prevention, detection, and restoration; a conference and exposition. 8, 1991. p. 221-232.

OP-61. R. A. Wharton, Jr.*, C. P. McKay*, G. D. Clow, D. T. Andersen*, G. M. Simmons, Jr.* and F. G. Love*. Changes in ice cover thickness and lake level of Lake Hoare, Antarctica; implications for local climatic change. Journal of Geophysical Research, C, Oceans. v. 97, no. 3, March 15, 1992. p. 35033513.

ABSTRACTS

Abstracts are condensed but informative summaries of presentations made at meetings of scientific and professional organizations. Typically they summarize the principal conclusions of an author's current work but contain little supporting data. Non-Geological Survey personnel who share authorship in abstracts with U.S. Geological Survey personnel are indicated by an asterisk (*) immediately following the name. These publications are not available from the U.S. Geological Survey.

OP-62. Alex Acosta, Janet Barrett* and C. D. Condit*. Digitizing geologic maps; a means for rapid derivation and publication [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 108.

OP-63. J. N. Aleinikoff, T. E. Moore, S. M. Karl and J. T. Dillon. ALASKA. Pb isotopic ratios in late Proterozoic and Devonian granite rocks of the Brooks Range, Alaska (abstr.) Eos, Transactions, American Geophysical Union, in AGU 1991 fall meeting. v. 72, no. 44, October 29, 1991. p. 299-300.

OP-64. S. T. Algermissen, E. V. Leyendecker, D. M. Perkins, P. C. Thenhaus, B. K. Bender, R. L. Wheeler and S. L. Hanson. New generation probabilistic ground motion hazard maps for the United States [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1439.

OP-65. L. R. Alldredge. On regional geomagnetic charts [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 667.

OP-66. C. N. Alpers and D. K. Nordstrom. CALIFORNIA. Mass balance of metal transport during weathering of massive sulfide ores at Iron Mtn., West Shasta mining district, California [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 102.

OP-67. Antonio Arribas, Jr.*, C. G. Cunningham, J. J. Rytuba, R. O. Rye, Antonio Arribas, Sr.*, R. M. Tosdal* and M. Η. Podwysocki*. The Rodalquilar epithermal gold-alunite deposit, SE Spain [abstr.], in Mineral deposits of Europe. Cardiff: Univ. Wales, Coll. Cardiff, 1989. p. 10.

OP-68. M. A. Arthur*, R. L. Larson* and W. E. Dean. The Cretaceous mantle-crust-climate connection [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1660.

OP-69. M. Attrep, Jr.*, C. J. Orth*, L. R. Quintana*, C. S. Shoemaker, E. M. Shoemaker and S. R. Taylor*. Chemical fractionation of siderophile elements in impactites from Australian

meteorite craters [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. Μ. Boyce). 4300, June 1991. p. 375-376.

OP-70. Atilla Aydin*, A. M. Johnson* and R. W. Fleming. CALIFORNIA. Field evidence for right-lateral/reverse tectonic surface rupture along the San Andreas/Sargent fault systems associated with the 1989 Loma Prieta earthquake [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1460.

OP-71. P. M. Barlow. MASSACHUSETTS. Relation between water-quality conditions and simulated sources of water to publicsupply wells, Cape Cod, Massachusetts [abstr.] Eos, Transactions, American Geophysical Union, in AGU-MSA 1991 spring meeting. v. 72, no. 17, April 23, 1991. p. 140.

OP-72. R. M. Batson. Base materials for geological mapping of the planets [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 109.

OP-73. R. M. Batson, E. M. Eliason, L. A. Soderblom, Kathleen Edwards and S. S. Wu. CD-ROM publication of the Mars digital cartographic data base [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 512-513.

OP-74. R. M. Batson and J. L. Inge. A new catalog of planetary maps [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyсе). 4300, June 1991. p. 516.

OP-75. R. M. Batson, J. L. Inge and H. F. Morgan. Planetary atlases [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 511.

