A5080562922- earthquake and tectonic studies
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- Atomic and Subatomic Physics Research
- Ancient Mediterranean Archaeology and History
- Particle physics theoretical and experimental studies
- Seismic Imaging and Inversion Techniques
- Particle Detector Development and Performance
University of British Columbia
2018-2024
Ideon Science Park
2024
Abstract We employ an automatic earthquake detection algorithm to seismic waveforms recorded between the years 2000 and 2020 in southwest British Columbia. 32,121 events which possess at least three paired P ‐ S ‐wave arrival times are located, compared 21,538 existing Geologic Survey of Canada catalog. This augmented catalog is employed for double‐difference tomography across Vancouver Island, with particular focus on Nootka Fault zone (NFZ). The NFZ a transform boundary that separates Juan...
Abstract We present new seismic tomography of the Washington forearc using a suite manually picked regional earthquake phase arrivals. The recovery similarly sampled P and S velocity permits robust calculation Poisson's ratio throughout region. seismological signature Siletzia, an accreted oceanic plateau that crops out in as Crescent Formation, is evident our models continuous high body coincides with subsurface structures estimated from potential field maps. Relocated earthquakes...
Abstract Plate motion obliquity along the dominantly transform Queen Charlotte plate boundary (QCPB) peaks offshore Haida Gwaii. To investigate effects of on deformation, we analyze continuous seismic waveforms from temporary and permanent stations 1998 to 2020 generate a catalog ∼50,000 earthquakes across We use an automated technique based auto‐regressive phase detection onset estimation obtain initial catalog, integrate existing catalogs, invert for 3D velocity structure using data best...
Abstract We investigate an isolated cluster of temporally persistent, intraslab earthquakes (ML<3.2) at >60 km depth below the Georgia Strait in southern British Columbia that is unique Cascadia and meets criteria for identification as earthquake nest. A total 129 relocated hypocenters define two northwest‐dipping structures subducting Juan de Fuca mantle within ∼30×10×10 km3 volume. Focal mechanisms 15 events represent a mix strike‐slip reverse faulting, stress regime down‐dip tension...
ABSTRACT We propose new methods for assessing temporal changes in seismic velocity using the S-wave coda repeating earthquakes and cross-correlation functions of ambient noise. For a pair waveforms representing common source–receiver path, relative change path-averaged over corresponding time interval is directly proportional to factor by which one waveform needs be stretched or compressed with respect other achieve maximum coherence. an arbitrary number waveforms, initial pair-wise stretch...
The Queen Charlotte plate boundary marks a transpressional system between the Pacific and North American plates, extending from offshore Haida Gwaii in Canada into southeastern Alaska. Using continuous seismic waveforms temporary permanent networks 1998–2020, we produced comprehensive catalog of ~50,000 earthquakes across region near Gwaii. We used an automated processing technique auto-regressive phase detection onset estimation to obtain initial catalog, integrated existing catalogs,...