Research Article| January 16, 2019 Seismic Event and Phase Detection Using Time–Frequency Representation Convolutional Neural Networks Ramin M. H. Dokht; Dokht aPacific Geoscience Centre, Natural Resources Canada, Geological Survey of 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2, ramin.mohammadhosseinidokht@canada.ca Search for other works by this author on: GSW Google Scholar Honn Kao; Kao Ryan Visser; Visser Brindley Smith Seismological Letters (2019) 90 (2A): 481–490....

Abstract Crustal low‐velocity zones (LVZs) have been reported in active orogens such as the Himalayas and Andes but rarely stable cratonic regions. In this study, we provide compelling evidence for a significant midcrustal LVZ beneath eastern‐central Alberta, an integral part of Precambrian Canadian Shield covered by thick Phanerozoic sedimentary deposits. This 200 km wide, over 10 is well resolved shear velocity inversions using P‐to‐S receiver functions from more than 4600 earthquakes. It...

Abstract Imaging of tectonically complex regions can greatly benefit from dense network data and resolution enhancement techniques. Conventional methods in the analysis SS precursors stack waveforms to obtain an average discontinuity depth, but smearing due large Fresnel zones degrade fine‐scale topography on discontinuity. To provide a partial solution, we introduce depth migration algorithm based common scattering point method while considering nonspecular diffractions mantle transition...

Abstract Recent studies confirm that the distribution of injection-induced earthquakes (IIE) can be related to both natural (e.g., tectonic, geological, and hydrological) settings operational details. However, relative importance factors with respect ones has not been fully understood for western Canada sedimentary basin. In this study, we train eXtreme Gradient Boosting (XGBoost) machine-learning algorithm comprehensively evaluate six geological seven industrial suspected correlated IIE in...

Seismic discontinuities are fundamental to the understanding of mantle composition and dynamics. Their depths impedance contrasts generally determined using secondary phases such as SS precursors P-to-S converted waves. However, analysing interpreting these weak signals often suffer from incomplete data coverage, high noise levels interfering seismic arrivals, especially near tectonically complex regions subduction zones. To overcome pitfalls, we adopt a singular spectrum analysis (SSA)...

Abstract Mining activities are well known for being able to induce local seismicity but have not yet been shown cause earthquakes over large distances. We analyze a particular group of seismic events recorded from 2014 2016 in north‐central British Columbia (BC) that appear be triggered by the at Mount Milligan Mine. The spatial distribution studied follows NW‐SE linear trend, with distances up approximately 100 km mining site. To distinguish blasts blasting‐related and natural events, we...

Abstract The Snowbird Tectonic Zone (STZ) in southwestern Canada and the Great Falls (GFTZ) northern Montana are two structural lineaments with major implications for formation evolution of western North American craton. In this study, we examine origins these proposed Proterozoic sutures using broadband seismic data from Alberta USArray stations. We find substantial spatial variations crustal structure thickness across both STZ GFTZ based on an integrated analysis P ‐to‐ S receiver...

Due to uneven earthquake source and receiver distributions, our abilities isolate weak signals from interfering phases reconstruct missing data are fundamental improving the resolution of seismic imaging techniques. In this study, we introduce a modified frequency–wavenumber (fk) domain based approach using 'Projection Onto Convex Sets' (POCS) algorithm. POCS takes advantage sparsity dominating energies phase arrivals in fk domain, which enables an effective detection reconstruction signals....

Abstract The observations of spatiotemporal distribution seismicity in western Canada indicate that the occurrence earthquakes is tied to hydraulic fracturing operations and disposal coproduced wastewater. In this study, we investigate temporal changes frequency‐magnitude distributions for multiple clusters induced events regions where level background low. are clustered into six major groups using density‐based spatial soft clustering algorithms based on their epicenters. Each cluster...

ABSTRACT In this study, we develop an integrated framework for simultaneous detection of seismic events and picking phase arrival times, association, locating earthquakes. The proposed model combines the accuracy convolutional neural networks classification tasks efficiency waveform-based algorithms identifying coherent arrivals. We find that our strongly dominates classic techniques, especially in small magnitude apply to one month continuous data recorded western Canada monitoring activity...

Abstract Secondary converted waves from receiver functions are highly sensitive to physical properties below the Earth's surface. When modeled properly, waveforms of offer direct constraints on impedance contrast, depth, and P‐to‐S velocity ratio pertaining sedimentary, crustal mantle interfaces. In this study we introduce a nonlinear waveform inversion algorithm that matches first 5 s recorded in Alberta Basin within Western Canada Sedimentary (WCSB). Our searches for optimal thickness...

The burgeoning development of hydraulic fracturing (HF) for unconventional resource extraction has been paralleled by a rise in injection-induced earthquakes (IIEs), posing significant seismic hazards. A critical challenge mitigating these hazards is the accurate assessment seismogenic potential and earthquake productivity individual HF pads. We addresses this analyzing over 35,000 Southern Montney Play (SMP), Western Canada, from 2014 to 2022, associating them with 357   employed...

Abstract The SS precursors have been extensively utilized in mapping the mantle transition zone (MTZ). However, their applications are often challenged by weak phases that arise from small impedance contrasts of discontinuities, noise contamination, and localized thermal/compositional heterogeneities. We develop a new data processing workflow for more reliable MTZ imaging adopting recently proposed robust damped rank‐reduction (RDRR) method exploration seismology. This exploits signal...

Abstract The damage potential of induced earthquakes associated with fluid injection is a major concern in hydrocarbon resource development. An important source data for the assessment macroseismic intensity perceived by people and structures. In Western Canada Sedimentary Basin (WCSB) where occurrence seismicity mostly related to oil gas activities, collection incomplete. this study, we present comprehensive dataset gathered BC Oil Gas Commission period 2016–2020. We assign intensities...