OP-76. R. M. Batson, R. C. Kozak and N. K. Isbell. Digital solar system geology [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 515.

OP-77. R. M. Batson, A. S. McEwen and S. S. Wu. A new edition of the Mars 1:5,000,000 map series [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 510.

OP-78. R. M. Batson, H. F. Morgan and Robert Sucharski. Venus mapping [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 483-489.

OP-79. R. M. Batson and J. F. Russell. Naming the newly found landforms on Venus [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 490-491.

OP-80. R. M. Batson and P. K. Thomas. Mars high-resolution mapping [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 509.

OP-81. J. M. Been, S. L. Szarzi and G. M. Reimer. Radon as a geologic mapping tool [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 143.

OP-82. Β. Κ. Bender. Reliability of estimates of maximum earthquake magnitudes based on observed maxima [abstr.] Seismological Research Letters, in 83rd annual meeting of the Seismological Society of America. v. 59, no. 1, March 1988. p. 15.

OP-83. A. M. Berarducci and L. W. Pankratz. Long and short term stability of DIM and DIDD magnetometer systems [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 675.

OP-84. Κ. Κ. Beratan*, R. G. Blom*, R. E. Crippen* and J. E. Nielson. CALIFORNIA, ARIZONA. Use of Landsat thematic mapper images in regional correlation of syntectonic strata, Colorado River extensional corridor, California and Arizona [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 108.

OP-85. J. D. Bicknell, L. G. Wennerberg, R. V. Sharp* and D. Garcia*. Implications of local aftershock recordings for source processes of the M 7.8 Philippine earthquake of 16 July 1990 [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1442.

OP-86. Bin Xia* and D. G. Howell. The Himalayan composite terrane [abstr.) Serie Comunicaciones Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, in Vth international Circumpacific terrane conference; expanded abstracts. (Estanislao Godoy, editor and others). 42, 1991. p. 17-19.

OP-87. M. C. Blake, Jr. and A. S. Jayko. Ophiolites; keys to unroofing of high P/T metamorphic rocks [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1709.

OP-88. John Boatwright and J. B. Fletcher. A general inversion of body wave spectra for source, site, and propagation characteristics [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. р. 1439.

OP-89. L. W. Braile*, G. R. Keller*, A. Githui*, W. D. Mooney, K. H. Olsen*, S. Harder*, Claus Prodehl*, J. Mechie*, J. Ritter*, R. Stellrecht*, R. Vees*, D. J. Gajewski*, M. A. Khan*, P. K. Maguire*, W. Kirk*, A. E. Mussett*, E. Dindi*, S. J. Gaciri*, J. P. Patel*, D. Riaroh*, B. Jacob*, Hans Thybo*, M. Demartin*, J. Diaz* and R. Bowman*. Preliminary new models of the crustal structure beneath the Kenya Rift from the KRISP 90 seismic refraction profiles [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1450.

OP-90. T. J. Bralower* and W. V. Sliter. Episodes of regional and oceanwide anoxia/dysaerobia in the Aptian-Albian [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1660.

OP-91. K. S. Breckenridge and R. O. Burford. CALIFORNIA. Changes in fault slip near San Juan Bautista, California before the

October 17, 1989 Loma Prieta earthquake; a possible precursor? [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1461.

OP-92. C. G. Bufe, S. C. Jaumé*, S. P. Nishenko, L. R. Sykes* and D. J. Varnes. ALASKA. Accelerating moment release in the Alaska subduction zone; precursor to a great thrust earthquake? [abstr.) Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1451-1452.

OP-93. T. D. Bullen, A. F. White, M. L. Peterson, A. Blum and J. W. Harden. CALIFORNIA. Isotopic composition of exchangeable Sr in variably weathered granitic Alluvial soils, Central California [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1719.

OP-94. Roland Bürgmann*, Paul Segall*, L. Liu*, Michael Lisowski, W. H. Prescott and J. P. Svarc. CALIFORNIA. The search for postseismic strain diffusion northwest of the October 17th, 1989 Loma Prieta rupture zone using repeated GPS measurements [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. р. 1455.

