The spatial seismicity of Papua New Guinea and the Solomon Islands
Titel:
The spatial seismicity of Papua New Guinea and the Solomon Islands
Auteur:
Curtis, John W.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 20 (1973) nr. 1 pagina's 1-19
Jaar:
1973
Inhoud:
The spatial distribution of earthquakes is described for the Papua New Guinea and Solomon Islands region, using data for the period 1931 to 1970. Most of the seismic activity is concentrated in a belt which follows through northern New Guinea, New Britain, Bougainville, and the Solomon Islands. Within this belt, the activity is highest from the Huon Peninsula to the southern end of Bougainville. Here, there is evidence that the earthquake foci lie in zones which dip away from the Solomon Sea, with a series of deep earthquakes occurring on the northern side of the main seismic axis. This section also marks the region of greatest apparent energy and strain release. In northern New Guinea the activity generally increases from west to east, as do the focal depths of the deepest earthquakes. Although the pattern is not clear, the earthquakes appear to lie within a zone which dips towards the northeast, although, in parts, there is also evidence that some reside in another zone which dips less steeply towards the west-southwest. Several minor belts of activity flank the major earthquake zone, the earthquakes within them being predominantly shallow in focal depth.
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