Petrologic model of the northern Mississippi Embayment based on satellite magnetic and ground-based geophysical data

Thomas, H. H.

doi:10.1016/0012-821x(84)90214-0

Cited by 11 publications

(5 citation statements)

References 26 publications

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“…The following values for magnetic susceptibilities are used (see Fig. 9): 0.058 SI for the oceanic slab, and 0.013 SI for the continental crust (Nagata, 1969;Thomas, 1984). To fit the magnetic model with the observed anomaly we also included the effect of the Tuxtla alkaline basalts, using a 3 km thick layer with a high magnetic susceptibility of 0.19 SI.…”

Section: Configuration Of the Plate Interfacementioning

confidence: 99%

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

et al. 2005

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The aseismic slow slip event of [2001][2002] in Guerrero, Mexico, with an equivalent magnitude M W ∼ 7.5, is the largest silent earthquake (SQ) among many recently recorded by GPS in different subduction zones (i.e. Japan, Alaska, Cascadia, New Zealand). The sub-horizontal and shallow plate interface in Central Mexico is responsible for specific conditions for the ∼100 km long extended transient zone where the SQs develop from ∼80 to ∼190 km inland from the trench. This wide transient zone and relatively large slow slips of 10 to 20 cm displacements on the subduction fault result in noticeable surface displacements of 5-6 cm during the SQs. Continuous GPS stations allow one to trace the propagation of SQs, and to estimate their arrival time, duration and geometric attenuation. These propagation parameters must be accounted in order to locate source of slow slips events and to understand the triggering effect that they have on large subduction earthquakes. We use longbaseline tiltmeter data to define new time limits This modeling shows that the SQ ceased gradually in the central part of the Oaxaca segment of the subduction zone (west of Puerto Angel, PUAN) and then it apparently triggered another SQ in SE Oaxaca (between PUAN and Salina Cruz, SACR). The estimated horizontal velocities for inter-event epochs at each GPS site are used to assess an average interplate coupling in the Central Oaxaca subduction zone.

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Section: Configuration Of the Plate Interfacementioning

confidence: 99%

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

et al. 2005

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“…Meanwhile, Schnetzler [1984, andpersonal communication, 1984] compared measured coastal anomalies of shorter wavelength with those predicted from model studies and found the data to be statistically consistent with the models. Thomas [1984] derived a petrologic model of the northern Mississippi Embayment from gravity, seismic, and rift data.…”

Section: One Puzzling Characteristic Of Satellite Magnetic Anomaly Mamentioning

confidence: 93%

Introduction to the Special Issue: A Perspective on Magsat Results

Langel¹

1985

J. Geophys. Res.

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It is now over 4 years since the Magsat spacecraft reentered the earth's atmosphere. By almost any measure the project has been a success: launch was within budget and on time; the data acquired exceeded prelaunch quality requirements even though the instrumentation encountered some problems; with the publication of this issue, the number of related scientific papers is near 100. Magsat project objectives were (1) to obtain accurate vector measurements of the near‐earth geomagnetic field and (2) to use those measurements to identify and model the main (core) and crustal fields. The main field measurements were to be used for the 1980 world charts and for studies of earth's core. The crustal field estimates were to be utilized to aid in modeling large‐scale variations in the geologic and geophysical characteristics of the crust. Although not a primary Magsat objective, studies of fields from external sources were also carried out.

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“…They decay with altitude below the noise level of satellite data to the extent that at satellite altitudes a typical oceanic lithosphere cannot be distinguished from a nonmagnetic horizontal layer as far as its NRM is concerned. 1984;Johnson 1985;Frey 1985;Bradley & Frey 1988;Fullerton et al 1989;Toft & Arkani-Hamed 1992, 1993. The magnetization acquired by the lithosphere during the long normal polarity of the core field in the Cretaceous, produces appreciable magnetic signature at satellite altitudes (LaBrecque & Raymond 1985;Toft & Arkani-Hamed 1992).…”

Section: Removal Of the Core-field Componentsmentioning

confidence: 98%

“…Many of the anomalies have been related to known geologic features and their source bodies have quantitatively been modelled (e.g. Regan & Marsh 1982;Langel & Thorning 1982;Mayhew 1985;von Frese, Hinzel & Braile 1982;Schnetzler & Allenby 1983;Thomas 1984;Arkani-Hamed, Urquhart & Strangway 1984;Clark, Frey & Thomas 1985;Harrison, Carle & Hayling 1989;Fullerton et al 1989;Singh, Rajaram & Basavaiah 1989; see also the special issue of Geophysical Research Letters, 1982, 9, and the special issue of Journal of Geophysical Research 1985, 90, (B)). However, n o distinct magnetic signature is associated with the ocean-continent boundary except for a few locations.…”

Section: Introductionmentioning

confidence: 99%

The bulk magnetization contrast across the ocean-continent boundary in the east coast of North America

Arkani‐Hamed

1993

Geophysical Journal International

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S U M M A R YThe intermediate wavelength (-600-3000 km) magnetic anomalies of Earth derived from satellite data, indicate that both continental crust and oceanic lithosphere are magnetic. However, no well defined and consistent magnetic anomaly is associated with the ocean-continent boundary, emphasizing that the bulk magnetization (the vertically integrated magnetization) contrast of oceanic lithosphere and continental crust is not appreciable. An upper limit of -37000A is estimated for the bulk magnetization contrast using the low-altitude aeromagnetic and marine magnetic data from across the east coast of North America.

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Petrologic model of the northern Mississippi Embayment based on satellite magnetic and ground-based geophysical data

Cited by 11 publications

References 26 publications

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

Propagation of the 2001–2002 silent earthquake and interplate coupling in the Oaxaca subduction zone, Mexico

Introduction to the Special Issue: A Perspective on Magsat Results

The bulk magnetization contrast across the ocean-continent boundary in the east coast of North America

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