corrections (free-air correction and Bouguer correction), which is an important aspect of gravity correction in creation of a Bouguer Anomaly map. Bouguer Anomaly reveals lateral variation in density of rocks at the subsurface. Two oval gravity low anomalies were found and interpreted …
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ΓΕΩΦΥΣΙΚΗ ΔΙΑΣΚΟΠΗΣΗΣ ΤΗΣ ΠΕΡΙΟΧΗΣ "ΛΟΥΤΡΑΚΙΟΥ-ΣΟΥΣΑΚΙΟΥ"
… ΖΩΝΩΝ ΔΙΑΡΡΗΞΗΣ. ΕΡΜΗΝΕΥΟΝΤΑΙ ΟΙ ΑΝΩΜΑΛΙΕΣ BOUGUER ΚΑΙ ΔΙΝΕΤΑΙ ΧΑΡΤΗΣ ΙΣΟΒΑΘΩΝ ΤΗΣ ΕΠΙΦΑΝΕΙΑΣ ΑΣΥΝΕΧΕΙΑΣ ΠΥΚΝΟΤΗΤΑΣ ΚΑΘΩΣ ΕΠΙΣΗΣ ΕΝΤΟΠΙΖΟΝΤΑΙ ΖΩΝΕΣ ΔΙΑΡΡΗΞΗΣ ΤΗΣ ΠΕΡΙΟΧΗΣ. ΤΕΛΟΣ ΣΥΝΟΨΙΖΟΝΤΑΙ ΤΑ ΓΕΝΙΚΑΣΥΜΠΕΡΑΣΜΑΤΑ ΠΟΥ ΠΡΟΕΚΥΨΑΝ ΑΠΟ ΤΗΝ ΕΡΓΑΣΙΑ ΑΥΤΗ.
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The gravity field over the Bane Dome in Giles County, Virginia
The Bouguer gravity field, deterrmined from 395 measurements in Giles County, Virginia exhibits a broad positive anomaly approximately 12 mgal in amplitude situated over the Bane Dome, and several smaller anomalies of a few milligals amplitude. For the most part they are produced by the …
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A detailed gravity study over a known Devonian carbonate buildup: the Shell Golden Reef, northwestern North Dakota
… provided by the. analysis of the residual Bouguer gravity anomalies generated in this study indicate that the Shell Golden reef consists of a north-south trending elongate carbonate buildup rather than a pinnacle reef. The length of the elongated carbonate buildup is about 4.0 km both north …
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A Geophysical Study of the Easternmost Piedmont: Brunswick County, Virginia
… is a listric fault. A pronounced 3 to 5 mgal Bouguer anomaly high is associated with the fault zone. A band of N10° trending aeromagnetic anomalies delineate the areal extent of the fault zone. The fault zone flattens eastward over a short distance to a depth of 15 kms where it joins a near …
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The gravity field and plate boundaries in Venezuela
Free-air and simple Bouguer anomaly maps of the Venezuelan continental margin (from 60°W to 72°W and from 7°N to 13°N) are presented. The major features of the free-air map are: the large lows associated with the deep sedimentary basins, -200 mgal in the Eastern Venezuela basin and -164 mgal in the …
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The gravity field and plate boundaries in Venezuela
Free-air and simple Bouguer anomaly maps of the Venezuelan continental margin (from 60°W to 72°W and from 7°N to 13°N) are presented. The major features of the free-air map are: the large lows associated with the deep sedimentary basins, -200 mgal in the Eastern Venezuela basin and -164 mgal in the …
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Geologic framework of gravity anomaly sources in the central Piedmont of Virginia
Bouguer gravity anomalies at 1870 locations on the central Piedmont of Virginia from 37° 37' N to 37° 52' N and 77° 44' W to 78° 23' W display patterns of variation produced by upper crustal density contrasts and thickening of the crust in a WNW direction. No other deep sources are evident. Upper …
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Determination of coefficient of storage by use of gravity measurements.
… purpose may be accomplished by modifying the Bouguer slab equation to coefficient of storage equals 78.3 times the ratio of change in gravity in milligals to change in water-table elevation in feet. Errors which result from the Bouguer slab assumptions may be corrected through analysis of …
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Análisis de las sucesiones volcanoclásticas gondwano-patagonídicas del sector occidental de la comarca nordpatagónica, Argentina
… depocentros que generan anomalías negativas de Bouguer limitadas por lineamientos gravimétricos coincidentes con aquellos fotointerpretados y observados. Los depósitos de la Formación Garamilla se encuentran ubicados dentro de una zona de deformación de rumbo NNO-SSE, bordeada por lineamientos …
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Tertiary Sediments of the Big Hole Valley and Pioneer Mountains, Southwestern Montana: Age, Provenance, and Tectonic Implications
… Simple physical models developed from Bouguer anomalies indicate the basin deepens and widens toward the south, which agrees with prior work suggesting Eocene initiation of extension in the Big Hole and places it in a class of extensional basins that formed in the early Tertiary. Late …
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Tertiary Sediments of the Big Hole Valley and Pioneer Mountains, Southwestern Montana: Age, Provenance, and Tectonic Implications
… Simple physical models developed from Bouguer anomalies indicate the basin deepens and widens toward the south, which agrees with prior work suggesting Eocene initiation of extension in the Big Hole and places it in a class of extensional basins that formed in the early Tertiary. Late …
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Interactions between mantle plumes and mid-ocean ridges : constraints from geophysics, geochemistry, and geodynamical modeling
… Marion and Bouvet impart high-amplitude mantle Bouguer anomaly lows to the ridge axis, and suggest that long-offset transforms may diminish along-axis plume flow. Building upon this observation, Chapter 2 presents a series of 3D numerical models designed to quantify the sensitivity of along-axis …
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A geophysical investigation of a concealed granitoid beneath Lumberton, North Carolina
… supported by gravity data, which show a -35 mgal Bouguer gravity anomaly, and the relatively high heat flow of 63.4±5 mW/m² obtained in the drill hole, both of which are characteristic of Hercynian granitic plutons in the southeastern United States. Gravity modeling suggests that the body is …
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Interpretation of Potential Fields by Modern Data Processing and 3-dimensional gravity Modeling of the Dead Sea Pull-Apart Basin / Jordan Rift Valley (JRV)
… and free air anomaly and strong negative Bouguer anomaly under the central part of the Dead Sea Basin (DSB) and normal regional Bouguer anomaly outside of the DSB in the transform valley. Depth to the top of the bedrock in the under ground of Jordan was calculated from potential field …
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Proterozoic structures in north-central North Dakota: a gravity study
… southern Canada appear as coherent patterns on a Bouguer gravity map. </p><p> The contribution of the Phanerozoic overburden (density assumed to be 2 . 48 g cm- 3 ) to the gravity signal, was removed, leaving residual gravity anomalies due to density variations in the Precambrian basement. Four …
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