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Segmentation Of The Blanco Transform Fault Zone From Earthquake Analysis: Complex Tectonics Of An Oceanic Transform Fault, Jochen Braunmiller, John Nábělek
Segmentation Of The Blanco Transform Fault Zone From Earthquake Analysis: Complex Tectonics Of An Oceanic Transform Fault, Jochen Braunmiller, John Nábělek
School of Geosciences Faculty and Staff Publications
The Blanco Transform Fault Zone (BTFZ) forms the ∼350 km long Pacific–Juan de Fuca plate boundary between the Gorda and Juan de Fuca ridges. Nearby broadband seismic networks provide a unique framework for a detailed, long-term seismotectonic study of an entire oceanic transform fault (OTF) system. We use regional waveforms to determine 129 earthquake source parameters; combined with 28 Harvard moment tensors, they represent the largest waveform derived OTF source parameter data set. Joint epicenter determination removes the northeasterly routine location bias. Projecting seismicity onto the BTFZ, we determine along-fault seismic slip rate variations. Earthquake source parameters and morphology indicate …
Seismotectonics Of The Explorer Region, Jochen Braunmiller, John Nábělek
Seismotectonics Of The Explorer Region, Jochen Braunmiller, John Nábělek
School of Geosciences Faculty and Staff Publications
The Explorer region offshore western Canada is a tectonically complex area surrounded by the Pacific, North America, and Juan de Fuca plates. Existing tectonic models for the region differ fundamentally. Proposed plate configurations range from multiple independent plate fragments to an Explorer plate now fused to North America along the continental margin and cut by Pacific–North America transform faults in the west. We present new seismological data constraining the region's current tectonics. We use three-component regional waveforms to determine the source parameters of 84 earthquakes with magnitude greater than 4. Combined with 34 Harvard centroid moment tensor solutions, they represent …