By Loren W. Kroenke, James V. Eade
The Earth technology sequence of the Circum-Pacific investment for send time used to be made on hand via Council for strength and Mineral assets (CPCEMR) the U. S. business enterprise for overseas improvement, the is designed to show the result of geologie examine in USGS, the U. S. workplace of Naval study (for HIG's and round the Pacific Basin. Topies of curiosity contain 1982 work), the Australian improvement assistance framework geology, petroleum geology, tough minerals, Bureau, the Australian Bureau of Mineral assets geothermal strength, environmental geology, volcanology, (BMR), the recent Zealand Ministry of overseas Affairs, oceanography, tectonics, geophysies, geochemistry, and the hot Zealand Departrnent of clinical and business functions of renewable power. The CPCEMR sup study (DSIR), the recent Zealand Geological Survey, ports and publishes result of clinical examine that might and the recent Zealand Oceanographic Institute (NZOI). enhance the information of power and mineral source Coordination of this system was once supplied via the U. S. strength within the circum-Pacific quarter. The Earth Sci Departrnent of country and the South Pacific utilized Geo ence sequence is particularly designed to submit papers that technological know-how fee (SOPAC, previously the United comprise new info and new maps, file on CPCEMR Nations-sponsored Committee for the Coordination of backed symposia and workshops, and describe the Joint Prospecting for Mineral assets in South Pacific result of onshore and marine geological and geophysieal Offshore parts CCOP/SOP AC) in Fiji. Over one hundred fifty scien explorations.
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Extra info for Basin Formation, Ridge Crest Processes, and Metallogenesis in the North Fiji Basin
ACKNOWLEDGMENTS The authors wish to thank Loren Kroenke for providing bathymetric data for the central North Fiji Basin. Tom Brocher, Roger Bowman, and Muawia Barazangi provided useful comments on an earlier version of the manuscript. E. Farkas, J. Chatelain, and C. Bass assisted in preparation of the figures, and the manuscript was typed by T. Alt. S. Office of Foreign Disaster Assistance Grant No. PDC-0000-G-SS-2134-00. This is Cornell contribution No. 825. , M. Barazangi, and B. Isacks, 1972, P and S travel times in the Tonga-Fiji region: A zone of low velocity in the uppermost mantle behind the Tonga island arc: Journal of Geophysical Research, v.
1981). The new mechanism (event no. 8 on Figure 4) was obtained using P-wave first motions and S-wave polarization directions read on long-period seismograms from the WorIdwide Standard Seismograph Network. The mechanism parameters are summarized in Table 1, and a lower hemisphere stereograph projection of the new mechanism is given in Figure 5. Several of the published mechanisms have been discarded due to poor readings or to poor constraint on the mechanisms' nodal planes. In an area with relatively few focal mechanisms, a single errant solution can seriously obstruct any reliable tectonic analysis.
Lower hemisphere projection of the new focal mechanism for the earthquake of 1 January 1972. Mechanism parameters are given in Table 1. Large open and filled circles represent c1ear dilatational and compressional first motions, respectively. Uncertain first motions are shown as small circles. Large crosses indicate P-wave arrivals that are judged to be near a nodal plane. Arrows with filled and open heads represent c1ear and uncertain S-wave polarization directions, respectively. X-marks on the nodal planes indicate the poles to the opposite plane.