OP-95. R. C. Burruss, T. G. Ging and C. L. Knight*. Multichannel Raman microprobe observations of 180/160 in calcite; feasibility of 8180 O measurements with 3 micron spatial resolution [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1655.

OP-96. W. M. Calvin, R. N. Clark and T. V. King. New spectral observations of Callisto and leading/trailing hemisphere distinctions [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 294-295.

OP-97. W. M. Calvin and T. V. King. Spectral evidence for carbonates on Mars; hydrous carbonates [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 244-245.

OP-98. K. W. Campbell. Near-source attenuation of strong-motion parameters; an update [abstr.] Seismological Research Letters, in 83rd annual meeting of the Seismological Society of America. v. 59, no. 1, March 1988. p. 12.

OP-99. W. H. Campbell. A comparison of equivalent external Sq currents above six continental areas [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 726.

OP-100. M. H. Carr. Water on Mars; clue to accretional history [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 187-190.

OP-101. T. J. Casadevall, C. A. Neal, R. G. McGimsey, M. P. Doukas and C. A. Gardner. ALASKA. Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions [abstr.) Eos, Transactions, American prevention, detection, and restoration; a conference and exposition. 8, 1991. p. 221-232.

OP-61. R. A. Wharton, Jr.*, C. P. McKay*, G. D. Clow, D. T. Andersen*, G. M. Simmons, Jr.* and F. G. Love*. Changes in ice cover thickness and lake level of Lake Hoare, Antarctica; implications for local climatic change. Journal of Geophysical Research, C, Oceans. v. 97, no. 3, March 15, 1992. p. 35033513.

ABSTRACTS

Abstracts are condensed but informative summaries of presentations made at meetings of scientific and professional organizations. Typically they summarize the principal conclusions of an author's current work but contain little supporting data. Non-Geological Survey personnel who share authorship in abstracts with U.S. Geological Survey personnel are indicated by an asterisk (*) immediately following the name. These publications are not available from the U.S. Geological Survey.

OP-62. Alex Acosta, Janet Barrett* and C. D. Condit*. Digitizing geologic maps; a means for rapid derivation and publication [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 108.

OP-63. J. N. Aleinikoff, T. E. Moore, S. M. Karl and J. T. Dillon. ALASKA. Pb isotopic ratios in late Proterozoic and Devonian granite rocks of the Brooks Range, Alaska [abstr.) Eos, Transactions, American Geophysical Union, in AGU 1991 fall meeting. v. 72, no. 44, October 29, 1991. p. 299-300.

OP-64. S. T. Algermissen, E. V. Leyendecker, D. M. Perkins, P. C. Thenhaus, B. K. Bender, R. L. Wheeler and S. L. Hanson. New generation probabilistic ground motion hazard maps for the United States [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1439.

OP-65. L. R. Alldredge. On regional geomagnetic charts [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 667.

OP-66. C. N. Alpers and D. K. Nordstrom. CALIFORNIA. Mass balance of metal transport during weathering of massive sulfide ores at Iron Mtn., West Shasta mining district, California [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 102.

OP-67. Antonio Arribas, Jr.*, C. G. Cunningham, J. J. Rytuba, R. O. Rye, Antonio Arribas, Sr.*, R. M. Tosdal* and M. Η. Podwysocki*. The Rodalquilar epithermal gold-alunite deposit, SE Spain [abstr.], in Mineral deposits of Europe. Cardiff: Univ. Wales, Coll. Cardiff, 1989. p. 10.

OP-68. M. A. Arthur*, R. L. Larson* and W. E. Dean. The Cretaceous mantle-crust-climate connection [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1660.

OP-69. M. Attrep, Jr.*, C. J. Orth*, L. R. Quintana*, C. S. Shoemaker, E. M. Shoemaker and S. R. Taylor*. Chemical fractionation of siderophile elements in impactites from Australian

meteorite craters [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. М. Boyce). 4300, June 1991. p. 375-376.

