projects. Brief reports on each of these projects are presented.j; Major Descriptors: *ENIWETOK -- RESEARCH PROGRAMS Descriptors: ALGAE; AQUATIC ORGANISMS; BEHAVIOR; CORALS; ECOLOGY; FISHES; PHOTOSYNTHESIS; POPULATION DYNAMICS; REEF; RODENTS Broader Terms: ANIMALS; AQUATIC ORGANISMS; CHEMICAL REACTIONS; CNIDARIA; GEOLOGIC STRUCTURES; ISLANDS; MAMMALS; MARSHALL ISLANDS; MICRONESIA; OCEANIA; PHOTOCHEMICAL REACTIONS; PLANTS; SYNTHESIS; VERTEBRATES Subject Categories: (-1989) -- Environment, 510100 10/5/907 Author(s): Terrestrial -- Behavioral Biology 550100 00617742 -- Environment, 520100* + Aquatic -- Basic Studies -- -- Basic Studies -- (-1989y (Item 607 from file: 103) ERA-05-021122; EDB-80-057266 Vizgirda, J.; Ahrens, T.d. Title: Shock effects in carbonate minerals and rocks. Final report, January~30 June 1978 Corporate Source: California Inst. of Tech., Pasadena (USA). Seismological Lab. Publication Date: 30 Jun 1978 p 24 1 Report Number(s): AD-A-071372 Contract Number (DOE): DNAQ01-76-C-0218 Document Type: Report Language: English Journal Announcement: EDB7911 Availability: NTIS PC A02/MF A0Ql. Subfile: ERA (Energy Research Abstracts); NTS (NTIS). Country of Origin: United States Country of Publication: United States Abstract: The ESR spectra of Mn(++) in naturally and laboratory shocked calcite crystals and coral core samples were studied and variations in several spectral parameters were found to be correlative with shock pressure. The amount of splitting in the central transition hyperfine component peaks was observed to decrease in the upper levels of the Cactus Crater core and in core samples shocked in the laboratory to progressively higher pressures. A comparison of the splitting amplitude between the two types of samples allows pressure assignments to the Cactus core of 3.3 GPa at 8m. + or - 5m. and 2.0 GPa at 13m. + or - 5m. Unshocked coral core samples showed no splitting amplitude variation with depth. Results from coral subjected to a long duration pressure pulse in the Miser’s Bluff TNT experiment are generally inconsistent. Laboratory shocked single crystal calcite showed similar decreases in hyperfine peak splitting but at pressure levels three times greater than those producing comparable coral sample spectra. The decrease in peak splitting is interpreted to reflect small increases in cation~anion distances produced by mechanical energy input during the shock process. Another parameter, the non-central to central transition peak amplitude, is observed to decrease with increasing pressure in spectra of single crystal calcite, and may provide a means of empirically correlating very low (less than 4.5 GPa) shock pressure levels in calcite.; Major Descriptors: *CRATERING EXPLOSIONS ~- SHOCK WAVES; *ROCKS -- SEISMIC Subject Categories: 450200* -- Military Technology, Defense -- Nuclear Explosions & Explosives 10/5/908 00612818 (Item 608 from file: 103) INS-80-006900; EDB-80-052341 Weaponry, & National Title: Spatial relationship of 1l-m equatorial spread F irregularities and 900! 0 8 EFFECTS Descriptors: CALCITE; CARBONATES; ELECTRON SPIN RESONANCE; ENIWETOK; HIGH PRESSURE; HYPERFINE STRUCTURE; MONOCRYSTALS; NUCLEAR EXPLOSIONS; TNT Broader Terms: ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; CHEMICAL EXPLOSIVES; CRYSTALS; EXPLOSIONS; EXPLOSIVES; ISLANDS; MAGNETIC RESONANCE; MARSHALL ISLANDS; MICRONESIA; NITRO COMPOUNDS; OCEANIA; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; RESONANCE as! eto