Abstract
The Gulf Islands region of southwest British Columbia is an ideal location to study, in detail, slab seismicity of the subducting Juan de Fuca plate. Here, there is abundant slab seismicity, a relatively dense network of seismograph stations to obtain accurate hypocenters and some recently deployed three-component broadband stations to constrain the velocity structure. We have relocated slab seismicity near 50 - 60 km depth in the Gulf Island region using a "double difference" earthquake relocation algorithm designed to provide high-resolution relative hypocenter locations over large distances. The precise relative locations obtained for an initial test set of 27 deep earthquakes in a narrow corridor near Saturna Island, B.C., indicates that most of the slab seismicity here is in a three to four kilometer-thick region dipping at 20° to the northeast. There is some suggestion of a deeper parallel band of seismicity (7 - 9 km) below the top of the upper band that may be located in the upper mantle of the Juan de Fuca plate.
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