An efficient method for sending a large Seismic section from a mainframe computer to a dot matrix printer located at a remote site

Mereu, R. F.; Dunn, B.; Brunet, Jean-Paul

doi:10.1016/0040-1951(90)90213-r

Tectonophysics

1990

DOI: 10.1016/0040-1951(90)90213-r

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An efficient method for sending a large Seismic section from a mainframe computer to a dot matrix printer located at a remote site

R. F. Mereu

B. Dunn

Jean-Paul Brunet

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Cited by 2 publications

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“…The seismic sections were plotted using a special printerplotter program developed by Mereu et al [1990a]. We also reanalyzed the wide-angle seismic reflection data acquired from shotpoint G along refraction line GH which crosscuts both line 5 and the ILFZ (Figure 1).…”

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confidence: 99%

Crustal structure of the Kapuskasing uplift from Lithoprobe Near‐vertical/wide‐angle seismic reflection data

Wu¹,

Mereu²

1992

J. Geophys. Res.

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Reprocessing of one LITHOPROBE Kapuskasing deep seismic reflection profile discloses significant new information on the structure of the Kapuskasing Uplift (KU). The shallow structure of the Ivanhoe Lake fault zone (ILFZ), along which the high‐grade granulites of the KU were thrust to the surface, is conspicuously imaged on a seismic section as a series of prominent northwest‐dipping reflections with listric geometry. The new images show that the ILFZ is a steep fault (∼50°) near the surface which quickly flattens out at shallow depths. These reflections coincide with bright positive aeromagnetic anomalies over the fault zone. Direct correlation with geological observations indicates that the high reflectivity and high magnetism associated with the fault zone likely originate from mylonites. The reprocessing also reveals a pronounced midcrustal reflector within the Abitibi greenstone belt (AGB), dipping northwest and plunging under the KU. The existence of such a reflector is independently confirmed by wide‐angle reflection data acquired from a cross‐profile. This reflector is apparently also detected on two other reflection profiles crossing the ILFZ about 80 km to the southwest. Its concave‐down shape and broad lateral extent suggest that it represents underthrusting of the AGB beneath the KU. With these new results, a more complete structural cross‐section can be constructed. It shows that, on the northwest side, the KU was overthrust along the northwest‐dipping ILFZ and, on the southeast side, the AGB was underthrust northwesterly. It seems evident that the KU is a product of intraplate collision during the early Proterozoic and the underthrusting of the AGB is primarily responsible for the emplacement of the KU.

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mentioning

confidence: 99%

Crustal structure of the Kapuskasing uplift from Lithoprobe Near‐vertical/wide‐angle seismic reflection data

Wu¹,

Mereu²

1992

J. Geophys. Res.

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The Grenville Front Tectonic Zone: Results from the 1986 Great Lakes Onshore Seismic Wide‐Angle Reflection and Refraction Experiment

Epili¹,

Mereu²

1991

J. Geophys. Res.

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The Grenville Front, which marks the orogenic boundary between the Archean Superior Structural Province and the much younger Grenville Province to the southeast, is one of the major tectonic features of the Canadian Shield. Within Canada, it is approximately 1900 km in length extending from the north shore of Lake Huron across Ontario and Quebec to Labrador. In 1986, a major coincident onship near‐vertical reflection and onshore wide‐angle reflection/refraction experiment (GLIMPCE–Great Lakes International Multidisciplinary Program on Crustal Evolution) was conducted along a series of lines across the Great lakes. One of the lines, line J, ran across Georgian Bay and Lake Huron for a distance of 350 km and crossed the Grenville Front Tectonic Zone (GFTZ). The seismic signals from the air gun array source were well recorded by the onshore stations up to distances of 250 km with a seismic trace spacing of 50–62.5 m. The GFTZ had a profound effect on the nature of the reflector patterns observed on the onshore seismic sections. Data recorded by the stations on the east end of the line indicate that the crustal P phases are very complex and form a “shinglelike” pattern of reflected waves. Data recorded by stations at the center and at the western end of the line show that the Pg phases are normal and lack the shinglelike appearance. This character of arrivals was also observed on the corresponding S wave sections. A combined P and S wave forward modeling analysis shows that the GFTZ is composed of bands of reflectors dipping at angles of 20°–35° extending to the lower crust. These reflectors were also well imaged on the coincident near‐vertical reflection data. Reflectors under the Britt domain to the east of the GFTZ have a shallower dip than those along the zone. The structure of the crust under the Manitoulin terrane to the west of the GFTZ is laterally homogeneous with a major intracrustal reflector at a depth of 17–20 km below the surface. Poisson's ratio is slightly higher to the east of the Grenville Front compared to the region to the west. The travel times of the PmP signals indicate that the Moho may be deeper under the GFTZ than under the surrounding regions. Our results give added support to tectonic theories that the Grenville Front owes its origin to a continental collision process.

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An efficient method for sending a large Seismic section from a mainframe computer to a dot matrix printer located at a remote site

Cited by 2 publications

References 5 publications

Crustal structure of the Kapuskasing uplift from Lithoprobe Near‐vertical/wide‐angle seismic reflection data

Crustal structure of the Kapuskasing uplift from Lithoprobe Near‐vertical/wide‐angle seismic reflection data

The Grenville Front Tectonic Zone: Results from the 1986 Great Lakes Onshore Seismic Wide‐Angle Reflection and Refraction Experiment

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