CANOE: A Broadband Array in Northwestern Canada

CANOE: A Broadband Array in Northwestern Canada Topographic map of northwestern Canada, showing the CANOE deployment (red triangles) and its relationship to major geologic structures in the region. The array is laid out in three arms, two trending SE-NW that follow the Alaska Highway, and one trending N-NE that follows the Liard and McKenzie Highways. The array is anchored by 3 permanent stations of the CNSN (grey triangles). This geometry will allow us to image the lithospheric expression of the cordillera-to-craton transition, as well as probe the deep signature of the large lithospheric faults and shear zones. It also will provide unprecedented sampling of the core mantle boundary region beneath the central Pacific near Hawaii.

The Canadian Northwest Experiment (CANOE) is a nearly sixty broadband-instrument array extending from the Slave Craton in the Canadian NWT, across the Canadian Rockies in northern British Columbia and Yukon and south to Edmonton Alberta where the FLED (Florida to Edmonton) PASSCAL array terminated (Figure 1). The array crosses 4 Ga of geologic time and a series of compressive orogens undisrupted by later periods of extension or extensive hotspot volcanism. Coupled with excellent shallow structural control from Lithoprobe active-source transects, CANOE offers an unparalleled window into deep continental lithosphere structural expression and history. The array also offers excellent deep-mantle sampling of the central Pacific and Hawaii. A subset of the array was installed in May, 2003. The remaining two-thirds of the array were deployed in May and June of 2004 and will remain until October, 2005. Array endpoints are anchored by permanent stations of the CNSN that are available through the IRIS DMC; typical station spacing within the array is less than 50 km. Data are recorded continuously at 20 samples per second on a mixture of Guralp 3T, 3ESP and 40T instruments. Instruments for CANOE were provided by PASSCAL/IRIS. The members of CANOE wish to thank the PASSCAL Team for training, extensive field assistance and critical logistical support.

Michael Bostock, A. Langlois, I. Al-Khoubbi, Adam Baig, Jean-Philippe Mercier, T. Nicholson,
Jounada Oueity • University of British Columbia; James Gaherty, Charles Wilson • Lamont Doherty Earth Observatory of Columbia University; Edward Garnero, Sean Ford, Nicholas Schmerr, Michael Thorne, Jesse Yoburn • Arizona State University; Jason Revenaugh, Anna Courtier • University of Minnesota; Megan Avants • University of California, Santa Cruz; Noel Barstow • IRIS-PASSCAL Instrument Center, New Mexico Tech


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