Crustal structure and seismicity of the Havre Trough at 26°S

Details Crustal structure and seismicity of the Havre Trough at 26°S Crustal structure and seismicity of the Havre Trough at 26°S

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2549n&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2549-2552

Physics

Geophysics

3

Seismology: Oceanic Crust, Marine Geology And Geophysics: Marine Seismics, Tectonophysics: Dynamics, Seismotectonics

Scientific paper

An ocean bottom seismographic (OBS) experiment was carried out to investigate the present-day tectonics at the northern end of the Havre Trough, a backarc basin in the southwestern Pacific. Hypocenter distribution shows no seismicity within 50 km of the OBS array but two active regions outside the Trough; one is to the northeast of the array at a bathymetric high between the Lau Basin and Havre Trough; the other is to the southeast of the array beneath the landward slope of the Kermadec Trench. P wavespeed structure obtained from the refraction survey is characterized by a thinned island arc crust with a thickness of 9-10 km. Many volcanic intrusions shown in reflection profiles that support extension tectonics are covered by undisturbed sediments. These suggest little present activity related to rifting and/or spreading.

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