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Hearst Group

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Journal Article
Journal: Economic Geology
Published: 01 November 2002
Economic Geology (2002) 97 (7): 1577–1606.
... Mountain, Stobie, and Copper Cliff Formations, May Township volcanic rocks, and minor synvolcanic mafic intrusions (~2490–2450 Ma); (3) Matachewan (2473 Ma) and Hearst (2446 Ma) mafic dike swarms ( Heaman, 1997 ); and (4) granitic intrusions within the Elliot Lake Group and the Superior province (~2450...
FIGURES | View All (11)
Series: Economic Geology Monograph Series
Published: 01 January 1999
DOI: 10.5382/Mono.10.21
EISBN: 9781629490052
... component. The residues and leachates of whole-rock samples from leaching experiments were analyzed for their Pb and Nd isotope compositions. When grouped into cogenetic suites by area, these data plot as regression lines with younger ages at ∼2.54 to 2.53 Ga and ∼2.47 to 2.46 Ga. These younger regression...
Journal Article
Published: 01 December 1984
Canadian Journal of Earth Sciences (1984) 21 (12): 1499–1506.
... the KSZ.Paleomagnetic and structural data from the Hearst dikes are consistent with the regional westward tilting of the crust near the southern KSZ as first proposed in 1983 by Percival and Card. Des dykes de direction prédominante nord et nord-ouest (appelés ici le groupe de dykes de Hearst) à l'ouest de la zone...
Journal Article
Published: 04 June 2014
Canadian Journal of Earth Sciences (2014) 51 (7): 715–729.
... in the deeper portion of the SIC. It may have developed during the modification of the initial geometry of the SIC by either a post-SIC thick-skinned basement shortening event, or by a compressive event that puts the tholeiitic basalts of the Elliot Lake Group against the SIC during the Penokean orogeny...
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Journal Article
Published: 01 September 2006
Bulletin of the Seismological Society of America (2006) 96 (4B): S239–S249.
... serious hazards on faults such as the Hayward fault ( Lienkaemper et al. , 2001 ; Simpson et al. , 2001 ) and other creeping faults in the San Francisco Bay area, California ( Galehouse and Lienkaemper, 2003 ; Working Group on California Earthquake Probabilities, 2003 ). The M 6.0 earthquake...
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Journal Article
Journal: Interpretation
Published: 22 April 2015
Interpretation (2015) 3 (2): SL63–SL81.
... a thick pile of sedimentary rocks of the Whitewater Group. A better understanding of the subsurface geology at depth using new 3D modeling and inversion codes will further assist in the prediction of preexisting structures that might act as controls or traps for mineralization, thereby defining deeper...
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Journal Article
Published: 27 January 2005
Canadian Journal of Earth Sciences (2005) 42 (1): 1–9.
... of the Sudbury Structure were undertaken as a consequence of a Lithoprobe transect, summarized by Boerner et al. ( 1994 ) and accompanying papers. The broad conclusions from magnetic and gravity data (e.g., Hearst et al. 1994 and McGrath and Broome 1994 , respectively) are that the LGC occurs as a south...
FIGURES
Journal Article
Published: 27 January 2004
Canadian Journal of Earth Sciences (2004) 41 (1): 63–72.
... Hill Formation commonly shows profound structural attenuation. The underlying upper Belt Missoula Group rocks are commonly missing or occur as detached slabs overlying older Belt rocks. Early Tertiary plutonic rocks, which clearly intrude Mesoproterozoic Belt Supergroup and Phanerozoic...
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Journal Article
Published: 28 October 2022
Canadian Journal of Earth Sciences (2023) 60 (7): 974–988.
... as a southeast-dipping parallel-sided sheet has been provided by numerous potential field models ( Morris and Hearst 1993 ; Olaniyan et al. 2014 ). Morrison (1984) compared three attributes of Lunar impact craters with features mapped at the Sudbury Impact crater: (1) a polygonal plan outline...
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Journal Article
Published: 02 April 2000
Canadian Journal of Earth Sciences (2000) 37 (2-3): 477–501.
... ( Milkereit and the Sudbury Working Group 1992 ; Wu et al. 1995 ). Two additional highresolution seismic profiles were surveyed in 1993 (43 and 44, Fig.  3 ) to delineate the three-dimensional structure of the deformed South Range. Seismic reflection data from line 1 (Fig.  3 ) were acquired by INCO...