OP-70. Atilla Aydin*, A. M. Johnson* and R. W. Fleming. CALIFORNIA. Field evidence for right-lateral/reverse tectonic surface rupture along the San Andreas/Sargent fault systems associated with the 1989 Loma Prieta earthquake [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1460.

OP-71. P. M. Barlow. MASSACHUSETTS. Relation between water-quality conditions and simulated sources of water to publicsupply wells, Cape Cod, Massachusetts [abstr.] Eos, Transactions, American Geophysical Union, in AGU-MSA 1991 spring meeting. v. 72, no. 17, April 23, 1991. p. 140.

OP-72. R. M. Batson. Base materials for geological mapping of the planets [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 109.

OP-73. R. M. Batson, E. M. Eliason, L. A. Soderblom, Kathleen Edwards and S. S. Wu. CD-ROM publication of the Mars digital cartographic data base [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 512-513.

OP-74. R. M. Batson and J. L. Inge. A new catalog of planetary maps [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 516.

OP-75. R. M. Batson, J. L. Inge and H. F. Morgan. Planetary atlases [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 511.

OP-76. R. M. Batson, R. C. Kozak and N. K. Isbell. Digital solar system geology [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 515.

OP-77. R. M. Batson, A. S. McEwen and S. S. Wu. A new edition of the Mars 1:5,000,000 map series [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 510.

OP-78. R. M. Batson, H. F. Morgan and Robert Sucharski. Venus mapping [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 483-489.

OP-79. R. M. Batson and J. F. Russell. Naming the newly found landforms on Venus [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 490-491.

OP-80. R. M. Batson and P. K. Thomas. Mars high-resolution mapping [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 509.

OP-81. J. M. Been, S. L. Szarzi and G. M. Reimer. Radon as a geologic mapping tool [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 143.

OP-82. Β. Κ. Bender. Reliability of estimates of maximum earthquake magnitudes based on observed maxima [abstr.] Seismological Research Letters, in 83rd annual meeting of the Seismological Society of America. v. 59, no. 1, March 1988. p. 15.

OP-83. A. M. Berarducci and L. W. Pankratz. Long and short term stability of DIM and DIDD magnetometer systems [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 675.

OP-84. Κ. Κ. Beratan*, R. G. Blom*, R. E. Crippen* and J. E. Nielson. CALIFORNIA, ARIZONA. Use of Landsat thematic mapper images in regional correlation of syntectonic strata, Colorado River extensional corridor, California and Arizona [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 108.

OP-85. J. D. Bicknell, L. G. Wennerberg, R. V. Sharp* and D. Garcia*. Implications of local aftershock recordings for source processes of the M 7.8 Philippine earthquake of 16 July 1990 [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1442.

OP-86. Bin Xia* and D. G. Howell. The Himalayan composite terrane [abstr.) Serie Comunicaciones Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, in Vth international Circumpacific terrane conference; expanded abstracts. (Estanislao Godoy, editor and others). 42, 1991. p. 17-19.

OP-87. M. C. Blake, Jr. and A. S. Jayko. Ophiolites; keys to unroofing of high P/T metamorphic rocks [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1709.

OP-88. John Boatwright and J. B. Fletcher. A general inversion of body wave spectra for source, site, and propagation characteristics [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. р. 1439.

OP-89. L. W. Braile*, G. R. Keller*, A. Githui*, W. D. Mooney, K. H. Olsen*, S. Harder*, Claus Prodehl*, J. Mechie*, J. Ritter*, R. Stellrecht*, R. Vees*, D. J. Gajewski*, M. Α. Khan*, P. K. Maguire*, W. Kirk*, A. E. Mussett*, E. Dindi*, S. J. Gaciri*, J. P. Patel*, D. Riaroh*, B. Jacob*, Hans Thybo*, M. Demartin*, J. Diaz* and R. Bowman*. Preliminary new models of the crustal structure beneath the Kenya Rift from the KRISP 90 seismic refraction profiles [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1450.

