A5010681625- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Earthquake Detection and Analysis
- Landslides and related hazards
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Underwater Acoustics Research
- Geological and Geochemical Analysis
- Geological Studies and Exploration
- Geophysical Methods and Applications
- Ionosphere and magnetosphere dynamics
- Optical measurement and interference techniques
- Data-Driven Disease Surveillance
- Computational Physics and Python Applications
- Climate change and permafrost
- Anomaly Detection Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Lightning and Electromagnetic Phenomena
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Ultrasonics and Acoustic Wave Propagation
- Structural Health Monitoring Techniques
- Acoustic Wave Phenomena Research
- Geological and Geophysical Studies
Natural Resources Canada
2003-2020
Geological Survey of Canada
2000-2012
University of Cambridge
1997
Atomic Weapons Establishment
1997
Some of the most dramatic effects climate change have been observed in Earth's polar regions. In Greenland, ice loss from Greenland sheet has accelerated recent years [ Shepherd et al ., 2012]. Outlet glaciers are changing their behavior rapidly, with many thinning, retreating, and accelerating Joughin 2004]. The weighing on crust mantle below allowed both to rebound, resulting high rock uplift rates Bevis Changes cover meltwater production influence sea level feedbacks; they expected...
More than 100 separate incidents of interactions between aircraft and volcanic ash were documented 1973 2003. Incidents on international flight paths over remote areas have resulted in engine failures significant damage expense to commercial airlines. To protect from ash, pilots need rapid reliable notification ash‐ generating events. A global infrasound array network, consisting the International Monitoring System (IMS) other national networks, has demonstrated a capability for detection...
The Racha-Dzhava earthquake (Ms=7.0) that occurred on 1991 April 29 at 09:12:48.1 GMT in the southern border of Great Caucasus is biggest event ever recorded region, stronger than Spitak (Ms=6.9) 1988. A field expedition to epicentral area was organised and a temporary seismic network 37 stations deployed record aftershock activity. very precise image distribution obtained, showing an elongated cloud oriented N105°, with one branch trending N310° western part. southernmost part extends over...
On 9 October 2007, an unusual sequence of earthquakes began in central British Columbia about 20 km west the Nazko cone, most recent (circa 7200 yr) volcanic center Anahim belt. Within 25 hr, eight magnitude 2.3-2.9 occurred a region where no had previously been recorded. During next three weeks, more than 800 microearthquakes were located (and many detected), at depth 25-31 and within radius 5 km. After two months, almost all activity ceased. The clear P- S-wave arrivals indicated that...
Abstract The Canadian National Seismograph Network (CNSN) operated by Natural Resources Canada consists of approximately 200 stations. Data from this network are used to produce the national earthquake catalog, provide alerts in aftermath an earthquake, develop seismic hazard maps, and for research within internationally. A significant upgrade instrumentation infrastructure CNSN, which began 2014, is nearing completion. newly refurbished uniform terms with remaining single-component...
We demonstrate that PKP(DF) and PKP(BC), recorded by a network of broad‐band stations in the United Kingdom from earthquakes southwest Pacific, show considerable spatial variation amplitude frequency content. suggest strong heterogeneity apparent attenuation at base mantle related to ultra‐low‐velocity zones (ULVZ) beneath Pacific and/or possibly east Iceland may explain anomalous observations DF BC across UK. The length scale attenuating ULVZs required is similar estimated recently for ULVZ...
A spatial filter is often attached to a microphone or microbarometer in order reduce the noise caused by atmospheric turbulence. This filtering technique based on assumption that coherence length of turbulence smaller than extent filter, and so contributions from recorded at widely separated ports will tend cancel while those signal interest, which have larger dimensions be reinforced. In this paper, plane wave response for with an arbitrary arrangement open determined. It found propagation...
The potential of using infrasound to rapidly identify explosive volcanic eruptions has been discussed in the environmental acoustics and aviation safety communities for some time. ability sounds 0.01–10 Hz range propagate long distances with little attenuation suggests broad-area regional monitoring a modest number observing sites is possible. ASHE experiment tests both practical utility as regional-scale eruption detection tool, feasibility such an system provide timely operational alerts...
The ability of seismological criteria to identify earthquakes from underground explosions depends partly on the orientation earthquake source. Well-determined double-couple moment tensor solutions for a large number have been published in Harvard centroid (CMT) and United Slates Geological Survey (USGS) catalogues. Statistical analyses these catalogues indicate that distribution mechanisms is not random. T axes shows significant clustering around downward vertical, indicating larger radiate...
Abstract We describe the regular pre-COVID mode of operations for Canadian National Seismograph Network and associated monitoring, alerting, analysis earthquakes in Canada; we how current operational posture evolved discuss ways which was not suitable to respond challenges constraints COVID-19 situation Canada. find that many design operation decisions have been taken over last several decades earthquake monitoring Canada, collectively driven largely by considerations resilience...
Recent global events have renewed interest in acoustic observations of large earthquakes and associated phenomena such as landslides tsunamis. In addition, the proliferation networks atmospheric (infrasound) hydroacoustic observing systems mean that signals from are captured close to real-time more frequently with better resolution than ever before. Such data provide a useful complement traditional seismological events. this paper, recent earthquake presented. As well scientific insights...
On July 14, 2006, Tungurahua volcano in Ecuador initiated a dramatic eruptive sequence that caused the evacuation of villagers, destruction crops, and reports ash clouds above 15 km. Acoustic signals have been recorded by prototype infrasound acoustic-surveillance system (ASHE) currently operating Ecuador. The infrasonic ASHE included explosions, pyroclastic flows, sustained low frequency vibration ground. We present features different types eruption signals, discuss physics processes...