Acoustic emissions from a 2120 cubic in air-gun array were recorded through a towed hydrophone assembly during an oil industry 2-D seismic survey off the West Wales Coast of the British Isles. Recorded seismic pulses were sampled, calibrated, and analyzed post-survey to investigate power levels of the pulses in the band 200 Hz-22 kHz at 750-m, 1-km, 2.2-km, and 8-km range from source. At 750-m ...

A 3D Finite-element Investigation into Optimal Survey Parameters and Direct Imaging for Marine Controlled-Source Electromagnetic Surveys. (May 2006) Ryan Lau, B.S., University of Waterloo, Canada Chair of Advisory Committee: Dr. Mark E. Everett Relatively little is known about marine controlled-source electromagnetic surveys (MCSEM) used to detect hydrocarbon reservoirs. Typical MCSEM require t...

Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Introduction: The internal structure of the Moon is essential information that infers the origin and evolution of the Moon. Many attempts have been made fo...

Time-lapse monitoring is a powerful tool for tracking subsurface changes resulting from fluid migration. Conventional timelapse monitoring can be done by observing differences between two seismic surveys over the surveillance period. Along with the changes in the subsurface, differences in the two seismic surveys are also caused by variations in the near-surface overburden and acquisition discr...

sarcheshmeh copper mine, with the final reserves of 828 million tons of sulfur ore and average grade of 0.74%, is known to be the largest open pit of iran and most probably the second largest copper mine in the world. this mine is located in the seismotectonic zone of central-iran, and 23 km away from the 150 km long rafsanjan active fault.in this study the vulnerability of the west wall of the...

S U M M A R Y We use a numerical simulation to investigate the response of sediment-filled valleys to P-SV seismic excitation. The calculation is carried out using the discrete wavenumber-boundary integral equation method. We study in particular the case of explosion sources located within a basin or in its vicinity. We show that large amplification or defocusing effects are related to the sour...

We discuss the use of reverse time migration (RTM) with dense seismic networks for the detection and location of sources of atmospheric infrasound. Seismometers measure the response of the Earth's surface to infrasound through acoustic-to-seismic coupling. RTM has recently been applied to data from the USArray network to create a catalogue of infrasonic sources in the western US. Specifically, ...

a r t i c l e i n f o The purpose of this study is to analytically predict and to experimentally investigate the seismic response of adjacent filled parallel rock fractures with dissimilar properties (e.g., fracture thickness and stiffness). The time-domain recursive method is extended to predict that a P-wave propagates normally across the filled parallel fractures using the specific stiffness...