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. company for overseas improvement, the is designed to exhibit the result of geologie examine in USGS, the U. S. place of work of Naval study (for HIG's and round the Pacific Basin. Topies of curiosity comprise 1982 work), the Australian improvement assistance framework geology, petroleum geology, demanding minerals, Bureau, the Australian Bureau of Mineral assets geothermal strength, environmental geology, volcanology, (BMR), the hot Zealand Ministry of international Affairs, oceanography, tectonics, geophysies, geochemistry, and the hot Zealand Departrnent of medical and commercial purposes of renewable power. The CPCEMR sup learn (DSIR), the hot Zealand Geological Survey, ports and publishes result of medical study that would and the hot Zealand Oceanographic Institute (NZOI). develop the data of strength and mineral source Coordination of this system was once supplied by way of the U. S. capability within the circum-Pacific sector. The Earth Sci Departrnent of kingdom and the South Pacific utilized Geo ence sequence is particularly designed to submit papers that technology fee (SOPAC, previously the United contain new facts and new maps, record 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 components CCOP/SOP AC) in Fiji. Over one hundred fifty scien explorations.
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Additional info for Basin Formation, Ridge Crest Processes, and Metallogenesis in the North Fiji Basin
Mechanism parameters are given in Table 1. Strike of preferred plane ofvertical dip-slip mechanisms is shown, with sense ofmotion given by U (up) and D (down). Single preferred plane or both planes of strike-slip mechanisms are shown with arrows indicating sense of motion. Insets show stress axes for areas of uniform stress distribution: P-axes = filled circles; T-axes = open circles; B-axes = X's. Earthquake locations as in Figure 2. tripIe junetion proposed by Kroenke et al. (this volume), and to the northeast -trendingspreading ridge proposed by Halunen (1979).
Gutenberg and Richter (1954) first noted the existence of these isolated shallow earthquakes outside the main Tonga and New Hebrides seismic zones, particularly northeast and west of Fiji. Sykes (1966), using computer-relocated epicenters, was able to resolve several discrete zones of seismicity between the Tonga and New Hebrides arcs: one extending from the northern end of the Tonga Trench toward Fiji, a second within the Lau Basin, and a third extending northeastward from the southern New Hebrides into the North Fiji Basin.
X T w ·l~ • • iI'! • • •• )(71' 0 00 I 29 0 0 0 0 *• s tensional stresses within the basin. However, our observations corroborate Eguchi's (1984) finding that the fault planes of these events are oriented obliquely to the proposed strike ofboth ofthe north-trending spreading centers proposed in this portion of the basin (Chase, 1971; Malahoff et al. , 1982a; Brocher and Holmes, 1985). The earthquakes have a common southeasttrending fault plane accommodating dextral shear and a northwest-trending plane accommodating sinistral shear.