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Journal Article
Published: 01 April 1994
Bulletin of the Seismological Society of America (1994) 84 (2): 343–349.
... . McKague H. L. Hearst J. R. (1991) . U4av site characteristics report, Lawrence Livermore National Laboratory , Livermore, California , internal document CP 91-45 , 10 May . Mueller...
Journal Article
Published: 01 September 2001
Petroleum Geoscience (2001) 7 (3): 315–320.
... and, in particular, are functions of porosity ( Hearst et al. 2000 ). In general, zones of low porosity coincide with zones of high sonic velocity and high density, and vice versa. These expected log responses are clearly seen in Figures 3 and 4 in which the lithologies colour coded in the left-hand track were...
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Journal Article
Published: 01 October 1946
Bulletin of the Seismological Society of America (1946) 36 (4): 323–325.
... the degree of M.S., and was awarded a Hearst fellowship at the Lick Observa- tory, where he worked chiefly on variable stars. He served as Instructor in Astronomy at the University of Michigan, 1893-1895, and then spent a year in Europe, studying at the universities of Berlin and Munich, and returned...
Journal Article
Journal: Geophysics
Published: 01 January 2004
Geophysics (2004) 69 (1): 64–77.
... the propagation velocity in the borehole was greater than that in the formation (e.g., an air-filled borehole in the unsaturated zone), only a guided wave propagated along the borehole. As the frequency decreased, both the phase and the group velocities of the guided wave asymptotically approached the phase...
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Journal Article
Published: 01 July 1951
Bulletin of the Seismological Society of America (1951) 41 (3): 257–259.
..., Patrick A., S.J School of Philosophy, Missouri Prov. Educa- tional Inst., 221 N. Grand Blvd., St. Louis 3, Mo. Koretsky, Sanford 1715 Hearst Ave., Berkeley 3, Calif. Ledig, Paul G Box 3067, Santurce 29, P.R. Marcelli, Liliana Istituto Nazionale di Geofisica, Citt~ Universi- taria, Roma, Italia. Owen...
Journal Article
Published: 30 January 2019
Seismological Research Letters (2019) 90 (2A): 563–572.
... (OMP) and the simultaneous orthogonal matching pursuit (SOMP) strategy to solve the dictionary‐learning problem and show that our results outperform the classical machine‐learning method—support vector machine (SVM, Hearst et al. , 1998 ), as well as the extensively used earthquake detection method...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 2000
AAPG Bulletin (2000) 84 (4): 489–504.
... to address most issues. In many cases, even of this group of 25, only four or five tracks may be needed in any given oil field environment or situation to answer the particular problem at hand and represent the principal variations in the data. The occurrence of overlap between minor ions is unimportant...
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Journal Article
Journal: Geophysics
Published: 12 April 2016
Geophysics (2016) 81 (3): D233–D243.
... and Geldart, 1995 ; Hearst et al., 2000 ). In this report, we use a relatively new array technique, termed wave gradiometry (WG), to estimate the slowness along the direction of the borehole using the amplitude of the wavefield and its spatial gradient ( Langston, 2007a , 2007b , 2007c ; Langston...
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Journal Article
Journal: Interpretation
Published: 02 August 2013
Interpretation (2013) 1 (1): T101–T112.
...Nasreddine Bournas; Ellen Clements; Rob Hearst Abstract Airborne electromagnetic, ground direct current and induced polarization (DCIP), and magnetotelluric (MT) surveys have extensively been used in mining exploration and more particularly for the exploration of base metal mineralization...
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Journal Article
Published: 01 April 1947
Bulletin of the Seismological Society of America (1947) 37 (2): 163–166.
...: Baltenweck, R S6minaire St-Martial, Port-au-Prince, Haiti. Clark, Edward H . . . . . . . . . . . . 410 Hearst Bldg., San Francisco 3, Calif. Fecht, A. J P. O. Box 385, Kansas City 17, Kan. Garthwaite, J. W . . . . . . . . . . . . 95 Bayo Vista Ave., Oakland 11, Calif. * Corporate membership. 166 BULLETIN...