OP-90. T. J. Bralower* and W. V. Sliter. Episodes of regional and oceanwide anoxia/dysaerobia in the Aptian-Albian [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1660.

OP-91. K. S. Breckenridge and R. O. Burford. CALIFORNIA. Changes in fault slip near San Juan Bautista, California before the

October 17, 1989 Loma Prieta earthquake; a possible precursor? [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1461.

OP-92. C. G. Bufe, S. C. Jaumé*, S. P. Nishenko, L. R. Sykes* and D. J. Varnes. ALASKA. Accelerating moment release in the Alaska subduction zone; precursor to a great thrust earthquake? [abstr.) Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1451-1452.

OP-93. T. D. Bullen, A. F. White, M. L. Peterson, A. Blum and J. W. Harden. CALIFORNIA. Isotopic composition of exchangeable Sr in variably weathered granitic Alluvial soils, Central California [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1719.

OP-94. Roland Bürgmann*, Paul Segall*, L. Liu*, Michael Lisowski, W. H. Prescott and J. P. Svarc. CALIFORNIA. The search for postseismic strain diffusion northwest of the October 17th, 1989 Loma Prieta rupture zone using repeated GPS measurements [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. р. 1455.

OP-95. R. C. Burruss, T. G. Ging and C. L. Knight*. Multichannel Raman microprobe observations of 180/160 in calcite; feasibility of 8180 measurements with 3 micron spatial resolution [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1655.

OP-96. W. M. Calvin, R. N. Clark and T. V. King. New spectral observations of Callisto and leading/trailing hemisphere distinctions [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 294-295.

OP-97. W. M. Calvin and T. V. King. Spectral evidence for carbonates on Mars; hydrous carbonates [abstr.) NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 244-245.

OP-98. K. W. Campbell. Near-source attenuation of strong-motion parameters; an update [abstr.] Seismological Research Letters, in 83rd annual meeting of the Seismological Society of America. v. 59, no. 1, March 1988. p. 12.

OP-99. W. H. Campbell. A comparison of equivalent external Sq currents above six continental areas [abstr.] International Union of Geodesy and Geophysics, General Assembly, in International Union of Geodesy and Geophysics (IUGG), XIX general assembly; abstracts-Union Géodésique et Géophysique Internationale (UGGI); XIX assemblée générale; résumés. 19, Vol. 2, 1987. p. 726.

OP-100. Μ. H. Carr. Water on Mars; clue to accretional history [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 187-190.

OP-101. T. J. Casadevall, C. A. Neal, R. G. McGimsey, M. P. Doukas and C. A. Gardner. ALASKA. Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1702.

OP-102. J. E. Case, W. C. Day, H. C. Halls* and V. W. Chandler*. MINNESOTA. Early Proterozoic dike swarm in the Roseau and International Falls quadrangles, Minnesota, U.S.A., and Ontario, Canada [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1645.

OP-103. S. W. Cates, C. L. Aiken*, D. G. Ziegler* and W. D. Gosnold*. NORTH DAKOTA. High-accuracy gravity data used for rapid delineation of small, shallow aquifers in west-central North Dakota [abstr.] Eos, Transactions, American Geophysical Union, in AGU-MSA 1991 spring meeting. v. 72, no. 17, April 23, 1991. p. 132.

OP-104. С. В. Cecil and F. T. Dulong. Coastal lowland soils of equatorial Indonesia as modern analogues for Pennsylvanian underclays [abstr.] Program and Abstracts - Annual Clay Minerals Conference, in Clay Minerals Society, 27th annual meeting; program and abstracts. (J. F. Burst, chairperson and others). 27, October 1990. p. 32.

OP-105. M. G. Chapman and K. L. Tanaka. Geologic mapping of lower Mangala Valles, Mars; evidence of flooding, sapping, debris flow, and volcanism [abstr.) Abstracts with Programs Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 108.

