Table Of Content

CONTENTS Tectonophysics Volume 186 Special Issue, Intraplate Deformation, Neotectonics, Seismicity, and the State of Stress in Eastern North America (edited by J.-C. Mareschal) I fa/fa nee AN i eee i i aad wk Ge Es RS ARO W 8-0 6 0 b-6 5 60 CR EOS OE EERO Eee Four seismogenic environments in eastern Canada Ce eee ee eT a eae ee daa ele 6.0 Wb. ee a bade Ohh Owe Oe eed eek ewe 3 Some seismological and geometric features of intraplate earthquakes ny 0s Ge ns Oy MUU, CI , MOD oe kc k's eo bse 4 bol'S ewe Belew bierh a ae Saieee eee see wees 19 A tectonic implication of the seismicity in the central metasedimentary belt of the Grenville Province NE Oe ee re ry eee er eee ee er ee 43 The Saguenay (Quebec) earthquake of November 25, 1988: seismologic data and geologic setting Du Berger, R., Roy, D.W. (Chicoutimi, Que., Canada), Lamontagne, M. (Ottawa, Ont., Canada), Woussen, G. (Chicoutimi, Que., Canada), North, R.G. and Wetmiller, R.J. (Ottawa, Ont., Canada) ...................005. 59 A re-examination of the seismicity of Michigan Fujita, K. (East Lansing, Mich., U.S.A.) and Sleep, N. (Stanford, Calif., U.S.A.) .........0....0.0.22. 0ce0 e.ee 75 Subsurface structure in the vicinity of an intraplate earthquake swarm, central Arkansas Schweig, E.S., Ill (Memphis, Tenn., U.S.A.), Van Arsdale, R.B. and Burroughs, R.K. (Fayetteville, Ark.,U.S.A.).... 107 Intraplate faults revealed in crystalline bedrock in the 1983 Goodnow and 1985 Ardsley epicentral areas, New York en rey Ann a cca cee sew eeC bee ee Hb ee UR RECS ECBO OOS Se Oeb ee On 115 Fold patterns, lateral ramps and seismicity in central Pennsylvania Pohn, H.A. (Reston, Va., U.S.A.) and Coleman, J.L., Jr. (Houston, Tex., U.S.A.) 2.2.0.0ee ee 133 In situ stress compared to structures in Lac du Bonnet Batholith, Manitoba, Canada Brown, A., Kamineni, D.C. and Martin, C.D. (Pinawa, Man., Canada) ............. 0.0.00. eee eee 151 The effect of stress-relief on ambient microcrack porosity in core samples from the Kent Cliffs (New York) and Moodus (Connecticut) scientific research boreholes Meglis, |.L., Engelder, T. and Graham, E.K. (University Park, Pa., U.S.A.) 2.0.0.0. 0 eee 163 A local weakening of the brittle—ductile transition can explain some intraplate seismic zones et TEER TET TET UNCKTTOETTOP ECLLT TETC RCCT eTE TT Ce 175 Correlations beteen streamflow and intraplate seismicity in the central Virginia, U.S.A., seismic zone: evidence for possible climatic controls ey eee ee Gane, CI, WU, ID Wik ccc eek eds ccecdeee eb eer ecd eseeneece ee 193 Research Papers Theory of slickenline patterns based on the velocity gradient tensor and microrotation Twiss, R.J., Protzman, G.M. and Hurst, S.D. (Davis, Calif., U.S.A.) 2.0... 200.0000 0c ee eee 215 The effect of oriented microcracks on seismic velocities in an ultramylonite Siegesmund, S. (Gottingen, F.R.G.), Kern, H. (Kiel, F.R.G.) and Volibrecht, A. (Goéttingen, F.R.G.) ............. 241 Blueschists and eclogites: a possible plate tectonic mechanism for their emplacement from the upper mantle RR FT TEE ee OCT TEE TTT CE TTC CULEC EET COUPEE CTE CTE CTy 253 Paleomagnetism and tectonics of the Jura arcuate mountain belt in France and Switzerland Getwing, A.L., Keler, P. Gre CCGer, F. CEPI, GWTUBOTUMNG) wn ccc ccc c creer sereccessroesees 269 Acadian and Alleghenian remagnetization of the Jim Pond Formation, central western Maine, northern Appalachians Lombard, A.D., van der Pluijm, B.A. and Van der Voo, R. (Ann Arbor, Mich., U.S.A.) ...................045. 279 Morphological and structural studies of the Society and Austral hotspot regions in the South Pacific Binard, N., Hékinian, R. (Plouzane, France), Cheminée, J.L. (Paris, France), Searle, R.C. (Durham, U.K.) and eee ee ere TT TOU REE eee TCR TEE Ee CT PUL TETSE TERE TO ETUC e 293 Ephemeral magma chambers in the Trinity peridotite, northern California Se ee ee ee eee eee eee ee ee ee ee ee ee 313 From transtension to transpression along the northern Caribbean plate boundary off Cuba: implications for the Recent motion of the Caribbean plate Calais, E. and Mercier de Lepinay, GB. (V@IDONNG, FANGS) 2... ccc cece eee c reece ccesseecesens 329 Crustal structure of the Mamfe basin, West Africa, based on gravity data Fairhead, J.D. (Leeds, U.K.), Okereke, C.S. (Calabar, Nigeria) and Nnange, J.M. (Yaounde, Cameroon)......... 392 The Narmada-—Son-Brahmaputra transform: a Mesozoic fracture zone in Gondwanic India Sen, N. (Ranchi, India) Gravity field deep structure of the Bangal Fan and its surrounding continental margins, northeast Indian Ocean Mukhopadhyay, M. and Krishna, M.R. (Dhanbad, India) Book Reviews Inverse Gravimetric Problems in GeoProspecting and Geodesy by D. Zidarov—G.G. Tango Carbonate Rock Depositional Models: A Microfacies Approach by A.V. Carozzi—R.G.C. Bathurst Geophysical Framework of the Continental United States by L.C. Pakiser and W.D. Mooney (Editors) —G.G. Tango Erratum