OP-106. M. G. Chapman and K. L. Tanaka. Channeling episodes of Kasei Valles, Mars, and the nature of ridged plains materials [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. М. Boyce). 4300, June 1991. p. 138-139.

OP-107. I-Ming Chou and D. P. Moecher. A new method for control and measurement of N2 and NH3 fugacities in hydrothermal experiments [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 155.

OP-108. B. A. Chouet, R. A. Page, J. N. Davies*, J. A. Power, J. C. Lahr, D. H. Harlow and C. D. Stephens. ALASKA. Forecasting the December 14, 1989 and January 2, 1990 eruptions at Redoubt Volcano, Alaska [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1701.

OP-109. K. F. Clark*, Fidel Castaneda Arriaga and Jose Payan Molinar*. Mineralization controls at Cusihuiriachic, Chihuahua, Mexico [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. р. 150.

OP-110. G. D. Clow and R. M. Haberle*. Free convection in the Martian atmosphere [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 199-200.

OP-111. G. D. Clow and R. M. Haberle*. Characteristics of the Martian atmospheric surface layer [abstr.] NASA Technical Mem

orandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 201-202.

OP-112. Stuart Crampin*, D. C. Booth*, Russ Evans*, Sheila Peacock* and J. B. Fletcher. Response to comments by Aster et al. about shear-wave splitting observed by Crampin et al. and Peacock et al. [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1443.

OP-113. C. G. Cunningham, Antonio Arribas, Jr.* and J. J. Rytuba. Mineralized and unmineralized calderas in the Cabo de Gata volcanic field, SE Spain [abstr.], in Mineral deposits of Europe. Cardiff: Univ. Wales, Coll. Cardiff, 1989. p. 38.

OP-114. G. F. Davidson and L. W. Snee. Resetting of the hornblende K-Ar isotopic system during mylonitization; implications for direct dating of ductile shear zones [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1662.

OP-115. J. N. Davies* and T. P. Miller. ALASKA. Monitoring and forecasting the 1989-1990 eruption of Redoubt Volcano and the role of the Alaska Volcano Observatory in communicating warnings to the public [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1700.

OP-116. J. N. Davies*, T. P. Miller, J. A. Power and R. B. Forbes*. ALASKA. The Alaska Volcano Observatory; a multisite, multiagency consortium for volcano monitoring and research [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1709.

OP-117. P. A. Davis, K. L. Tanaka, M. P. Golombek* and J. B. Plescia*. Interactions of tectonic, igneous, and hydraulic processes in the North Tharsis region of Mars [abstr.] NASA Technical Memorandum, in Reports of planetary geology and geophysics program; 1990. (J. M. Boyce). 4300, June 1991. p. 73-74.

OP-118. W. C. Day, E. B. Kisvarsanyi*, L. M. Nuelle*, Μ. Α. Marikos* and C. M. Seeger*. MISSOURI. New data on the origin of the Pea Ridge iron-apatite deposit, Southeast Missouri; implications for olympic dam-type deposits [abstr.] Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting. (R. F. Dymek, chairperson and others). v. 21, no. 6, 1989. p. 132.

OP-119. P. T. Delaney, A. T. Okamura, Asta Miklius and M. K. Sako. HAWAII. Present-day deformation rates at Kilauea Volcano, Hawaii [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1711.

OP-120. J. H. Dietrich. CALIFORNIA. 1990 working group study on probabilities of earthquakes in the San Francisco Bay region, California [abstr.] Eos, Transactions, American Geophysical Union, in AGU 1990 fall meeting. v. 71, no. 43, October 23, 1990. p. 1447.

OP-121. Craig Dietsch*, R. E. Zartman, L. M. Kwak and J. N. Aleinikoff. U-Pb zircon age constraints from deeply exposed polymetamorphic thrust sheets, southwestern New England Appalachians [abstr.) Abstracts with Programs - Geological Society of America, in Geological Society of America, 1989 annual meeting.